internal MeshNode(int i, int fi, g3.Frame3f f, g3.Index3i neighbors_index, g3.Index3i vertex_index)
{
frame = f;
this.neighbors_index = neighbors_index;
this.vertex_index = vertex_index;
meshIndex = fi;
index = i;
}
// (sequentially) find each triangle that path point lies in, and insert a vertex for
// that point into mesh.
void insert_corners(HashSet <int> MeshVertsOnCurve)
{
PrimalQuery2d query = new PrimalQuery2d(PointF);
if (UseTriSpatial)
{
int count = Mesh.TriangleCount + Curve.VertexCount;
int bins = 32;
if (count < 25)
{
bins = 8;
}
else if (count < 100)
{
bins = 16;
}
AxisAlignedBox3d bounds3 = Mesh.CachedBounds;
AxisAlignedBox2d bounds2 = new AxisAlignedBox2d(bounds3.Min.xy, bounds3.Max.xy);
triSpatial = new TriangleBinsGrid2d(bounds2, bins);
foreach (int tid in Mesh.TriangleIndices())
{
spatial_add_triangle(tid);
}
}
Func <int, Vector2d, bool> inTriangleF = (tid, pos) => {
Index3i tv = Mesh.GetTriangle(tid);
int query_result = query.ToTriangleUnsigned(pos, tv.a, tv.b, tv.c);
return(query_result == -1 || query_result == 0);
};
CurveVertices = new int[Curve.VertexCount];
for (int i = 0; i < Curve.VertexCount; ++i)
{
Vector2d vInsert = Curve[i];
bool inserted = false;
// find the triangle that contains this curve point
int contain_tid = DMesh3.InvalidID;
if (triSpatial != null)
{
contain_tid = triSpatial.FindContainingTriangle(vInsert, inTriangleF);
}
else
{
foreach (int tid in Mesh.TriangleIndices())
{
Index3i tv = Mesh.GetTriangle(tid);
// [RMS] using unsigned query here because we do not need to care about tri CW/CCW orientation
// (right? otherwise we have to explicitly invert mesh. Nothing else we do depends on tri orientation)
//int query_result = query.ToTriangle(vInsert, tv.a, tv.b, tv.c);
int query_result = query.ToTriangleUnsigned(vInsert, tv.a, tv.b, tv.c);
if (query_result == -1 || query_result == 0)
{
contain_tid = tid;
break;
}
}
}
// if we found one, insert the point via face-poke or edge-split,
// unless it is exactly at existing vertex, in which case we can re-use it
if (contain_tid != DMesh3.InvalidID)
{
Index3i tv = Mesh.GetTriangle(contain_tid);
Vector3d bary = MathUtil.BarycentricCoords(vInsert, PointF(tv.a), PointF(tv.b), PointF(tv.c));
// SpatialEpsilon is our zero-tolerance, so merge if we are closer than that
bool is_existing_v;
int vid = insert_corner_from_bary(i, contain_tid, bary, 0.01, 100 * SpatialEpsilon, out is_existing_v);
if (vid > 0)
{
CurveVertices[i] = vid;
if (is_existing_v)
{
MeshVertsOnCurve.Add(vid);
}
inserted = true;
}
}
// if we did not find containing triangle,
// try matching with any existing vertices.
// This can happen if curve point is right on mesh border...
if (inserted == false)
{
foreach (int vid in Mesh.VertexIndices())
{
Vector2d v = PointF(vid);
if (vInsert.Distance(v) < SpatialEpsilon)
{
CurveVertices[i] = vid;
MeshVertsOnCurve.Add(vid);
inserted = true;
}
}
}
// TODO: also case where curve point is right on mesh border edge,
// and so it ends up being outside all triangles?
if (inserted == false)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corners: curve vertex "
+ i.ToString() + " is not inside or on any mesh triangle!");
}
}
}
public static bool RandomizeMesh(g3.DMesh3 mesh, out g3.DMesh3 outputMesh, double amount, double moveTries)
{
System.Collections.Generic.SortedDictionary <int, MeshNode> faces = new System.Collections.Generic.SortedDictionary <int, MeshNode>();
int index = 0;
foreach (var meshFaceIndex in mesh.TriangleIndices())
{
var frame = mesh.GetTriFrame(meshFaceIndex);
g3.Index3i neighbors = mesh.GetTriNeighbourTris(meshFaceIndex);
g3.Index3i vertex_index = mesh.GetTriangle(meshFaceIndex);
faces.Add(meshFaceIndex, new MeshNode(index++, meshFaceIndex, frame, neighbors, vertex_index));
}
foreach (var f in faces)
{
f.Value.neighbors.Clear();
f.Value.neighbors.Capacity = 3;
for (int i = 0; i < 3; ++i)
{
int fn = f.Value.neighbors_index[i];
if (fn >= 0)
{
f.Value.neighbors.Add(faces[fn]);
}
}
if (f.Value.neighbors.Count < 3)
{
f.Value.locked = true;
foreach (var n in f.Value.neighbors)
{
n.locked = true;
}
}
}
DMesh3 projectMeshCopy = new DMesh3(mesh);
outputMesh = new DMesh3(mesh);
if (faces.Count == 0)
{
return(false);
}
DMeshAABBTree3 treeProject = new DMeshAABBTree3(projectMeshCopy);
treeProject.Build();
Random r = new Random();
bool result = false;
//for (int i = 0; i < moveTries; i++)
//{
double faceArea = 0;
foreach (var f in faces)
{
faceArea += f.Value.TriangleArea(outputMesh);
}
faceArea /= faces.Count;
foreach (var f in faces)
{
result |= f.Value.Randomize(outputMesh, treeProject, r, amount, moveTries, faceArea);
}
double newFaceArea = 0;
foreach (var f in faces)
{
newFaceArea += f.Value.TriangleArea(outputMesh);
}
newFaceArea /= faces.Count;
return(result);
}
//public static void VoronoiMesh(List<g3.PolyLine3d> mesh, out List<g3.Line3d> listLines, out List<g3.PolyLine3d> listPolylines)
//{
// System.Collections.Generic.SortedDictionary<int, MeshNode> faces = new System.Collections.Generic.SortedDictionary<int, MeshNode>();
// int index = 0;
// foreach (var meshFaceIndex in mesh.TriangleIndices())
// {
// var frame = mesh.GetTriFrame(meshFaceIndex);
// g3.Index3i neighbors = mesh.GetTriNeighbourTris(meshFaceIndex);
// g3.Index3i vertex_index = mesh.GetTriangle(meshFaceIndex);
// faces.Add(meshFaceIndex, new MeshNode(index++, meshFaceIndex, frame, neighbors, vertex_index));
// }
// foreach (var f in faces)
// {
// f.Value.neighbors.Clear();
// f.Value.neighbors.Capacity = 3;
// for (int i = 0; i < 3; ++i)
// {
// int fn = f.Value.neighbors_index[i];
// if (fn >= 0)
// f.Value.neighbors.Add(faces[fn]);
// }
// if (f.Value.neighbors.Count < 3)
// {
// f.Value.locked = true;
// foreach (var n in f.Value.neighbors)
// n.locked = true;
// }
// }
// outputMesh = new g3.DMesh3(g3.MeshComponents.None);
// listLines = new List<g3.Line3d>();
// listPolylines = new List<g3.PolyLine3d>();
// foreach (var f in faces)
// {
// outputMesh.AppendVertex(f.Value.frame.Origin);
// }
// HashSet<int> processedPoints = new HashSet<int>();
// foreach (var f in faces)
// {
// for (int i = 0; i < 3; i++)
// {
// List<int> outputLine = new List<int>();
// if (processedPoints.Contains(f.Value.vertex_index[i]))
// continue;
// int checkVertex = f.Value.vertex_index[i];
// MeshNode currentFaces = f.Value;
// MeshNode prevFace = null;
// bool fullLoop = false;
// while (true)
// {
// for (int j = 0; j < currentFaces.neighbors.Count; j++)
// {
// var neighbor = currentFaces.neighbors[j];
// if (neighbor.UsesVertex(checkVertex))
// {
// if (neighbor == prevFace)
// continue;
// if (neighbor == f.Value)
// {
// fullLoop = true;
// break; // Found full loop
// }
// outputLine.Add(neighbor.index);
// prevFace = currentFaces;
// currentFaces = neighbor;
// j = -1;
// }
// }
// break;
// }
// if (fullLoop)
// {
// processedPoints.Add(checkVertex);
// var polyline = new g3.PolyLine3d();
// if (outputLine.Count > 2)
// {
// g3.Vector3d centerPoint = f.Value.frame.Origin;
// foreach (var p in outputLine)
// centerPoint += outputMesh.GetVertex(p);
// centerPoint /= (outputLine.Count + 1);
// int center = outputMesh.AppendVertex(centerPoint);
// var pS = outputMesh.GetVertex(f.Value.index);
// var p0 = outputMesh.GetVertex(outputLine[0]);
// var pE = outputMesh.GetVertex(outputLine[outputLine.Count - 1]);
// var normal = mesh.GetTriNormal(f.Value.meshIndex);
// polyline.AppendVertex(pS);
// polyline.AppendVertex(p0);
// listLines.Add(new g3.Line3d(pS, p0 - pS));
// var n = MathUtil.Normal(centerPoint, pS, p0);
// bool reverseTri = n.Dot(normal) < 0;
// if (!reverseTri)
// outputMesh.AppendTriangle(center, f.Value.index, outputLine[0]);
// else
// outputMesh.AppendTriangle(center, outputLine[0], f.Value.index);
// for (int j = 0; j < outputLine.Count - 1; j++)
// {
// var p1 = outputMesh.GetVertex(outputLine[j]);
// var p2 = outputMesh.GetVertex(outputLine[j + 1]);
// listLines.Add(new g3.Line3d(p1, p2 - p1));
// polyline.AppendVertex(p2);
// if (!reverseTri)
// outputMesh.AppendTriangle(center, outputLine[j], outputLine[j + 1]);
// else
// outputMesh.AppendTriangle(center, outputLine[j + 1], outputLine[j]);
// }
// polyline.AppendVertex(pS);
// listLines.Add(new g3.Line3d(pE, pS - pE));
// listPolylines.Add(polyline);
// if (!reverseTri)
// outputMesh.AppendTriangle(center, outputLine[outputLine.Count - 1], f.Value.index);
// else
// outputMesh.AppendTriangle(center, f.Value.index, outputLine[outputLine.Count - 1]);
// }
// }
// }
// }
//}
public static void VoronoiMesh(g3.DMesh3 mesh, out g3.DMesh3 outputMesh, out List <g3.Line3d> listLines, out List <g3.PolyLine3d> listPolylines)
{
System.Collections.Generic.SortedDictionary <int, MeshNode> faces = new System.Collections.Generic.SortedDictionary <int, MeshNode>();
int index = 0;
foreach (var meshFaceIndex in mesh.TriangleIndices())
{
var frame = mesh.GetTriFrame(meshFaceIndex);
g3.Index3i neighbors = mesh.GetTriNeighbourTris(meshFaceIndex);
g3.Index3i vertex_index = mesh.GetTriangle(meshFaceIndex);
faces.Add(meshFaceIndex, new MeshNode(index++, meshFaceIndex, frame, neighbors, vertex_index));
}
foreach (var f in faces)
{
f.Value.neighbors.Clear();
f.Value.neighbors.Capacity = 3;
for (int i = 0; i < 3; ++i)
{
int fn = f.Value.neighbors_index[i];
if (fn >= 0)
{
f.Value.neighbors.Add(faces[fn]);
}
}
if (f.Value.neighbors.Count < 3)
{
f.Value.locked = true;
foreach (var n in f.Value.neighbors)
{
n.locked = true;
}
}
}
outputMesh = new g3.DMesh3(g3.MeshComponents.None);
listLines = new List <g3.Line3d>();
listPolylines = new List <g3.PolyLine3d>();
foreach (var f in faces)
{
outputMesh.AppendVertex(f.Value.frame.Origin);
}
HashSet <int> processedPoints = new HashSet <int>();
foreach (var f in faces)
{
for (int i = 0; i < 3; i++)
{
List <int> outputLine = new List <int>();
if (processedPoints.Contains(f.Value.vertex_index[i]))
{
continue;
}
int checkVertex = f.Value.vertex_index[i];
MeshNode currentFaces = f.Value;
MeshNode prevFace = null;
bool fullLoop = false;
while (true)
{
for (int j = 0; j < currentFaces.neighbors.Count; j++)
{
var neighbor = currentFaces.neighbors[j];
if (neighbor.UsesVertex(checkVertex))
{
if (neighbor == prevFace)
{
continue;
}
if (neighbor == f.Value)
{
fullLoop = true;
break; // Found full loop
}
outputLine.Add(neighbor.index);
prevFace = currentFaces;
currentFaces = neighbor;
j = -1;
}
}
break;
}
if (fullLoop)
{
processedPoints.Add(checkVertex);
var polyline = new g3.PolyLine3d();
if (outputLine.Count > 2)
{
g3.Vector3d centerPoint = f.Value.frame.Origin;
foreach (var p in outputLine)
{
centerPoint += outputMesh.GetVertex(p);
}
centerPoint /= (outputLine.Count + 1);
int center = outputMesh.AppendVertex(centerPoint);
var pS = outputMesh.GetVertex(f.Value.index);
var p0 = outputMesh.GetVertex(outputLine[0]);
var pE = outputMesh.GetVertex(outputLine[outputLine.Count - 1]);
var normal = mesh.GetTriNormal(f.Value.meshIndex);
polyline.AppendVertex(pS);
polyline.AppendVertex(p0);
listLines.Add(new g3.Line3d(pS, p0 - pS));
var n = MathUtil.Normal(centerPoint, pS, p0);
bool reverseTri = n.Dot(normal) < 0;
if (!reverseTri)
{
outputMesh.AppendTriangle(center, f.Value.index, outputLine[0]);
}
else
{
outputMesh.AppendTriangle(center, outputLine[0], f.Value.index);
}
for (int j = 0; j < outputLine.Count - 1; j++)
{
var p1 = outputMesh.GetVertex(outputLine[j]);
var p2 = outputMesh.GetVertex(outputLine[j + 1]);
listLines.Add(new g3.Line3d(p1, p2 - p1));
polyline.AppendVertex(p2);
if (!reverseTri)
{
outputMesh.AppendTriangle(center, outputLine[j], outputLine[j + 1]);
}
else
{
outputMesh.AppendTriangle(center, outputLine[j + 1], outputLine[j]);
}
}
polyline.AppendVertex(pS);
listLines.Add(new g3.Line3d(pE, pS - pE));
listPolylines.Add(polyline);
if (!reverseTri)
{
outputMesh.AppendTriangle(center, outputLine[outputLine.Count - 1], f.Value.index);
}
else
{
outputMesh.AppendTriangle(center, f.Value.index, outputLine[outputLine.Count - 1]);
}
}
}
}
}
}
/// <summary>
/// Disconnect the given triangles from their neighbours, by duplicating "boundary" vertices, ie
/// vertices on edges for which one triangle is in-set and the other is not.
