// 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);
}
/// <summary>
/// Construct vertex correspondences between fill mesh boundary loop
/// and input mesh boundary loop. In ideal case there is an easy 1-1
/// correspondence. If that is not true, then do a brute-force search
/// to find the best correspondences we can.
///
/// Currently only returns unique correspondences. If any vertex
/// matches with multiple input vertices it is not merged.
/// [TODO] we could do better in many cases...
///
/// Return value is list of indices into fillLoopV that were not merged
/// </summary>
List <int> build_merge_map(DMesh3 fillMesh, int[] fillLoopV,
DMesh3 targetMesh, int[] targetLoopV,
double tol, IndexMap mergeMapV)
{
if (fillLoopV.Length == targetLoopV.Length)
{
if (build_merge_map_simple(fillMesh, fillLoopV, targetMesh, targetLoopV, tol, mergeMapV))
{
return(null);
}
}
int NF = fillLoopV.Length, NT = targetLoopV.Length;
bool[] doneF = new bool[NF], doneT = new bool[NT];
int[] countF = new int[NF], countT = new int[NT];
var errorV = new List <int>();
var matchF = new SmallListSet(); matchF.Resize(NF);
// find correspondences
double tol_sqr = tol * tol;
for (int i = 0; i < NF; ++i)
{
if (fillMesh.IsVertex(fillLoopV[i]) == false)
{
doneF[i] = true;
errorV.Add(i);
continue;
}
matchF.AllocateAt(i);
Vector3d v = fillMesh.GetVertex(fillLoopV[i]);
for (int j = 0; j < NT; ++j)
{
Vector3d v2 = targetMesh.GetVertex(targetLoopV[j]);
if (v.DistanceSquared(ref v2) < tol_sqr)
{
matchF.Insert(i, j);
}
}
}
for (int i = 0; i < NF; ++i)
{
if (doneF[i])
{
continue;
}
if (matchF.Count(i) == 1)
{
int j = matchF.First(i);
mergeMapV[fillLoopV[i]] = targetLoopV[j];
doneF[i] = true;
}
}
for (int i = 0; i < NF; ++i)
{
if (doneF[i] == false)
{
errorV.Add(i);
}
}
return(errorV);
}
/// <summary>
/// Compute the fill mesh and append it.
/// This returns false if anything went wrong.
/// The Error Feedback properties (.OutputHasCracks, etc) will provide more info.
/// </summary>
public bool Fill()
{
compute_polygons();
// translate/scale fill loops to unit box. This will improve
// accuracy in the calcs below...
Vector2d shiftOrigin = Bounds.Center;
double scale = 1.0 / Bounds.MaxDim;
foreach (var floop in Loops)
{
floop.poly.Translate(-shiftOrigin);
floop.poly.Scale(scale * Vector2d.One, Vector2d.Zero);
}
var ElemToLoopMap = new Dictionary <PlanarComplex.Element, int>();
// [TODO] if we have multiple components in input mesh, we could do this per-component.
// This also helps avoid nested shells creating holes.
// *However*, we shouldn't *have* to because FindSolidRegions will do the right thing if
// the polygons have the same orientation
// add all loops to planar complex
var complex = new PlanarComplex();
for (int i = 0; i < Loops.Count; ++i)
{
var elem = complex.Add(Loops[i].poly);
ElemToLoopMap[elem] = i;
}
// sort into separate 2d solids
PlanarComplex.SolidRegionInfo solids =
complex.FindSolidRegions(PlanarComplex.FindSolidsOptions.SortPolygons);
// fill each 2d solid
var failed_inserts = new List <Index2i>();
var failed_merges = new List <Index2i>();
for (int fi = 0; fi < solids.Polygons.Count; ++fi)
{
var gpoly = solids.Polygons[fi];
PlanarComplex.GeneralSolid gsolid = solids.PolygonsSources[fi];
// [TODO] could do scale/translate here, per-polygon would be more precise
// generate planar mesh that we will insert polygons into
MeshGenerator meshgen;
float planeW = 1.5f;
int nDivisions = 0;
if (FillTargetEdgeLen < double.MaxValue && FillTargetEdgeLen > 0)
{
int n = (int)((planeW / (float)scale) / FillTargetEdgeLen) + 1;
nDivisions = (n <= 1) ? 0 : n;
}
if (nDivisions == 0)
{
meshgen = new TrivialRectGenerator()
{
IndicesMap = new Index2i(1, 2),
Width = planeW,
Height = planeW,
};
}
else
{
meshgen = new GriddedRectGenerator()
{
IndicesMap = new Index2i(1, 2),
Width = planeW,
Height = planeW,
EdgeVertices = nDivisions
};
}
DMesh3 FillMesh = meshgen.Generate().MakeDMesh();
FillMesh.ReverseOrientation(); // why?!?
// convenient list
var polys = new List <Polygon2d>()
{
gpoly.Outer
};
polys.AddRange(gpoly.Holes);
// for each poly, we track the set of vertices inserted into mesh
int[][] polyVertices = new int[polys.Count][];
// insert each poly
for (int pi = 0; pi < polys.Count; ++pi)
{
var insert = new MeshInsertUVPolyCurve(FillMesh, polys[pi]);
ValidationStatus status = insert.Validate(MathUtil.ZeroTolerancef * scale);
bool failed = true;
if (status == ValidationStatus.Ok)
{
if (insert.Apply())
{
insert.Simplify();
polyVertices[pi] = insert.CurveVertices;
failed = (insert.Loops.Count != 1) ||
(insert.Loops[0].VertexCount != polys[pi].VertexCount);
}
}
if (failed)
{
failed_inserts.Add(new Index2i(fi, pi));
}
}
// remove any triangles not contained in gpoly
// [TODO] degenerate triangle handling? may be 'on' edge of gpoly...
var removeT = new List <int>();
foreach (int tid in FillMesh.TriangleIndices())
{
Vector3d v = FillMesh.GetTriCentroid(tid);
if (gpoly.Contains(v.xy) == false)
{
removeT.Add(tid);
}
}
foreach (int tid in removeT)
{
FillMesh.RemoveTriangle(tid, true, false);
}
//Util.WriteDebugMesh(FillMesh, "c:\\scratch\\CLIPPED_MESH.obj");
// transform fill mesh back to 3d
MeshTransforms.PerVertexTransform(FillMesh, (v) =>
{
Vector2d v2 = v.xy;
v2 /= scale;
v2 += shiftOrigin;
return(to3D(v2));
});
//Util.WriteDebugMesh(FillMesh, "c:\\scratch\\PLANAR_MESH_WITH_LOOPS.obj");
//Util.WriteDebugMesh(MeshEditor.Combine(FillMesh, Mesh), "c:\\scratch\\FILLED_MESH.obj");
// figure out map between new mesh and original edge loops
// [TODO] should check that edges (ie sequential verts) are boundary edges on fill mesh
// if not, can try to delete nbr tris to repair
var mergeMapV = new IndexMap(true);
if (MergeFillBoundary)
{
for (int pi = 0; pi < polys.Count; ++pi)
{
if (polyVertices[pi] == null)
{
continue;
}
int[] fillLoopVerts = polyVertices[pi];
int NV = fillLoopVerts.Length;
PlanarComplex.Element sourceElem = (pi == 0) ? gsolid.Outer : gsolid.Holes[pi - 1];
int loopi = ElemToLoopMap[sourceElem];
EdgeLoop sourceLoop = Loops[loopi].edgeLoop;
// construct vertex-merge map for this loop
List <int> bad_indices = build_merge_map(FillMesh, fillLoopVerts, Mesh, sourceLoop.Vertices,
MathUtil.ZeroTolerancef, mergeMapV);
bool errors = (bad_indices != null && bad_indices.Count > 0);
if (errors)
{
failed_inserts.Add(new Index2i(fi, pi));
OutputHasCracks = true;
}
}
}
// append this fill to input mesh
var editor = new MeshEditor(Mesh);
int[] mapV;
editor.AppendMesh(FillMesh, mergeMapV, out mapV, Mesh.AllocateTriangleGroup());
// [TODO] should verify that we actually merged all the loops. If there are bad_indices
// we could fill them
}
FailedInsertions = failed_inserts.Count;
FailedMerges = failed_merges.Count;