/// If bComputeEdgePairs is true, we return list of old/new edge pairs (useful for stitching)
/// [TODO] currently boundary-edge behaviour is to *not* duplicate boundary verts
/// </summary>
public bool SeparateTriangles(IEnumerable <int> triangles, bool bComputeEdgePairs, out List <Index2i> EdgePairs)
{
HashSet <int> in_set = new HashSet <int>(triangles);
Dictionary <int, int> VertexMap = new Dictionary <int, int>();
EdgePairs = null;
HashSet <int> edges = null;
List <Index2i> OldEdgeVerts = null;
if (bComputeEdgePairs)
{
EdgePairs = new List <Index2i>();
edges = new HashSet <int>();
OldEdgeVerts = new List <Index2i>();
}
// duplicate vertices on edges that are on boundary of triangles roi
foreach (int tid in triangles)
{
Index3i te = Mesh.GetTriEdges(tid);
for (int j = 0; j < 3; ++j)
{
Index2i et = Mesh.GetEdgeT(te[j]);
// [TODO] what about behavior where we want to also duplicate boundary verts??
if (et.b == DMesh3.InvalidID || (et.a == tid && in_set.Contains(et.b)) || (et.b == tid && in_set.Contains(et.a)))
{
te[j] = -1;
}
}
for (int j = 0; j < 3; ++j)
{
if (te[j] == -1)
{
continue;
}
Index2i ev = Mesh.GetEdgeV(te[j]);
if (VertexMap.ContainsKey(ev.a) == false)
{
VertexMap[ev.a] = Mesh.AppendVertex(Mesh, ev.a);
}
if (VertexMap.ContainsKey(ev.b) == false)
{
VertexMap[ev.b] = Mesh.AppendVertex(Mesh, ev.b);
}
if (bComputeEdgePairs && edges.Contains(te[j]) == false)
{
edges.Add(te[j]);
OldEdgeVerts.Add(ev);
EdgePairs.Add(new Index2i(te[j], -1));
}
}
}
// update triangles
foreach (int tid in triangles)
{
Index3i tv = Mesh.GetTriangle(tid);
Index3i tv_new = tv;
for (int j = 0; j < 3; ++j)
{
int newv;
if (VertexMap.TryGetValue(tv[j], out newv))
{
tv_new[j] = newv;
}
}
if (tv_new != tv)
{
Mesh.SetTriangle(tid, tv_new);
}
}
if (bComputeEdgePairs)
{
for (int k = 0; k < EdgePairs.Count; ++k)
{
Index2i old_ev = OldEdgeVerts[k];
int new_a = VertexMap[old_ev.a];
int new_b = VertexMap[old_ev.b];
int new_eid = Mesh.FindEdge(new_a, new_b);
Util.gDevAssert(new_eid != DMesh3.InvalidID);
EdgePairs[k] = new Index2i(EdgePairs[k].a, new_eid);
}
}
return(true);
}
public void FindConnectedT()
{
Components = new List <Component>();
int NT = Mesh.MaxTriangleID;
// [TODO] could use Euler formula to determine if mesh is closed genus-0...
Func <int, bool> filter_func = (i) => { return(Mesh.IsTriangle(i)); };
if (FilterF != null)
{
filter_func = (i) => { return(Mesh.IsTriangle(i) && FilterF(i)); }
}
;
// initial active set contains all valid triangles
byte[] active = new byte[Mesh.MaxTriangleID];
Interval1i activeRange = Interval1i.Empty;
if (FilterSet != null)
{
for (int i = 0; i < NT; ++i)
{
active[i] = 255;
}
foreach (int tid in FilterSet)
{
bool bValid = filter_func(tid);
if (bValid)
{
active[tid] = 0;
activeRange.Contain(tid);
}
}
}
else
{
for (int i = 0; i < NT; ++i)
{
bool bValid = filter_func(i);
if (bValid)
{
active[i] = 0;
activeRange.Contain(i);
}
else
{
active[i] = 255;
}
}
}
// temporary buffers
List <int> queue = new List <int>(NT / 10);
List <int> cur_comp = new List <int>(NT / 10);
// keep finding valid seed triangles and growing connected components
// until we are done
IEnumerable <int> range = (FilterSet != null) ? FilterSet : activeRange;
foreach (int i in range)
{
//for ( int i = 0; i < NT; ++i ) {
if (active[i] == 255)
{
continue;
}
int seed_t = i;
if (SeedFilterF != null && SeedFilterF(seed_t) == false)
{
continue;
}
queue.Add(seed_t);
active[seed_t] = 1; // in queue
while (queue.Count > 0)
{
int cur_t = queue[queue.Count - 1];
queue.RemoveAt(queue.Count - 1);
active[cur_t] = 2; // tri has been processed
cur_comp.Add(cur_t);
Index3i nbrs = Mesh.GetTriNeighbourTris(cur_t);
for (int j = 0; j < 3; ++j)
{
int nbr_t = nbrs[j];
if (nbr_t != DMesh3.InvalidID && active[nbr_t] == 0)
{
queue.Add(nbr_t);
active[nbr_t] = 1; // in queue
}
}
}
Component comp = new Component()
{
Indices = cur_comp.ToArray()
};
Components.Add(comp);
// remove tris in this component from active set
for (int j = 0; j < comp.Indices.Length; ++j)
{
active[comp.Indices[j]] = 255;
}
cur_comp.Clear();
queue.Clear();
}
}
public static bool is_ordered(int a, int b, ref Index3i tri_verts)
{
return((tri_verts.a == a && tri_verts.b == b) ||
(tri_verts.b == a && tri_verts.c == b) ||
(tri_verts.c == a && tri_verts.a == b));
}
public static int find_tri_ordered_edge(int a, int b, Index3i tri_verts)
{
return(find_tri_ordered_edge(a, b, ref tri_verts));
}
// Remove a tID from the mesh. Also removes any unreferenced edges after tri is removed.
// If bRemoveIsolatedVertices is false, then if you remove all tris from a vert, that vert is also removed.
// If bPreserveManifold, we check that you will not create a bowtie vertex (and return false).
// If this check is not done, you have to make sure you don't create a bowtie, because other
// code assumes we don't have bowties, and will not handle it properly
public bool RemoveTriangle(int tID, bool bRemoveIsolatedVertices = true, bool bPreserveManifold = true)
{
if (!triangles_refcount.isValid(tID))
{
Debug.Assert(false);
return(false);
}
Index3i tv = GetTriangle(tID);
Index3i te = GetTriEdges(tID);
// if any tri vtx is a boundary vtx connected to two interior edges, then
// we cannot remove this triangle because it would create a bowtie vertex!
// (that vtx already has 2 boundary edges, and we would add two more)
if (bPreserveManifold)
{
for (int j = 0; j < 3; ++j)
{
if (vertex_is_boundary(tv[j]))
{
if (edge_is_boundary(te[j]) == false && edge_is_boundary(te[(j + 2) % 3]) == false)
{
return(false);
}
}
}
}
// Remove triangle from its edges. if edge has no triangles left,
// then it is removed.
for (int j = 0; j < 3; ++j)
{
int eid = te[j];
replace_edge_triangle(eid, tID, InvalidID);
if (edges[4 * eid + 2] == InvalidID)
{
int a = edges[4 * eid];
List <int> edges_a = vertex_edges[a];
edges_a.Remove(eid);
int b = edges[4 * eid + 1];
List <int> edges_b = vertex_edges[b];
edges_b.Remove(eid);
edges_refcount.decrement(eid);
}
}
// free this triangle
triangles_refcount.decrement(tID);
Debug.Assert(triangles_refcount.isValid(tID) == false);
// Decrement vertex refcounts. If any hit 1 and we got remove-isolated flag,
// we need to remove that vertex
for (int j = 0; j < 3; ++j)
{
int vid = tv[j];
vertices_refcount.decrement(vid);
if (bRemoveIsolatedVertices && vertices_refcount.refCount(vid) == 1)
{
vertices_refcount.decrement(vid);
Debug.Assert(vertices_refcount.isValid(vid) == false);
vertex_edges[vid] = null;
}
}
updateTimeStamp();
return(true);
}
public MeshResult CollapseEdge(int vKeep, int vRemove, out EdgeCollapseInfo collapse)
{
collapse = new EdgeCollapseInfo();
if (IsVertex(vKeep) == false || IsVertex(vRemove) == false)
{
return(MeshResult.Failed_NotAnEdge);
}
int b = vKeep; // renaming for sanity. We remove a and keep b
int a = vRemove;
List <int> edges_b = vertex_edges[b];
int eab = find_edge(a, b);
if (eab == InvalidID)
{
return(MeshResult.Failed_NotAnEdge);
}
int t0 = edges[4 * eab + 2];
Index3i T0tv = GetTriangle(t0);
int c = IndexUtil.find_tri_other_vtx(a, b, T0tv);
// look up opposing triangle/vtx if we are not in boundary case
bool bIsBoundaryEdge = false;
int d = InvalidID;
int t1 = edges[4 * eab + 3];
if (t1 != InvalidID)
{
Index3i T1tv = GetTriangle(t1);
d = IndexUtil.find_tri_other_vtx(a, b, T1tv);
if (c == d)
{
return(MeshResult.Failed_FoundDuplicateTriangle);
}
}
else
{
bIsBoundaryEdge = true;
}
// We cannot collapse if edge lists of a and b share vertices other
// than c and d (because then we will make a triangle [x b b].