if (failed_inserts.Count > 0 || failed_merges.Count > 0)
{
return(false);
}
return(true);
}
public IOWriteResult Write(TextWriter writer, List <WriteMesh> vMeshes, WriteOptions options)
{
if (options.groupNamePrefix != null)
{
GroupNamePrefix = options.groupNamePrefix;
}
if (options.GroupNameF != null)
{
GroupNameF = options.GroupNameF;
}
int nAccumCountV = 1; // OBJ indices always start at 1
int nAccumCountUV = 1;
// collect materials
string sMaterialLib = "";
int nHaveMaterials = 0;
if (options.bWriteMaterials && options.MaterialFilePath.Length > 0)
{
List <GenericMaterial> vMaterials = MeshIOUtil.FindUniqueMaterialList(vMeshes);
IOWriteResult ok = write_materials(vMaterials, options);
if (ok.code == IOCode.Ok)
{
sMaterialLib = Path.GetFileName(options.MaterialFilePath);
nHaveMaterials = vMeshes.Count;
}
}
if (options.AsciiHeaderFunc != null)
{
writer.WriteLine(options.AsciiHeaderFunc());
}
if (sMaterialLib != "")
{
writer.WriteLine("mtllib {0}", sMaterialLib);
}
for (int mi = 0; mi < vMeshes.Count; ++mi)
{
IMesh mesh = vMeshes[mi].Mesh;
bool bVtxColors = options.bPerVertexColors && mesh.HasVertexColors;
bool bNormals = options.bPerVertexNormals && mesh.HasVertexNormals;
// use separate UV set if we have it, otherwise write per-vertex UVs if we have those
bool bVtxUVs = options.bPerVertexUVs && mesh.HasVertexUVs;
if (vMeshes[mi].UVs != null)
{
bVtxUVs = false;
}
int[] mapV = new int[mesh.MaxVertexID];
// write vertices for this mesh
foreach (int vi in mesh.VertexIndices())
{
mapV[vi] = nAccumCountV++;
Vector3d v = mesh.GetVertex(vi);
if (bVtxColors)
{
Vector3d c = mesh.GetVertexColor(vi);
writer.WriteLine("v {0} {1} {2} {3:F8} {4:F8} {5:F8}", v[0], v[1], v[2], c[0], c[1], c[2]);
}
else
{
writer.WriteLine("v {0} {1} {2}", v[0], v[1], v[2]);
}
if (bNormals)
{
Vector3d n = mesh.GetVertexNormal(vi);
writer.WriteLine("vn {0:F10} {1:F10} {2:F10}", n[0], n[1], n[2]);
}
if (bVtxUVs)
{
Vector2f uv = mesh.GetVertexUV(vi);
writer.WriteLine("vt {0:F10} {1:F10}", uv.x, uv.y);
}
}
// write independent UVs for this mesh, if we have them
IIndexMap mapUV = (bVtxUVs) ? new IdentityIndexMap() : null;
DenseUVMesh uvSet = null;
if (vMeshes[mi].UVs != null)
{
uvSet = vMeshes[mi].UVs;
int nUV = uvSet.UVs.Length;
IndexMap fullMap = new IndexMap(false, nUV); // [TODO] do we really need a map here? is just integer shift, no?
for (int ui = 0; ui < nUV; ++ui)
{
writer.WriteLine("vt {0:F8} {1:F8}", uvSet.UVs[ui].x, uvSet.UVs[ui].y);
fullMap[ui] = nAccumCountUV++;
}
mapUV = fullMap;
}
// check if we need to write usemtl lines for this mesh
bool bWriteMaterials = nHaveMaterials > 0 &&
vMeshes[mi].TriToMaterialMap != null &&
vMeshes[mi].Materials != null;
// various ways we can write triangles to minimize state changes...
// [TODO] support writing materials when mesh has groups!!
if (options.bWriteGroups && mesh.HasTriangleGroups)
{
write_triangles_bygroup(writer, mesh, mapV, uvSet, mapUV, bNormals);
}
else
{
write_triangles_flat(writer, vMeshes[mi], mapV, uvSet, mapUV, bNormals, bWriteMaterials);
}
}
return(new IOWriteResult(IOCode.Ok, ""));
}
public bool Fill()
{
compute_polygon();
// translate/scale fill loops to unit box. This will improve
// accuracy in the calcs below...
Vector2d shiftOrigin = Bounds.Center;
double scale = 1.0 / Bounds.MaxDim;
SpansPoly.Translate(-shiftOrigin);
SpansPoly.Scale(scale * Vector2d.One, Vector2d.Zero);
Dictionary <PlanarComplex.Element, int> ElemToLoopMap = new Dictionary <PlanarComplex.Element, int>();
// generate planar mesh that we will insert polygons into
MeshGenerator meshgen;
float planeW = 1.5f;
int nDivisions = 0;
if (FillTargetEdgeLen < double.MaxValue && FillTargetEdgeLen > 0)
{
int n = (int)((planeW / (float)scale) / FillTargetEdgeLen) + 1;
nDivisions = (n <= 1) ? 0 : n;
}
if (nDivisions == 0)
{
meshgen = new TrivialRectGenerator()
{
IndicesMap = new Index2i(1, 2), Width = planeW, Height = planeW,
};
}
else
{
meshgen = new GriddedRectGenerator()
{
IndicesMap = new Index2i(1, 2), Width = planeW, Height = planeW,
EdgeVertices = nDivisions
};
}
DMesh3 FillMesh = meshgen.Generate().MakeDMesh();
FillMesh.ReverseOrientation(); // why?!?
int[] polyVertices = null;
// insert each poly
MeshInsertUVPolyCurve insert = new MeshInsertUVPolyCurve(FillMesh, SpansPoly);
ValidationStatus status = insert.Validate(MathUtil.ZeroTolerancef * scale);
bool failed = true;
if (status == ValidationStatus.Ok)
{
if (insert.Apply())
{
insert.Simplify();
polyVertices = insert.CurveVertices;
failed = false;
}
}
if (failed)
{
return(false);
}
// remove any triangles not contained in gpoly
// [TODO] degenerate triangle handling? may be 'on' edge of gpoly...