// Unfortunately I cannot see a way to do this more efficiently than brute-force search
// [TODO] if we had tri iterator for a, couldn't we check each tri for b (skipping t0 and t1) ?
List <int> edges_a = vertex_edges[a];
int edges_a_count = 0;
foreach (int eid_a in edges_a)
{
int vax = edge_other_v(eid_a, a);
edges_a_count++;
if (vax == b || vax == c || vax == d)
{
continue;
}
foreach (int eid_b in edges_b)
{
if (edge_other_v(eid_b, b) == vax)
{
return(MeshResult.Failed_InvalidNeighbourhood);
}
}
}
// We cannot collapse if we have a tetrahedron. In this case a has 3 nbr edges,
// and edge cd exists. But that is not conclusive, we also have to check that
// cd is an internal edge, and that each of its tris contain a or b
if (edges_a_count == 3 && bIsBoundaryEdge == false)
{
int edc = find_edge(d, c);
int edc_i = 4 * edc;
if (edc != InvalidID && edges[edc_i + 3] != InvalidID)
{
int edc_t0 = edges[edc_i + 2];
int edc_t1 = edges[edc_i + 3];
if ((tri_has_v(edc_t0, a) && tri_has_v(edc_t1, b)) ||
(tri_has_v(edc_t0, b) && tri_has_v(edc_t1, a)))
{
return(MeshResult.Failed_CollapseTetrahedron);
}
}
}
else if (edges_a_count == 2 && bIsBoundaryEdge == true)
{
// cannot collapse edge if we are down to a single triangle
if (edges_b.Count == 2 && vertex_edges[c].Count == 2)
{
return(MeshResult.Failed_CollapseTriangle);
}
}
// [RMS] this was added from C++ version...seems like maybe I never hit
// this case? Conceivably could be porting bug but looking at the
// C++ code I cannot see how we could possibly have caught this case...
//
// cannot collapse an edge where both vertices are boundary vertices
// because that would create a bowtie
//
// NOTE: potentially scanning all edges here...couldn't we
// pick up eac/bc/ad/bd as we go? somehow?
if (bIsBoundaryEdge == false && vertex_is_boundary(a) && vertex_is_boundary(b))
{
return(MeshResult.Failed_InvalidNeighbourhood);
}
// 1) remove edge ab from vtx b
// 2) find edges ad and ac, and tris tad, tac across those edges (will use later)
// 3) for other edges, replace a with b, and add that edge to b
// 4) replace a with b in all triangles connected to a
int ead = InvalidID, eac = InvalidID;
int tad = InvalidID, tac = InvalidID;
foreach (int eid in edges_a)
{
int o = edge_other_v(eid, a);
if (o == b)
{
if (edges_b.Remove(eid) != true)
{
debug_fail("remove case o == b");
}
}
else if (o == c)
{
eac = eid;
if (vertex_edges[c].Remove(eid) != true)
{
debug_fail("remove case o == c");
}
tac = edge_other_t(eid, t0);
}
else if (o == d)
{
ead = eid;
if (vertex_edges[d].Remove(eid) != true)
{
debug_fail("remove case o == c, step 1");
}
tad = edge_other_t(eid, t1);
}
else
{
if (replace_edge_vertex(eid, a, b) == -1)
{
debug_fail("remove case else");
}
edges_b.Add(eid);
}
// [TODO] perhaps we can already have unique tri list because of the manifold-nbrhood check we need to do...
for (int j = 0; j < 2; ++j)
{
int t_j = edges[4 * eid + 2 + j];
if (t_j != InvalidID && t_j != t0 && t_j != t1)
{
if (tri_has_v(t_j, a))
{
if (replace_tri_vertex(t_j, a, b) == -1)
{
debug_fail("remove last check");
}
vertices_refcount.increment(b);
vertices_refcount.decrement(a);
}
}
}
}
int ebc = InvalidID, ebd = InvalidID;
if (bIsBoundaryEdge == false)
{
// remove all edges from vtx a, then remove vtx a
edges_a.Clear();
Debug.Assert(vertices_refcount.refCount(a) == 3); // in t0,t1, and initial ref
vertices_refcount.decrement(a, 3);
Debug.Assert(vertices_refcount.isValid(a) == false);
// remove triangles T0 and T1, and update b/c/d refcounts
triangles_refcount.decrement(t0);
triangles_refcount.decrement(t1);
vertices_refcount.decrement(c);
vertices_refcount.decrement(d);
vertices_refcount.decrement(b, 2);
Debug.Assert(triangles_refcount.isValid(t0) == false);
Debug.Assert(triangles_refcount.isValid(t1) == false);
// remove edges ead, eab, eac
edges_refcount.decrement(ead);
edges_refcount.decrement(eab);
edges_refcount.decrement(eac);
Debug.Assert(edges_refcount.isValid(ead) == false);
Debug.Assert(edges_refcount.isValid(eab) == false);
Debug.Assert(edges_refcount.isValid(eac) == false);
// replace t0 and t1 in edges ebd and ebc that we kept
ebd = find_edge(b, d);
ebc = find_edge(b, c);
if (replace_edge_triangle(ebd, t1, tad) == -1)
{
debug_fail("isboundary=false branch, ebd replace triangle");
}
if (replace_edge_triangle(ebc, t0, tac) == -1)
{
debug_fail("isboundary=false branch, ebc replace triangle");
}
// update tri-edge-nbrs in tad and tac
if (tad != InvalidID)
{
if (replace_triangle_edge(tad, ead, ebd) == -1)
{
debug_fail("isboundary=false branch, ebd replace triangle");
}
}
if (tac != InvalidID)
{
if (replace_triangle_edge(tac, eac, ebc) == -1)
{
debug_fail("isboundary=false branch, ebd replace triangle");
}
}
}
else
{
// this is basically same code as above, just not referencing t1/d
// remove all edges from vtx a, then remove vtx a
edges_a.Clear();
Debug.Assert(vertices_refcount.refCount(a) == 2); // in t0 and initial ref
vertices_refcount.decrement(a, 2);
Debug.Assert(vertices_refcount.isValid(a) == false);
// remove triangle T0 and update b/c refcounts
triangles_refcount.decrement(t0);
vertices_refcount.decrement(c);
vertices_refcount.decrement(b);
Debug.Assert(triangles_refcount.isValid(t0) == false);
// remove edges eab and eac
edges_refcount.decrement(eab);
edges_refcount.decrement(eac);
Debug.Assert(edges_refcount.isValid(eab) == false);
Debug.Assert(edges_refcount.isValid(eac) == false);
// replace t0 in edge ebc that we kept
ebc = find_edge(b, c);
if (replace_edge_triangle(ebc, t0, tac) == -1)
{
debug_fail("isboundary=false branch, ebc replace triangle");
}
// update tri-edge-nbrs in tac
if (tac != InvalidID)
{
if (replace_triangle_edge(tac, eac, ebc) == -1)
{
debug_fail("isboundary=true branch, ebd replace triangle");
}
}
}
collapse.vKept = vKeep;
collapse.vRemoved = vRemove;
collapse.bIsBoundary = bIsBoundaryEdge;
collapse.eCollapsed = eab;
collapse.tRemoved0 = t0; collapse.tRemoved1 = t1;
collapse.eRemoved0 = eac; collapse.eRemoved1 = ead;
collapse.eKept0 = ebc; collapse.eKept1 = ebd;
updateTimeStamp();
return(MeshResult.Ok);
}
public MeshResult SplitEdge(int eab, out EdgeSplitInfo split)
{
split = new EdgeSplitInfo();
if (!IsEdge(eab))
{
return(MeshResult.Failed_NotAnEdge);
}
// look up primary edge & triangle
int eab_i = 4 * eab;
int a = edges[eab_i], b = edges[eab_i + 1];
int t0 = edges[eab_i + 2];
Index3i T0tv = GetTriangle(t0);
int[] T0tv_array = T0tv.array;
int c = IndexUtil.orient_tri_edge_and_find_other_vtx(ref a, ref b, T0tv_array);
// create new vertex
Vector3d vNew = 0.5 * (GetVertex(a) + GetVertex(b));
int f = AppendVertex(vNew);
// quite a bit of code is duplicated between boundary and non-boundary case, but it
// is too hard to follow later if we factor it out...
if (edge_is_boundary(eab))
{
// look up edge bc, which needs to be modified
Index3i T0te = GetTriEdges(t0);
int ebc = T0te[IndexUtil.find_edge_index_in_tri(b, c, T0tv_array)];
// rewrite existing triangle
replace_tri_vertex(t0, b, f);
// add new second triangle
int t2 = add_triangle_only(f, b, c, InvalidID, InvalidID, InvalidID);
if (triangle_groups != null)
{
triangle_groups.insert(triangle_groups[t0], t2);
}
// rewrite edge bc, create edge af
replace_edge_triangle(ebc, t0, t2);
int eaf = eab;
replace_edge_vertex(eaf, b, f);
vertex_edges[b].Remove(eab);
vertex_edges[f].Add(eaf);
// create new edges fb and fc
int efb = add_edge(f, b, t2);
int efc = add_edge(f, c, t0, t2);
// update triangle edge-nbrs
replace_triangle_edge(t0, ebc, efc);
set_triangle_edges(t2, efb, ebc, efc);
// update vertex refcounts
vertices_refcount.increment(c);
vertices_refcount.increment(f, 2);
split.bIsBoundary = true;
split.vNew = f;
split.eNew = efb;
updateTimeStamp();
return(MeshResult.Ok);
}
else // interior triangle branch
// look up other triangle
{
int t1 = edges[eab_i + 3];
Index3i T1tv = GetTriangle(t1);
int[] T1tv_array = T1tv.array;
int d = IndexUtil.find_tri_other_vtx(a, b, T1tv_array);
// look up edges that we are going to need to update
// [TODO OPT] could use ordering to reduce # of compares here
Index3i T0te = GetTriEdges(t0);
int ebc = T0te[IndexUtil.find_edge_index_in_tri(b, c, T0tv_array)];
Index3i T1te = GetTriEdges(t1);
int edb = T1te[IndexUtil.find_edge_index_in_tri(d, b, T1tv_array)];
// rewrite existing triangles
replace_tri_vertex(t0, b, f);
replace_tri_vertex(t1, b, f);
// add two new triangles to close holes we just created
int t2 = add_triangle_only(f, b, c, InvalidID, InvalidID, InvalidID);
int t3 = add_triangle_only(f, d, b, InvalidID, InvalidID, InvalidID);
if (triangle_groups != null)
{
triangle_groups.insert(triangle_groups[t0], t2);
triangle_groups.insert(triangle_groups[t1], t3);
}
// update the edges we found above, to point to new triangles
replace_edge_triangle(ebc, t0, t2);
replace_edge_triangle(edb, t1, t3);
// edge eab became eaf
int eaf = eab; //Edge * eAF = eAB;
replace_edge_vertex(eaf, b, f);
// update a/b/f vertex-edges
vertex_edges[b].Remove(eab);
vertex_edges[f].Add(eaf);
// create new edges connected to f (also updates vertex-edges)
int efb = add_edge(f, b, t2, t3);
int efc = add_edge(f, c, t0, t2);
int edf = add_edge(d, f, t1, t3);
// update triangle edge-nbrs
replace_triangle_edge(t0, ebc, efc);
replace_triangle_edge(t1, edb, edf);
set_triangle_edges(t2, efb, ebc, efc);
set_triangle_edges(t3, edf, edb, efb);
// update vertex refcounts
vertices_refcount.increment(c);
vertices_refcount.increment(d);
vertices_refcount.increment(f, 4);
split.bIsBoundary = false;
split.vNew = f;
split.eNew = efb;
updateTimeStamp();
return(MeshResult.Ok);
}
}
/// <summary>
/// 1) Find intersection segments
/// 2) sort onto existing input mesh vtx/edge/face
/// </summary>
void find_segments()
{
var SegVtxMap = new Dictionary <Vector3d, SegmentVtx>();
// find intersection segments
// TODO: intersection polygons
// TODO: do we need to care about intersection vertices?
var targetSpatial = new DMeshAABBTree3(Target, true);
var cutSpatial = new DMeshAABBTree3(CutMesh, true);
var intersections = targetSpatial.FindAllIntersections(cutSpatial);
// for each segment, for each vtx, determine if it is
// at an existing vertex, on-edge, or in-face
Segments = new IntersectSegment[intersections.Segments.Count];
for (int i = 0; i < Segments.Length; ++i)
{
var isect = intersections.Segments[i];
var points = new Vector3dTuple2(isect.point0, isect.point1);
var iseg = new IntersectSegment()
{
base_tid = isect.t0
};
Segments[i] = iseg;
for (int j = 0; j < 2; ++j)
{
Vector3d v = points[j];
// if this exact vtx coord has been seen, use same vtx
SegmentVtx sv;
if (SegVtxMap.TryGetValue(v, out sv))
{
iseg[j] = sv;
continue;
}
sv = new SegmentVtx()
{
v = v
};
SegVertices.Add(sv);
SegVtxMap[v] = sv;
iseg[j] = sv;
// this vtx is tol-equal to input mesh vtx
int existing_v = find_existing_vertex(isect.point0);
if (existing_v >= 0)
{
sv.initial_type = sv.type = 0;
sv.elem_id = existing_v;
sv.vtx_id = existing_v;
VIDToSegVtxMap[sv.vtx_id] = sv;
continue;
}
var tri = new Triangle3d();
Target.GetTriVertices(isect.t0, ref tri.V0, ref tri.V1, ref tri.V2);
Index3i tv = Target.GetTriangle(isect.t0);
// this vtx is tol-on input mesh edge
int on_edge_i = on_edge(ref tri, ref v);
if (on_edge_i >= 0)
{
sv.initial_type = sv.type = 1;
sv.elem_id = Target.FindEdge(tv[on_edge_i], tv[(on_edge_i + 1) % 3]);
Util.gDevAssert(sv.elem_id != DMesh3.InvalidID);
add_edge_vtx(sv.elem_id, sv);
continue;
}
// otherwise contained in input mesh face
sv.initial_type = sv.type = 2;
sv.elem_id = isect.t0;
add_face_vtx(sv.elem_id, sv);
}
}
}
protected void compute_full(IEnumerable <int> Triangles, bool bIsFullMeshHint = false)
{
Graph = new DGraph3();
if (WantGraphEdgeInfo)
{
GraphEdges = new DVector <GraphEdgeInfo>();
}
Vertices = new Dictionary <Vector3d, int>();
// multithreaded precomputation of per-vertex values
double[] vertex_values = null;
if (PrecomputeVertexValues)
{
vertex_values = new double[Mesh.MaxVertexID];
IEnumerable <int> verts = Mesh.VertexIndices();
if (bIsFullMeshHint == false)
{
MeshVertexSelection vertices = new MeshVertexSelection(Mesh);
vertices.SelectTriangleVertices(Triangles);
verts = vertices;
}
gParallel.ForEach(verts, (vid) => {
vertex_values[vid] = ValueF(Mesh.GetVertex(vid));
});
VertexValueF = (vid) => { return(vertex_values[vid]); };
}
foreach (int tid in Triangles)
{
Vector3dTuple3 tv = new Vector3dTuple3();
Mesh.GetTriVertices(tid, ref tv.V0, ref tv.V1, ref tv.V2);
Index3i triVerts = Mesh.GetTriangle(tid);
Vector3d f = (VertexValueF != null) ?
new Vector3d(VertexValueF(triVerts.a), VertexValueF(triVerts.b), VertexValueF(triVerts.c))
: new Vector3d(ValueF(tv.V0), ValueF(tv.V1), ValueF(tv.V2));
// round f to 0 within epsilon?
if (f.x < 0 && f.y < 0 && f.z < 0)
{
continue;
}
if (f.x > 0 && f.y > 0 && f.z > 0)
{
continue;
}
Index3i triEdges = Mesh.GetTriEdges(tid);
if (f.x * f.y * f.z == 0)
{
int z0 = (f.x == 0) ? 0 : ((f.y == 0) ? 1 : 2);
int i1 = (z0 + 1) % 3, i2 = (z0 + 2) % 3;
if (f[i1] * f[i2] > 0)
{
continue; // single-vertex-crossing case, skip here and let other edges catch it
}
if (f[i1] == 0 || f[i2] == 0)
{
// on-edge case
int z1 = f[i1] == 0 ? i1 : i2;
if ((z0 + 1) % 3 != z1)
{
int tmp = z0; z0 = z1; z1 = tmp; // catch reverse-orientation cases
}
int e0 = add_or_append_vertex(Mesh.GetVertex(triVerts[z0]));
int e1 = add_or_append_vertex(Mesh.GetVertex(triVerts[z1]));
int graph_eid = Graph.AppendEdge(e0, e1, (int)TriangleCase.OnEdge);
if (WantGraphEdgeInfo)
{
add_on_edge(graph_eid, tid, triEdges[z0], new Index2i(e0, e1));
}
}
else
{
// edge/vertex case
Util.gDevAssert(f[i1] * f[i2] < 0);
int vert_vid = add_or_append_vertex(Mesh.GetVertex(triVerts[z0]));
int i = i1, j = i2;
if (triVerts[j] < triVerts[i])
{
int tmp = i; i = j; j = tmp;
}
Vector3d cross = find_crossing(tv[i], tv[j], f[i], f[j]);
int cross_vid = add_or_append_vertex(cross);
add_edge_pos(triVerts[i], triVerts[j], cross);
int graph_eid = Graph.AppendEdge(vert_vid, cross_vid, (int)TriangleCase.EdgeVertex);
if (WantGraphEdgeInfo)
{
add_edge_vert(graph_eid, tid, triEdges[(z0 + 1) % 3], triVerts[z0], new Index2i(vert_vid, cross_vid));
}
}
}
else
{
Index3i cross_verts = Index3i.Min;
int less_than = 0;
for (int tei = 0; tei < 3; ++tei)
{
int i = tei, j = (tei + 1) % 3;
if (f[i] < 0)
{
less_than++;
}
if (f[i] * f[j] > 0)
{
continue;
}
if (triVerts[j] < triVerts[i])
{
int tmp = i; i = j; j = tmp;
}
Vector3d cross = find_crossing(tv[i], tv[j], f[i], f[j]);
cross_verts[tei] = add_or_append_vertex(cross);
add_edge_pos(triVerts[i], triVerts[j], cross);
}
int e0 = (cross_verts.a == int.MinValue) ? 1 : 0;
int e1 = (cross_verts.c == int.MinValue) ? 1 : 2;
if (e0 == 0 && e1 == 2) // preserve orientation order
{
e0 = 2; e1 = 0;
}
// preserving orientation does not mean we get a *consistent* orientation across faces.
// To do that, we need to assign "sides". Either we have 1 less-than-0 or 1 greater-than-0 vtx.
// Arbitrary decide that we want loops oriented like bdry loops would be if we discarded less-than side.
// In that case, when we are "cutting off" one vertex, orientation would end up flipped
if (less_than == 1)
{
int tmp = e0; e0 = e1; e1 = tmp;
}
int ev0 = cross_verts[e0];
int ev1 = cross_verts[e1];
// [RMS] if function is garbage, we can end up w/ case where both crossings
// happen at same vertex, even though values are not the same (eg if
// some values are double.MaxValue). We will just fail in these cases.
if (ev0 != ev1)
{
Util.gDevAssert(ev0 != int.MinValue && ev1 != int.MinValue);
int graph_eid = Graph.AppendEdge(ev0, ev1, (int)TriangleCase.EdgeEdge);
if (WantGraphEdgeInfo)
{
add_edge_edge(graph_eid, tid, new Index2i(triEdges[e0], triEdges[e1]), new Index2i(ev0, ev1));
}
}
}
}
Vertices = null;
}
// This function checks that the mesh is well-formed, ie all internal data
// structures are consistent
public bool CheckValidity(bool bAllowNonManifoldVertices = false)
{
int[] triToVtxRefs = new int[this.MaxVertexID];
if (normals != null)
{
DMESH_CHECK_OR_FAIL(normals.size == vertices.size);
}
if (colors != null)
{
DMESH_CHECK_OR_FAIL(colors.size == vertices.size);
}
if (uv != null)
{
DMESH_CHECK_OR_FAIL(uv.size / 2 == vertices.size / 3);
}
if (triangle_groups != null)
{
DMESH_CHECK_OR_FAIL(triangle_groups.size == triangles.size / 3);
}
foreach (int tID in TriangleIndices())
{
DMESH_CHECK_OR_FAIL(IsTriangle(tID));
DMESH_CHECK_OR_FAIL(triangles_refcount.refCount(tID) == 1);
// vertices must exist
Index3i tv = GetTriangle(tID);
for (int j = 0; j < 3; ++j)
{
DMESH_CHECK_OR_FAIL(IsVertex(tv[j]));
triToVtxRefs[tv[j]] += 1;
}
// edges must exist and reference this tri
Index3i e = new Index3i();
for (int j = 0; j < 3; ++j)
{
int a = tv[j], b = tv[(j + 1) % 3];
e[j] = FindEdge(a, b);
DMESH_CHECK_OR_FAIL(e[j] != InvalidID);
DMESH_CHECK_OR_FAIL(edge_has_t(e[j], tID));
DMESH_CHECK_OR_FAIL(e[j] == FindEdgeFromTri(a, b, tID));
}
DMESH_CHECK_OR_FAIL(e[0] != e[1] && e[0] != e[2] && e[1] != e[2]);
// tri nbrs must exist and reference this tri, or same edge must be boundary edge
Index3i te = GetTriEdges(tID);
for (int j = 0; j < 3; ++j)
{
int eid = te[j];
DMESH_CHECK_OR_FAIL(IsEdge(eid));
int tOther = edge_other_t(eid, tID);
if (tOther == InvalidID)
{
DMESH_CHECK_OR_FAIL(tri_is_boundary(tID));
continue;
}
DMESH_CHECK_OR_FAIL(tri_has_neighbour_t(tOther, tID) == true);
// edge must have same two verts as tri for same index
int a = tv[j], b = tv[(j + 1) % 3];
Index2i ev = GetEdgeV(te[j]);
DMESH_CHECK_OR_FAIL(IndexUtil.same_pair_unordered(a, b, ev[0], ev[1]));
// also check that nbr edge has opposite orientation
Index3i othertv = GetTriangle(tOther);
int found = IndexUtil.find_tri_ordered_edge(b, a, othertv.array);
DMESH_CHECK_OR_FAIL(found != InvalidID);
}
}
// edge verts/tris must exist
foreach (int eID in EdgeIndices())
{
DMESH_CHECK_OR_FAIL(IsEdge(eID));
DMESH_CHECK_OR_FAIL(edges_refcount.refCount(eID) == 1);
Index2i ev = GetEdgeV(eID);
Index2i et = GetEdgeT(eID);
DMESH_CHECK_OR_FAIL(IsVertex(ev[0]));
DMESH_CHECK_OR_FAIL(IsVertex(ev[1]));
DMESH_CHECK_OR_FAIL(ev[0] < ev[1]);
DMESH_CHECK_OR_FAIL(IsTriangle(et[0]));
if (et[1] != InvalidID)
{
DMESH_CHECK_OR_FAIL(IsTriangle(et[1]));
}
}
// verify compact check
bool is_compact = vertices_refcount.is_dense;
for (int vid = 0; vid < vertices.Length; ++vid)
{
DMESH_CHECK_OR_FAIL(vertices_refcount.isValid(vid));
}
// vertex edges must exist and reference this vert
foreach (int vID in VertexIndices())
{
DMESH_CHECK_OR_FAIL(IsVertex(vID));
List <int> l = vertex_edges[vID];
foreach (int edgeid in l)
{
DMESH_CHECK_OR_FAIL(IsEdge(edgeid));
DMESH_CHECK_OR_FAIL(edge_has_v(edgeid, vID));
int otherV = edge_other_v(edgeid, vID);
int e2 = find_edge(vID, otherV);
DMESH_CHECK_OR_FAIL(e2 != InvalidID);
DMESH_CHECK_OR_FAIL(e2 == edgeid);
e2 = find_edge(otherV, vID);
DMESH_CHECK_OR_FAIL(e2 != InvalidID);
DMESH_CHECK_OR_FAIL(e2 == edgeid);
}
List <int> vTris = new List <int>(), vTris2 = new List <int>();
GetVtxTriangles(vID, vTris, false);
GetVtxTriangles(vID, vTris2, true);
DMESH_CHECK_OR_FAIL(vTris.Count == vTris2.Count);
//System.Console.WriteLine(string.Format("{0} {1} {2}", vID, vTris.Count, GetVtxEdges(vID).Count));
if (bAllowNonManifoldVertices)
{
DMESH_CHECK_OR_FAIL(vTris.Count <= GetVtxEdges(vID).Count);
}
else
{
DMESH_CHECK_OR_FAIL(vTris.Count == GetVtxEdges(vID).Count || vTris.Count == GetVtxEdges(vID).Count - 1);
}
DMESH_CHECK_OR_FAIL(vertices_refcount.refCount(vID) == vTris.Count + 1);
DMESH_CHECK_OR_FAIL(triToVtxRefs[vID] == vTris.Count);
foreach (int tID in vTris)
{
DMESH_CHECK_OR_FAIL(tri_has_v(tID, vID));
}
// check that edges around vert only references tris above, and reference all of them!