List <int> removeT = new List <int>();
foreach (int tid in FillMesh.TriangleIndices())
{
Vector3d v = FillMesh.GetTriCentroid(tid);
if (SpansPoly.Contains(v.xy) == false)
{
removeT.Add(tid);
}
}
foreach (int tid in removeT)
{
FillMesh.RemoveTriangle(tid, true, false);
}
//Util.WriteDebugMesh(FillMesh, "c:\\scratch\\CLIPPED_MESH.obj");
// transform fill mesh back to 3d
MeshTransforms.PerVertexTransform(FillMesh, (v) => {
Vector2d v2 = v.xy;
v2 /= scale;
v2 += shiftOrigin;
return(to3D(v2));
});
//Util.WriteDebugMesh(FillMesh, "c:\\scratch\\PLANAR_MESH_WITH_LOOPS.obj");
//Util.WriteDebugMesh(MeshEditor.Combine(FillMesh, Mesh), "c:\\scratch\\FILLED_MESH.obj");
// figure out map between new mesh and original edge loops
// [TODO] if # of verts is different, we can still find correspondence, it is just harder
// [TODO] should check that edges (ie sequential verts) are boundary edges on fill mesh
// if not, can try to delete nbr tris to repair
IndexMap mergeMapV = new IndexMap(true);
if (MergeFillBoundary && polyVertices != null)
{
throw new NotImplementedException("PlanarSpansFiller: merge fill boundary not implemented!");
//int[] fillLoopVerts = polyVertices;
//int NV = fillLoopVerts.Length;
//PlanarComplex.Element sourceElem = (pi == 0) ? gsolid.Outer : gsolid.Holes[pi - 1];
//int loopi = ElemToLoopMap[sourceElem];
//EdgeLoop sourceLoop = Loops[loopi].edgeLoop;
//for (int k = 0; k < NV; ++k) {
// Vector3d fillV = FillMesh.GetVertex(fillLoopVerts[k]);
// Vector3d sourceV = Mesh.GetVertex(sourceLoop.Vertices[k]);
// if (fillV.Distance(sourceV) < MathUtil.ZeroTolerancef)
// mergeMapV[fillLoopVerts[k]] = sourceLoop.Vertices[k];
//}
}
// append this fill to input mesh
MeshEditor editor = new MeshEditor(Mesh);
int[] mapV;
editor.AppendMesh(FillMesh, mergeMapV, out mapV, Mesh.AllocateTriangleGroup());
// [TODO] should verify that we actually merged the loops...
return(true);
}
public virtual bool Extrude()
{
MeshNormals normals = null;
bool bHaveNormals = Mesh.HasVertexNormals;
if (!bHaveNormals)
{
normals = new MeshNormals(Mesh);
normals.Compute();
}
InitialLoops = new MeshBoundaryLoops(Mesh);
InitialTriangles = Mesh.TriangleIndices().ToArray();
InitialVertices = Mesh.VertexIndices().ToArray();
// duplicate triangles of mesh
InitialToOffsetMapV = new IndexMap(Mesh.MaxVertexID, Mesh.MaxVertexID);
OffsetGroupID = OffsetGroup.GetGroupID(Mesh);
var editor = new MeshEditor(Mesh);
OffsetTriangles = editor.DuplicateTriangles(InitialTriangles, ref InitialToOffsetMapV, OffsetGroupID);
// set vertices to new positions
foreach (int vid in InitialVertices)
{
int newvid = InitialToOffsetMapV[vid];
if (!Mesh.IsVertex(newvid))
{
continue;
}
Vector3d v = Mesh.GetVertex(vid);
Vector3f n = (bHaveNormals) ? Mesh.GetVertexNormal(vid) : (Vector3f)normals.Normals[vid];
Vector3d newv = ExtrudedPositionF(v, n, vid);
Mesh.SetVertex(newvid, newv);
}
// we need to reverse one side
if (IsPositiveOffset)
{
editor.ReverseTriangles(InitialTriangles);
}
else
{
editor.ReverseTriangles(OffsetTriangles);
}
// stitch each loop
NewLoops = new EdgeLoop[InitialLoops.Count];
StitchTriangles = new int[InitialLoops.Count][];
StitchGroupIDs = new int[InitialLoops.Count];
int li = 0;
foreach (var loop in InitialLoops)
{
int[] loop2 = new int[loop.VertexCount];
for (int k = 0; k < loop2.Length; ++k)
{
loop2[k] = InitialToOffsetMapV[loop.Vertices[k]];
}
StitchGroupIDs[li] = StitchGroups.GetGroupID(Mesh);
if (IsPositiveOffset)
{
StitchTriangles[li] = editor.StitchLoop(loop2, loop.Vertices, StitchGroupIDs[li]);
}
else
{
StitchTriangles[li] = editor.StitchLoop(loop.Vertices, loop2, StitchGroupIDs[li]);
}
NewLoops[li] = EdgeLoop.FromVertices(Mesh, loop2);
li++;
}
return(true);
}