List <int> vRemoveTris = new List <int>(vTris);
foreach (int edgeid in l)
{
Index2i edget = GetEdgeT(edgeid);
DMESH_CHECK_OR_FAIL(vTris.Contains(edget[0]));
if (edget[1] != InvalidID)
{
DMESH_CHECK_OR_FAIL(vTris.Contains(edget[1]));
}
vRemoveTris.Remove(edget[0]);
if (edget[1] != InvalidID)
{
vRemoveTris.Remove(edget[1]);
}
}
DMESH_CHECK_OR_FAIL(vRemoveTris.Count == 0);
}
return(true);
}
// insert point at bary_coords inside tid. If point is at vtx, just use that vtx.
// If it is on an edge, do an edge split. Otherwise poke face.
int insert_corner_from_bary(int iCorner, int tid, Vector3d bary_coords,
double bary_tol, double spatial_tol, out bool is_existing_v)
{
is_existing_v = false;
Vector2d vInsert = Curve[iCorner];
Index3i tv = Mesh.GetTriangle(tid);
// handle cases where corner is on a vertex
int cornerv = -1;
if (bary_coords.x > 1 - bary_tol)
{
cornerv = tv.a;
}
else if (bary_coords.y > 1 - bary_tol)
{
cornerv = tv.b;
}
else if (bary_coords.z > 1 - bary_tol)
{
cornerv = tv.c;
}
if (cornerv != -1 && PointF(cornerv).Distance(vInsert) < spatial_tol)
{
is_existing_v = true;
return(cornerv);
}
// handle cases where corner is on an edge
int split_edge = -1;
if (bary_coords.x < bary_tol)
{
split_edge = 1;
}
else if (bary_coords.y < bary_tol)
{
split_edge = 2;
}
else if (bary_coords.z < bary_tol)
{
split_edge = 0;
}
if (split_edge >= 0)
{
int eid = Mesh.GetTriEdge(tid, split_edge);
Index2i ev = Mesh.GetEdgeV(eid);
Segment2d seg = new Segment2d(PointF(ev.a), PointF(ev.b));
if (seg.DistanceSquared(vInsert) < spatial_tol * spatial_tol)
{
Index2i et = Mesh.GetEdgeT(eid);
spatial_remove_triangles(et.a, et.b);
DMesh3.EdgeSplitInfo split_info;
MeshResult splitResult = Mesh.SplitEdge(eid, out split_info);
if (splitResult != MeshResult.Ok)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corner_from_bary: edge split failed in case sum==2 - " + splitResult.ToString());
}
SetPointF(split_info.vNew, vInsert);
spatial_add_triangles(et.a, et.b);
spatial_add_triangles(split_info.eNewT2, split_info.eNewT3);
return(split_info.vNew);
}
}
spatial_remove_triangle(tid);
// otherwise corner is inside triangle
DMesh3.PokeTriangleInfo pokeinfo;
MeshResult result = Mesh.PokeTriangle(tid, bary_coords, out pokeinfo);
if (result != MeshResult.Ok)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corner_from_bary: face poke failed - " + result.ToString());
}
SetPointF(pokeinfo.new_vid, vInsert);
spatial_add_triangle(tid);
spatial_add_triangle(pokeinfo.new_t1);
spatial_add_triangle(pokeinfo.new_t2);
return(pokeinfo.new_vid);
}
// (sequentially) find each triangle that path point lies in, and insert a vertex for
// that point into mesh.
void insert_corners()
{
PrimalQuery2d query = new PrimalQuery2d(PointF);
if (UseTriSpatial)
{
AxisAlignedBox3d bounds3 = Mesh.CachedBounds;
AxisAlignedBox2d bounds2 = new AxisAlignedBox2d(bounds3.Min.xy, bounds3.Max.xy);
triSpatial = new TriangleBinsGrid2d(bounds2, 32);
foreach (int tid in Mesh.TriangleIndices())
{
spatial_add_triangle(tid);
}
}
Func <int, Vector2d, bool> inTriangleF = (tid, pos) => {
Index3i tv = Mesh.GetTriangle(tid);
int query_result = query.ToTriangleUnsigned(pos, tv.a, tv.b, tv.c);
return(query_result == -1 || query_result == 0);
};
CurveVertices = new int[Curve.VertexCount];
for (int i = 0; i < Curve.VertexCount; ++i)
{
Vector2d vInsert = Curve[i];
bool inserted = false;
int contain_tid = DMesh3.InvalidID;
if (triSpatial != null)
{
contain_tid = triSpatial.FindContainingTriangle(vInsert, inTriangleF);
}
else
{
foreach (int tid in Mesh.TriangleIndices())
{
Index3i tv = Mesh.GetTriangle(tid);
// [RMS] using unsigned query here because we do not need to care about tri CW/CCW orientation
// (right? otherwise we have to explicitly invert mesh. Nothing else we do depends on tri orientation)
//int query_result = query.ToTriangle(vInsert, tv.a, tv.b, tv.c);
int query_result = query.ToTriangleUnsigned(vInsert, tv.a, tv.b, tv.c);
if (query_result == -1 || query_result == 0)
{
contain_tid = tid;
break;
}
}
}
if (contain_tid != DMesh3.InvalidID)
{
Index3i tv = Mesh.GetTriangle(contain_tid);
Vector3d bary = MathUtil.BarycentricCoords(vInsert, PointF(tv.a), PointF(tv.b), PointF(tv.c));
int vid = insert_corner_from_bary(i, contain_tid, bary);
if (vid > 0) // this should be always happening..
{
CurveVertices[i] = vid;
inserted = true;
}
else
{
throw new Exception("MeshInsertUVPolyCurve.insert_corners: failed to insert vertex " + i.ToString());
}
}
if (inserted == false)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corners: curve vertex "
+ i.ToString() + " is not inside or on any mesh triangle!");
}
}
}
// insert point at bary_coords inside tid. If point is at vtx, just use that vtx.
// If it is on an edge, do an edge split. Otherwise poke face.
int insert_corner_from_bary(int iCorner, int tid, Vector3d bary_coords, double tol = MathUtil.ZeroTolerance)
{
Vector2d vInsert = Curve[iCorner];
Index3i tv = Mesh.GetTriangle(tid);
// handle cases where corner is on a vertex
if (bary_coords.x > 1 - tol)
{
return(tv.a);
}
else if (bary_coords.y > 1 - tol)
{
return(tv.b);
}
else if (bary_coords.z > 1 - tol)
{
return(tv.c);
}
// handle cases where corner is on an edge
int split_edge = -1;
if (bary_coords.x < tol)
{
split_edge = 1;
}
else if (bary_coords.y < tol)
{
split_edge = 2;
}
else if (bary_coords.z < tol)
{
split_edge = 0;
}
if (split_edge >= 0)
{
int eid = Mesh.GetTriEdge(tid, split_edge);
Index2i ev = Mesh.GetEdgeT(eid);
spatial_remove_triangles(ev.a, ev.b);
DMesh3.EdgeSplitInfo split_info;
MeshResult splitResult = Mesh.SplitEdge(eid, out split_info);
if (splitResult != MeshResult.Ok)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corner_from_bary: edge split failed in case sum==2 - " + splitResult.ToString());
}
SetPointF(split_info.vNew, vInsert);
spatial_add_triangles(ev.a, ev.b);
spatial_add_triangles(split_info.eNewT2, split_info.eNewT3);
return(split_info.vNew);
}
spatial_remove_triangle(tid);
// otherwise corner is inside triangle
DMesh3.PokeTriangleInfo pokeinfo;
MeshResult result = Mesh.PokeTriangle(tid, bary_coords, out pokeinfo);
if (result != MeshResult.Ok)
{
throw new Exception("MeshInsertUVPolyCurve.insert_corner_from_bary: face poke failed - " + result.ToString());
}
spatial_add_triangle(tid);
spatial_add_triangle(pokeinfo.new_t1);
spatial_add_triangle(pokeinfo.new_t2);
SetPointF(pokeinfo.new_vid, vInsert);
return(pokeinfo.new_vid);
}
/// <summary>
// This function checks that the mesh is well-formed, ie all internal data
// structures are consistent
/// </summary>
public bool CheckValidity(bool bAllowNonManifoldVertices = false, FailMode eFailMode = FailMode.Throw)
{
int[] triToVtxRefs = new int[this.MaxVertexID];
bool is_ok = true;
Action <bool> CheckOrFailF = (b) => { is_ok = is_ok && b; };
if (eFailMode == FailMode.DebugAssert)
{
CheckOrFailF = (b) => { Debug.Assert(b); is_ok = is_ok && b; };
}
else if (eFailMode == FailMode.gDevAssert)
{
CheckOrFailF = (b) => { Util.gDevAssert(b); is_ok = is_ok && b; };
}
else if (eFailMode == FailMode.Throw)
{
CheckOrFailF = (b) => { if (b == false)
{
throw new Exception("DMesh3.CheckValidity: check failed");
}
};
}
if (normals != null)
{
CheckOrFailF(normals.size == vertices.size);
}
if (colors != null)
{
CheckOrFailF(colors.size == vertices.size);
}
if (uv != null)
{
CheckOrFailF(uv.size / 2 == vertices.size / 3);
}
if (triangle_groups != null)
{
CheckOrFailF(triangle_groups.size == triangles.size / 3);
}
foreach (int tID in TriangleIndices())
{
CheckOrFailF(IsTriangle(tID));
CheckOrFailF(triangles_refcount.refCount(tID) == 1);
// vertices must exist
Index3i tv = GetTriangle(tID);
for (int j = 0; j < 3; ++j)
{
CheckOrFailF(IsVertex(tv[j]));
triToVtxRefs[tv[j]] += 1;
}
// edges must exist and reference this tri
var e = new Index3i();
for (int j = 0; j < 3; ++j)
{
int a = tv[j], b = tv[(j + 1) % 3];
e[j] = FindEdge(a, b);
CheckOrFailF(e[j] != InvalidID);
CheckOrFailF(edge_has_t(e[j], tID));
CheckOrFailF(e[j] == FindEdgeFromTri(a, b, tID));
}
CheckOrFailF(e[0] != e[1] && e[0] != e[2] && e[1] != e[2]);
// tri nbrs must exist and reference this tri, or same edge must be boundary edge
Index3i te = GetTriEdges(tID);
for (int j = 0; j < 3; ++j)
{
int eid = te[j];
CheckOrFailF(IsEdge(eid));
int tOther = edge_other_t(eid, tID);
if (tOther == InvalidID)
{
CheckOrFailF(tri_is_boundary(tID));
continue;
}
CheckOrFailF(tri_has_neighbour_t(tOther, tID) == true);
// edge must have same two verts as tri for same index
int a = tv[j], b = tv[(j + 1) % 3];
Index2i ev = GetEdgeV(te[j]);
CheckOrFailF(IndexUtil.same_pair_unordered(a, b, ev[0], ev[1]));
// also check that nbr edge has opposite orientation
Index3i othertv = GetTriangle(tOther);
int found = IndexUtil.find_tri_ordered_edge(b, a, othertv.array);
CheckOrFailF(found != InvalidID);
}
}
// edge verts/tris must exist
foreach (int eID in EdgeIndices())
{
CheckOrFailF(IsEdge(eID));
CheckOrFailF(edges_refcount.refCount(eID) == 1);
Index2i ev = GetEdgeV(eID);
Index2i et = GetEdgeT(eID);
CheckOrFailF(IsVertex(ev[0]));
CheckOrFailF(IsVertex(ev[1]));
CheckOrFailF(et[0] != InvalidID);
CheckOrFailF(ev[0] < ev[1]);
CheckOrFailF(IsTriangle(et[0]));
if (et[1] != InvalidID)
{
CheckOrFailF(IsTriangle(et[1]));
}
}
// verify compact check
bool is_compact = vertices_refcount.is_dense;
if (is_compact)
{
for (int vid = 0; vid < vertices.Length / 3; ++vid)
{
CheckOrFailF(vertices_refcount.isValid(vid));
}
}
// vertex edges must exist and reference this vert
foreach (int vID in VertexIndices())
{
CheckOrFailF(IsVertex(vID));
Vector3d v = GetVertex(vID);
CheckOrFailF(double.IsNaN(v.LengthSquared) == false);
CheckOrFailF(double.IsInfinity(v.LengthSquared) == false);
foreach (int edgeid in vertex_edges.ValueItr(vID))
{
CheckOrFailF(IsEdge(edgeid));
CheckOrFailF(edge_has_v(edgeid, vID));
int otherV = edge_other_v(edgeid, vID);
int e2 = find_edge(vID, otherV);
CheckOrFailF(e2 != InvalidID);
CheckOrFailF(e2 == edgeid);
e2 = find_edge(otherV, vID);
CheckOrFailF(e2 != InvalidID);
CheckOrFailF(e2 == edgeid);
}
foreach (int nbr_vid in VtxVerticesItr(vID))
{
CheckOrFailF(IsVertex(nbr_vid));
int edge = find_edge(vID, nbr_vid);
CheckOrFailF(IsEdge(edge));
}
List <int> vTris = new List <int>(), vTris2 = new List <int>();
GetVtxTriangles(vID, vTris, false);
GetVtxTriangles(vID, vTris2, true);
CheckOrFailF(vTris.Count == vTris2.Count);
//System.Console.WriteLine(string.Format("{0} {1} {2}", vID, vTris.Count, GetVtxEdges(vID).Count));
if (bAllowNonManifoldVertices)
{
CheckOrFailF(vTris.Count <= GetVtxEdgeCount(vID));
}
else
{
CheckOrFailF(vTris.Count == GetVtxEdgeCount(vID) || vTris.Count == GetVtxEdgeCount(vID) - 1);
}
CheckOrFailF(vertices_refcount.refCount(vID) == vTris.Count + 1);
CheckOrFailF(triToVtxRefs[vID] == vTris.Count);
foreach (int tID in vTris)
{
CheckOrFailF(tri_has_v(tID, vID));
}
// check that edges around vert only references tris above, and reference all of them!
var vRemoveTris = new List <int>(vTris);
foreach (int edgeid in vertex_edges.ValueItr(vID))
{
Index2i edget = GetEdgeT(edgeid);
CheckOrFailF(vTris.Contains(edget[0]));
if (edget[1] != InvalidID)
{
CheckOrFailF(vTris.Contains(edget[1]));
}
vRemoveTris.Remove(edget[0]);
if (edget[1] != InvalidID)
{
vRemoveTris.Remove(edget[1]);
}
}
CheckOrFailF(vRemoveTris.Count == 0);
}
return(is_ok);
}
public static bool orient_tri_edge(ref int a, ref int b, Index3i tri_verts)
{
return(orient_tri_edge(ref a, ref b, ref tri_verts));
}
IOReadResult BuildMeshes_ByMaterial(ReadOptions options, IMeshBuilder builder)
{
if (vPositions.Length == 0)
{
return(new IOReadResult(IOCode.GarbageDataError, "No vertices in file"));
}
if (vTriangles.Length == 0)
{
return(new IOReadResult(IOCode.GarbageDataError, "No triangles in file"));
}
bool bHaveNormals = (vNormals.Length > 0);
bool bHaveColors = (vColors.Length > 0);
bool bHaveUVs = (vUVs.Length > 0);
List <int> usedMaterialIDs = new List <int>(UsedMaterials.Keys);
usedMaterialIDs.Add(Triangle.InvalidMaterialID);
foreach (int material_id in usedMaterialIDs)
{
int matID = Triangle.InvalidMaterialID;
if (material_id != Triangle.InvalidMaterialID)
{
string sMatName = UsedMaterials[material_id];
OBJMaterial useMat = Materials[sMatName];
matID = builder.BuildMaterial(useMat);
}
bool bMatHaveUVs = (material_id == Triangle.InvalidMaterialID) ? false : bHaveUVs;
// don't append mesh until we actually see triangles
int meshID = -1;
Dictionary <Index3i, int> mapV = new Dictionary <Index3i, int>();
for (int k = 0; k < vTriangles.Length; ++k)
{
Triangle t = vTriangles[k];
if (t.nMaterialID == material_id)
{
if (meshID == -1)
{
meshID = builder.AppendNewMesh(bHaveNormals, bHaveColors, bMatHaveUVs, false);
}
Triangle t2 = new Triangle();
for (int j = 0; j < 3; ++j)
{
Index3i vk = new Index3i(
t.vIndices[j] - 1, t.vNormals[j] - 1, t.vUVs[j] - 1);
int use_vtx = -1;
if (mapV.ContainsKey(vk) == false)
{
use_vtx = append_vertex(builder, vk, bHaveNormals, bHaveColors, bMatHaveUVs);
mapV[vk] = use_vtx;
}
else
{
use_vtx = mapV[vk];
}
t2.vIndices[j] = use_vtx;
}
append_triangle(builder, t2);
}
}
if (matID != Triangle.InvalidMaterialID)
{
builder.AssignMaterial(matID, meshID);
}
}
return(new IOReadResult(IOCode.Ok, ""));
}
ProcessResult ProcessEdge(int edgeID)
{
EdgeConstraint constraint =
(constraints == null) ? EdgeConstraint.Unconstrained : constraints.GetEdgeConstraint(edgeID);
if (constraint.NoModifications)
{
return(ProcessResult.Ignored_EdgeIsFullyConstrained);
}
// look up verts and tris for this edge
int a = 0, b = 0, t0 = 0, t1 = 0;
if (mesh.GetEdge(edgeID, ref a, ref b, ref t0, ref t1) == false)
{
return(ProcessResult.Failed_NotAnEdge);
}
bool bIsBoundaryEdge = (t1 == DMesh3.InvalidID);
// look up 'other' verts c (from t0) and d (from t1, if it exists)
Index3i T0tv = mesh.GetTriangle(t0);
int c = IndexUtil.find_tri_other_vtx(a, b, T0tv);
Index3i T1tv = (bIsBoundaryEdge) ? DMesh3.InvalidTriangle : mesh.GetTriangle(t1);
int d = (bIsBoundaryEdge) ? DMesh3.InvalidID : IndexUtil.find_tri_other_vtx(a, b, T1tv);
Vector3d vA = mesh.GetVertex(a);
Vector3d vB = mesh.GetVertex(b);
double edge_len_sqr = (vA - vB).LengthSquared;
begin_collapse();
// check if we should collapse, and also find which vertex we should collapse to,
// in cases where we have constraints/etc
int collapse_to = -1;
bool bCanCollapse = EnableCollapses &&
constraint.CanCollapse &&
edge_len_sqr < MinEdgeLength * MinEdgeLength &&
can_collapse_constraints(edgeID, a, b, c, d, t0, t1, out collapse_to);
// optimization: if edge cd exists, we cannot collapse or flip. look that up here?
// funcs will do it internally...
// (or maybe we can collapse if cd exists? edge-collapse doesn't check for it explicitly...)
// if edge length is too short, we want to collapse it
bool bTriedCollapse = false;
if (bCanCollapse)
{
int iKeep = b, iCollapse = a;
Vector3d vNewPos = (vA + vB) * 0.5;
// if either vtx is fixed, collapse to that position
if (collapse_to == b)
{
vNewPos = vB;
}
else if (collapse_to == a)
{
iKeep = a; iCollapse = b;
vNewPos = vA;
}
else
{
vNewPos = get_projected_collapse_position(iKeep, vNewPos);
}
// TODO be smart about picking b (keep vtx).
// - swap if one is bdry vtx, for example?
// lots of cases where we cannot collapse, but we should just let
// mesh sort that out, right?
COUNT_COLLAPSES++;
DMesh3.EdgeCollapseInfo collapseInfo;
MeshResult result = mesh.CollapseEdge(iKeep, iCollapse, out collapseInfo);
if (result == MeshResult.Ok)
{
mesh.SetVertex(b, vNewPos);
if (constraints != null)
{
constraints.ClearEdgeConstraint(edgeID);
constraints.ClearEdgeConstraint(collapseInfo.eRemoved0);
if (collapseInfo.eRemoved1 != DMesh3.InvalidID)
{
constraints.ClearEdgeConstraint(collapseInfo.eRemoved1);
}
constraints.ClearVertexConstraint(iCollapse);
}
DoDebugChecks();
return(ProcessResult.Ok_Collapsed);
}
else
{
bTriedCollapse = true;
}
}
end_collapse();
begin_flip();
// if this is not a boundary edge, maybe we want to flip
bool bTriedFlip = false;
if (EnableFlips && constraint.CanFlip && bIsBoundaryEdge == false)
{
// don't want to flip if it will invert triangle...tetrahedron sign??
// can we do this more efficiently somehow?
bool a_is_boundary_vtx = (MeshIsClosed) ? false : (bIsBoundaryEdge || mesh.vertex_is_boundary(a));
bool b_is_boundary_vtx = (MeshIsClosed) ? false : (bIsBoundaryEdge || mesh.vertex_is_boundary(b));
bool c_is_boundary_vtx = (MeshIsClosed) ? false : mesh.vertex_is_boundary(c);
bool d_is_boundary_vtx = (MeshIsClosed) ? false : mesh.vertex_is_boundary(d);
int valence_a = mesh.GetVtxEdgeValence(a), valence_b = mesh.GetVtxEdgeValence(b);
int valence_c = mesh.GetVtxEdgeValence(c), valence_d = mesh.GetVtxEdgeValence(d);
int valence_a_target = (a_is_boundary_vtx) ? valence_a : 6;
int valence_b_target = (b_is_boundary_vtx) ? valence_b : 6;
int valence_c_target = (c_is_boundary_vtx) ? valence_c : 6;
int valence_d_target = (d_is_boundary_vtx) ? valence_d : 6;
// if total valence error improves by flip, we want to do it
int curr_err = Math.Abs(valence_a - valence_a_target) + Math.Abs(valence_b - valence_b_target)
+ Math.Abs(valence_c - valence_c_target) + Math.Abs(valence_d - valence_d_target);
int flip_err = Math.Abs((valence_a - 1) - valence_a_target) + Math.Abs((valence_b - 1) - valence_b_target)
+ Math.Abs((valence_c + 1) - valence_c_target) + Math.Abs((valence_d + 1) - valence_d_target);
if (flip_err < curr_err)
{
// try flip
DMesh3.EdgeFlipInfo flipInfo;
COUNT_FLIPS++;
MeshResult result = mesh.FlipEdge(edgeID, out flipInfo);
if (result == MeshResult.Ok)
{
DoDebugChecks();
return(ProcessResult.Ok_Flipped);
}
else
{
bTriedFlip = true;
}
}
}
end_flip();
begin_split();
// if edge length is too long, we want to split it
bool bTriedSplit = false;
if (EnableSplits && constraint.CanSplit && edge_len_sqr > MaxEdgeLength * MaxEdgeLength)
{
DMesh3.EdgeSplitInfo splitInfo;
COUNT_SPLITS++;
MeshResult result = mesh.SplitEdge(edgeID, out splitInfo);
if (result == MeshResult.Ok)
{
update_after_split(edgeID, a, b, splitInfo);
DoDebugChecks();
return(ProcessResult.Ok_Split);
}
else
{
bTriedSplit = true;
}
}
end_split();
if (bTriedFlip || bTriedSplit || bTriedCollapse)
{
return(ProcessResult.Failed_OpNotSuccessful);
}
else
{
return(ProcessResult.Ignored_EdgeIsFine);
}
}
public void clear()
{
nMaterialID = InvalidMaterialID;
nGroupID = InvalidGroupID;
vIndices = vNormals = vUVs = new Index3i(-1, -1, -1);
}
/// <summary>
/// Stitch two sets of boundary edges that are provided as unordered pairs of edges, by
/// adding triangulated quads between each edge pair.
/// If a failure is encountered during stitching, the triangles added up to that point are removed.
/// </summary>
public virtual int[] StitchUnorderedEdges(List <Index2i> EdgePairs, int group_id = -1)
{
int N = EdgePairs.Count;
int[] new_tris = new int[N * 2];
int i = 0;
for (; i < N; ++i)
{
Index2i edges = EdgePairs[i];
// look up and orient the first edge
Index4i edge_a = Mesh.GetEdge(edges.a);
if (edge_a.d != DMesh3.InvalidID)
{
goto operation_failed;
}
Index3i edge_a_tri = Mesh.GetTriangle(edge_a.c);
int a = edge_a.a, b = edge_a.b;
IndexUtil.orient_tri_edge(ref a, ref b, edge_a_tri);
// look up and orient the second edge
Index4i edge_b = Mesh.GetEdge(edges.b);
if (edge_b.d != DMesh3.InvalidID)
{
goto operation_failed;
}
Index3i edge_b_tri = Mesh.GetTriangle(edge_b.c);
int c = edge_b.a, d = edge_b.b;
IndexUtil.orient_tri_edge(ref c, ref d, edge_b_tri);
// swap second edge (right? should this be a parameter?)
int tmp = c; c = d; d = tmp;
Index3i t1 = new Index3i(b, a, d);
Index3i t2 = new Index3i(a, c, d);
int tid1 = Mesh.AppendTriangle(t1, group_id);
int tid2 = Mesh.AppendTriangle(t2, group_id);
if (tid1 == DMesh3.InvalidID || tid2 == DMesh3.InvalidID)
{
goto operation_failed;
}
new_tris[2 * i] = tid1;
new_tris[2 * i + 1] = tid2;
}
return(new_tris);
operation_failed:
// remove what we added so far
if (i > 0)
{
if (remove_triangles(new_tris, 2 * (i - 1)) == false)
{
throw new Exception("MeshEditor.StitchLoop: failed to add all triangles, and also failed to back out changes.");
}
}
return(null);
}
void make_level_set3(DMesh3 mesh, /*const std::vector<Vec3ui> &tri, const std::vector<Vec3f> &x*/
Vector3f origin, float dx,
int ni, int nj, int nk,
DenseGrid3f phi, int exact_band)
{
phi.resize(ni, nj, nk);
phi.assign((ni + nj + nk) * dx); // upper bound on distance
DenseGrid3i closest_tri = new DenseGrid3i(ni, nj, nk, -1);
DenseGrid3i intersection_count = new DenseGrid3i(ni, nj, nk, 0); // intersection_count(i,j,k) is # of tri intersections in (i-1,i]x{j}x{k}
// we begin by initializing distances near the mesh, and figuring out intersection counts
System.Console.WriteLine("start");
//Vector3f ijkmin, ijkmax; // [RMS] unused in original code
double ddx = (double)dx;
double ox = (double)origin[0], oy = (double)origin[1], oz = (double)origin[2];
foreach (int t in mesh.TriangleIndices())
{
Index3i triangle = mesh.GetTriangle(t);
int p = triangle.a, q = triangle.b, r = triangle.c;
Vector3d xp = mesh.GetVertex(p);
Vector3d xq = mesh.GetVertex(q);
Vector3d xr = mesh.GetVertex(r);
// coordinates in grid to high precision
double fip = (xp[0] - ox) / ddx, fjp = (xp[1] - oy) / ddx, fkp = (xp[2] - oz) / ddx;
double fiq = (xq[0] - ox) / ddx, fjq = (xq[1] - oy) / ddx, fkq = (xq[2] - oz) / ddx;
double fir = (xr[0] - ox) / ddx, fjr = (xr[1] - oy) / ddx, fkr = (xr[2] - oz) / ddx;
// do distances nearby
int i0 = MathUtil.Clamp(((int)MathUtil.Min(fip, fiq, fir)) - exact_band, 0, ni - 1);
int i1 = MathUtil.Clamp(((int)MathUtil.Max(fip, fiq, fir)) + exact_band + 1, 0, ni - 1);
int j0 = MathUtil.Clamp(((int)MathUtil.Min(fjp, fjq, fjr)) - exact_band, 0, nj - 1);
int j1 = MathUtil.Clamp(((int)MathUtil.Max(fjp, fjq, fjr)) + exact_band + 1, 0, nj - 1);
int k0 = MathUtil.Clamp(((int)MathUtil.Min(fkp, fkq, fkr)) - exact_band, 0, nk - 1);
int k1 = MathUtil.Clamp(((int)MathUtil.Max(fkp, fkq, fkr)) + exact_band + 1, 0, nk - 1);
for (int k = k0; k <= k1; ++k)
{
for (int j = j0; j <= j1; ++j)
{
for (int i = i0; i <= i1; ++i)
{
Vector3f gx = new Vector3f((float)i * dx + origin[0], (float)j * dx + origin[1], (float)k * dx + origin[2]);
float d = point_triangle_distance(gx, (Vector3f)xp, (Vector3f)xq, (Vector3f)xr);
if (d < phi[i, j, k])
{
phi[i, j, k] = d;
closest_tri[i, j, k] = t;
}
}
}
}
// and do intersection counts
j0 = MathUtil.Clamp((int)Math.Ceiling(MathUtil.Min(fjp, fjq, fjr)), 0, nj - 1);
j1 = MathUtil.Clamp((int)Math.Floor(MathUtil.Max(fjp, fjq, fjr)), 0, nj - 1);
k0 = MathUtil.Clamp((int)Math.Ceiling(MathUtil.Min(fkp, fkq, fkr)), 0, nk - 1);
k1 = MathUtil.Clamp((int)Math.Floor(MathUtil.Max(fkp, fkq, fkr)), 0, nk - 1);
for (int k = k0; k <= k1; ++k)
{
for (int j = j0; j <= j1; ++j)
{
double a, b, c;
if (point_in_triangle_2d(j, k, fjp, fkp, fjq, fkq, fjr, fkr, out a, out b, out c))
{
double fi = a * fip + b * fiq + c * fir; // intersection i coordinate
int i_interval = (int)(Math.Ceiling(fi)); // intersection is in (i_interval-1,i_interval]
if (i_interval < 0)
{
intersection_count.increment(0, j, k); // we enlarge the first interval to include everything to the -x direction
}
else if (i_interval < ni)
{
intersection_count.increment(i_interval, j, k);
}
// we ignore intersections that are beyond the +x side of the grid
}
}
}
}
System.Console.WriteLine("done narrow-band");
// and now we fill in the rest of the distances with fast sweeping
for (int pass = 0; pass < 2; ++pass)
{
sweep(mesh, phi, closest_tri, origin, dx, +1, +1, +1);
sweep(mesh, phi, closest_tri, origin, dx, -1, -1, -1);
sweep(mesh, phi, closest_tri, origin, dx, +1, +1, -1);
sweep(mesh, phi, closest_tri, origin, dx, -1, -1, +1);
sweep(mesh, phi, closest_tri, origin, dx, +1, -1, +1);
sweep(mesh, phi, closest_tri, origin, dx, -1, +1, -1);
sweep(mesh, phi, closest_tri, origin, dx, +1, -1, -1);
sweep(mesh, phi, closest_tri, origin, dx, -1, +1, +1);
}
System.Console.WriteLine("done sweeping");
// then figure out signs (inside/outside) from intersection counts
for (int k = 0; k < nk; ++k)
{
for (int j = 0; j < nj; ++j)
{
int total_count = 0;
for (int i = 0; i < ni; ++i)
{
total_count += intersection_count[i, j, k];
if (total_count % 2 == 1) // if parity of intersections so far is odd,
{
phi[i, j, k] = -phi[i, j, k]; // we are inside the mesh
}
}
}
}
System.Console.WriteLine("done signs");
} // end make_level_set_3
// Assumption here is that Submesh has been modified, but boundary loop has
// been preserved, and that old submesh has already been removed from this mesh.
// So, we just have to append new vertices and then rewrite triangles
// If new_tris or new_verts is non-null, we will return this info.
// new_tris should be set to TriangleCount (ie it is not necessarily a map)
// For new_verts, if we used an existing bdry vtx instead, we set the value to -(existing_index+1),
// otherwise the value is new_index (+1 is to handle 0)
//
// Returns true if submesh successfully inserted, false if any triangles failed
// (which happens if triangle would result in non-manifold mesh)
public bool ReinsertSubmesh(DSubmesh3 sub, ref int[] new_tris, out IndexMap SubToNewV,
DuplicateTriBehavior eDuplicateBehavior = DuplicateTriBehavior.AssertAbort)
{
if (sub.BaseBorderV == null)
{
throw new Exception("MeshEditor.ReinsertSubmesh: Submesh does not have required boundary info. Call ComputeBoundaryInfo()!");
}
DMesh3 submesh = sub.SubMesh;
bool bAllOK = true;
IndexFlagSet done_v = new IndexFlagSet(submesh.MaxVertexID, submesh.TriangleCount / 2);
SubToNewV = new IndexMap(submesh.MaxVertexID, submesh.VertexCount);
int nti = 0;
int NT = submesh.MaxTriangleID;
for (int ti = 0; ti < NT; ++ti)
{
if (submesh.IsTriangle(ti) == false)
{
continue;
}
Index3i sub_t = submesh.GetTriangle(ti);
int gid = submesh.GetTriangleGroup(ti);
Index3i new_t = Index3i.Zero;
for (int j = 0; j < 3; ++j)
{
int sub_v = sub_t[j];
int new_v = -1;
if (done_v[sub_v] == false)
{
// first check if this is a boundary vtx on submesh and maps to a bdry vtx on base mesh
if (submesh.IsBoundaryVertex(sub_v))
{
int base_v = (sub_v < sub.SubToBaseV.size) ? sub.SubToBaseV[sub_v] : -1;
if (base_v >= 0 && Mesh.IsVertex(base_v) && sub.BaseBorderV[base_v] == true)
{
// [RMS] this should always be true, but assert in tests to find out
Debug.Assert(Mesh.IsBoundaryVertex(base_v));
if (Mesh.IsBoundaryVertex(base_v))
{
new_v = base_v;
}
}
}
// if that didn't happen, append new vtx
if (new_v == -1)
{
new_v = Mesh.AppendVertex(submesh, sub_v);
}
SubToNewV[sub_v] = new_v;
done_v[sub_v] = true;
}
else
{
new_v = SubToNewV[sub_v];
}
new_t[j] = new_v;
}
// try to handle duplicate-tri case
if (eDuplicateBehavior == DuplicateTriBehavior.AssertContinue)
{
Debug.Assert(Mesh.FindTriangle(new_t.a, new_t.b, new_t.c) == DMesh3.InvalidID);
}
else
{
int existing_tid = Mesh.FindTriangle(new_t.a, new_t.b, new_t.c);
if (existing_tid != DMesh3.InvalidID)
{
if (eDuplicateBehavior == DuplicateTriBehavior.AssertAbort)
{
Debug.Assert(existing_tid == DMesh3.InvalidID);
return(false);
}
else if (eDuplicateBehavior == DuplicateTriBehavior.UseExisting)
{
if (new_tris != null)
{
new_tris[nti++] = existing_tid;
}
continue;
}
else if (eDuplicateBehavior == DuplicateTriBehavior.Replace)
{
Mesh.RemoveTriangle(existing_tid, false);
}
}
}
int new_tid = Mesh.AppendTriangle(new_t, gid);
Debug.Assert(new_tid != DMesh3.InvalidID && new_tid != DMesh3.NonManifoldID);
if (!Mesh.IsTriangle(new_tid))
{
bAllOK = false;
}
if (new_tris != null)
{
new_tris[nti++] = new_tid;
}
}
return(bAllOK);
}
protected virtual ProcessResult CollapseEdge(int edgeID, Vector3d vNewPos, out int collapseToV)
{
collapseToV = DMesh3.InvalidID;
RuntimeDebugCheck(edgeID);
EdgeConstraint constraint =
(constraints == null) ? EdgeConstraint.Unconstrained : constraints.GetEdgeConstraint(edgeID);
if (constraint.NoModifications)
{
return(ProcessResult.Ignored_EdgeIsFullyConstrained);
}
if (constraint.CanCollapse == false)
{
return(ProcessResult.Ignored_EdgeIsFullyConstrained);
}
// look up verts and tris for this edge
int a = 0, b = 0, t0 = 0, t1 = 0;
if (mesh.GetEdge(edgeID, ref a, ref b, ref t0, ref t1) == false)
{
return(ProcessResult.Failed_NotAnEdge);
}
bool bIsBoundaryEdge = (t1 == DMesh3.InvalidID);
// look up 'other' verts c (from t0) and d (from t1, if it exists)
Index3i T0tv = mesh.GetTriangle(t0);
int c = IndexUtil.find_tri_other_vtx(a, b, T0tv);
Index3i T1tv = (bIsBoundaryEdge) ? DMesh3.InvalidTriangle : mesh.GetTriangle(t1);
int d = (bIsBoundaryEdge) ? DMesh3.InvalidID : IndexUtil.find_tri_other_vtx(a, b, T1tv);
Vector3d vA = mesh.GetVertex(a);
Vector3d vB = mesh.GetVertex(b);
double edge_len_sqr = (vA - vB).LengthSquared;
if (edge_len_sqr > MinEdgeLength * MinEdgeLength)
{
return(ProcessResult.Ignored_EdgeTooLong);
}
begin_collapse();
// check if we should collapse, and also find which vertex we should collapse to,
// in cases where we have constraints/etc
int collapse_to = -1;
bool bCanCollapse = can_collapse_constraints(edgeID, a, b, c, d, t0, t1, out collapse_to);
if (bCanCollapse == false)
{
return(ProcessResult.Ignored_Constrained);
}
// if we have a boundary, we want to collapse to boundary
if (PreserveBoundary && HaveBoundary)
{
if (collapse_to != -1)
{
if ((IsBoundaryV(b) && collapse_to != b) ||
(IsBoundaryV(a) && collapse_to != a))
{
return(ProcessResult.Ignored_Constrained);
}
}
if (IsBoundaryV(b))
{
collapse_to = b;
}
else if (IsBoundaryV(a))
{
collapse_to = a;
}
}
// optimization: if edge cd exists, we cannot collapse or flip. look that up here?
// funcs will do it internally...
// (or maybe we can collapse if cd exists? edge-collapse doesn't check for it explicitly...)
ProcessResult retVal = ProcessResult.Failed_OpNotSuccessful;
int iKeep = b, iCollapse = a;
// if either vtx is fixed, collapse to that position
if (collapse_to == b)
{
vNewPos = vB;
}
else if (collapse_to == a)
{
iKeep = a; iCollapse = b;
vNewPos = vA;
}
else
{
vNewPos = get_projected_collapse_position(iKeep, vNewPos);
}
// check if this collapse will create a normal flip. Also checks
// for invalid collapse nbrhood, since we are doing one-ring iter anyway.
// [TODO] could we skip this one-ring check in CollapseEdge? pass in hints?
if (creates_flip_or_invalid(a, b, ref vNewPos, t0, t1) || creates_flip_or_invalid(b, a, ref vNewPos, t0, t1))
{
retVal = ProcessResult.Ignored_CreatesFlip;
goto skip_to_end;
}
// lots of cases where we cannot collapse, but we should just let
// mesh sort that out, right?
COUNT_COLLAPSES++;
DMesh3.EdgeCollapseInfo collapseInfo;
MeshResult result = mesh.CollapseEdge(iKeep, iCollapse, out collapseInfo);
if (result == MeshResult.Ok)
{
collapseToV = iKeep;
mesh.SetVertex(iKeep, vNewPos);
if (constraints != null)
{
constraints.ClearEdgeConstraint(edgeID);
constraints.ClearEdgeConstraint(collapseInfo.eRemoved0);
if (collapseInfo.eRemoved1 != DMesh3.InvalidID)
{
constraints.ClearEdgeConstraint(collapseInfo.eRemoved1);
}
constraints.ClearVertexConstraint(iCollapse);
}
OnEdgeCollapse(edgeID, iKeep, iCollapse, collapseInfo);
DoDebugChecks();
retVal = ProcessResult.Ok_Collapsed;
}
skip_to_end:
end_collapse();
return(retVal);
}
private int AppendTriangle(Index3i t)
{
return(AppendTriangle(t.a, t.b, t.c));
}
public IOWriteResult Write(TextWriter writer, List <WriteMesh> vMeshes, WriteOptions options)
{
int N = vMeshes.Count;
writer.WriteLine("OFF");
string three_floats = Util.MakeVec3FormatString(0, 1, 2, options.RealPrecisionDigits);
int nTotalV = 0, nTotalT = 0, nTotalE = 0;
// OFF only supports one mesh, so have to collapse all input meshes
// into a single list, with mapping for triangles
// [TODO] can skip this if input is a single mesh!
int[][] mapV = new int[N][];
for (int mi = 0; mi < N; ++mi)
{
nTotalV += vMeshes[mi].Mesh.VertexCount;
nTotalT += vMeshes[mi].Mesh.TriangleCount;
nTotalE += 0;
mapV[mi] = new int[vMeshes[mi].Mesh.MaxVertexID];
}
writer.WriteLine(string.Format("{0} {1} {2}", nTotalV, nTotalT, nTotalE));
// write all vertices, and construct vertex re-map
int vi = 0;
for (int mi = 0; mi < N; ++mi)
{
IMesh mesh = vMeshes[mi].Mesh;
if (options.ProgressFunc != null)
{
options.ProgressFunc(mi, 2 * (N - 1));
}
foreach (int vid in mesh.VertexIndices())
{
Vector3d v = mesh.GetVertex(vid);
writer.WriteLine(three_floats, v.x, v.y, v.z);
mapV[mi][vid] = vi;
vi++;
}
}
// write all triangles
for (int mi = 0; mi < N; ++mi)
{
IMesh mesh = vMeshes[mi].Mesh;
if (options.ProgressFunc != null)
{
options.ProgressFunc(N + mi, 2 * (N - 1));
}
foreach (int ti in mesh.TriangleIndices())
{
Index3i t = mesh.GetTriangle(ti);
t[0] = mapV[mi][t[0]];
t[1] = mapV[mi][t[1]];
t[2] = mapV[mi][t[2]];
writer.WriteLine(string.Format("3 {0} {1} {2}", t[0], t[1], t[2]));
}
}
return(new IOWriteResult(IOCode.Ok, ""));
}
/// <summary>
/// Converts the provided integer vector from g3 into the OpenTK variant.
/// </summary>
/// <param name="vector">The vector to convert from its current integer variant.
/// </param>
/// <returns>An OpenTK vector to use in all calculations.</returns>
public static Vector3 VectorConvert(g3.Index3i vector)
{
return(new Vector3(vector.a, vector.b, vector.c));
}
public void BuildLinear()
{
int NV = mesh.MaxVertexID;
if (TrackVertexMapping)
{
mapTo = new Index2i[NV];
for (int i = 0; i < NV; ++i)
{
mapTo[i] = Index2i.Zero;
}
mapToMulti = new DVector <int>();
}
// temporary map from orig vertices to submesh vertices
int[] mapToCur = new int[NV];
Array.Clear(mapToCur, 0, mapToCur.Length);
int nT = mesh.MaxTriangleID;
// depending on the mesh, either the vertex count or triangle count
// could hit the upper bound first. For connected meshes we have
// NT =~ 2*NV by eulers formula, but eg for a pathological triangle
// soup mesh, we might have NV = 3*NT
int[] cur_subt = new int[MaxComponentSize]; // accumulated tris for this component
int subti = 0; // index into cur_subt
int subi = 1; // component index
// also need to make sure we don't get too many verts. To do this
// we have to keep count of how many unique verts we have accumulated.
int[] cur_subv = new int[MaxComponentSize]; // temp buffer in add_component
BitArray vert_bits = new BitArray(mesh.MaxVertexID); // which verts have we seen for this component
int subvcount = 0; // accumulated vert count for this component
Action add_component = () => {
Index2i mapRange;
int max_subv;
Component new_comp = extract_submesh(subi++, cur_subt, subti, mapToCur, cur_subv, out mapRange, out max_subv);
// [TODO] perhaps manager can request smaller chunks?
Manager.AddComponent(new_comp);
Array.Clear(cur_subt, 0, subti);
subti = 0;
Array.Clear(mapToCur, mapRange.a, mapRange.b - mapRange.a + 1);
Array.Clear(cur_subv, 0, max_subv);
subvcount = 0;
vert_bits.SetAll(false);
};
int[] tri_order = get_tri_order_by_axis_sort();
int tri_count = tri_order.Length;
for (int ii = 0; ii < tri_count; ++ii)
{
int ti = tri_order[ii];
Index3i tri = mesh.GetTriangle(ti);
if (vert_bits[tri.a] == false)
{
vert_bits[tri.a] = true; subvcount++;
}
if (vert_bits[tri.b] == false)
{
vert_bits[tri.b] = true; subvcount++;
}
if (vert_bits[tri.c] == false)
{
vert_bits[tri.c] = true; subvcount++;
}
cur_subt[subti++] = ti;
if (subti == MaxComponentSize || subvcount > MaxComponentSize - 3)
{
add_component();
}
}
if (subti > 0)
{
add_component();
}
}
