public static void QuickCompute(DMesh3 mesh)
{
MeshNormals normals = new MeshNormals(mesh);
normals.Compute();
normals.CopyTo(mesh);
}
// transfer vertex positions in submesh back to base mesh
public bool BackPropropagateVertices(bool bRecomputeBoundaryNormals = false)
{
bool bNormals = (Region.SubMesh.HasVertexNormals && Region.BaseMesh.HasVertexNormals);
foreach (int subvid in Region.SubMesh.VertexIndices())
{
int basevid = Region.SubToBaseV[subvid];
Vector3d v = Region.SubMesh.GetVertex(subvid);
Region.BaseMesh.SetVertex(basevid, v);
if (bNormals)
{
Region.BaseMesh.SetVertexNormal(basevid, Region.SubMesh.GetVertexNormal(subvid));
}
}
if (bRecomputeBoundaryNormals)
{
foreach (int basevid in Region.BaseBorderV)
{
Vector3d n = MeshNormals.QuickCompute(Region.BaseMesh, basevid);
Region.BaseMesh.SetVertexNormal(basevid, (Vector3f)n);
}
}
return(true);
}
public virtual bool Extrude()
{
MeshEditor editor = new MeshEditor(Mesh);
editor.SeparateTriangles(Triangles, true, out EdgePairs);
MeshNormals normals = null;
bool bHaveNormals = Mesh.HasVertexNormals;
if (!bHaveNormals)
{
normals = new MeshNormals(Mesh);
normals.Compute();
}
ExtrudeVertices = new MeshVertexSelection(Mesh);
ExtrudeVertices.SelectTriangleVertices(Triangles);
Vector3d[] NewVertices = new Vector3d[ExtrudeVertices.Count];
int k = 0;
foreach (int vid in ExtrudeVertices)
{
Vector3d v = Mesh.GetVertex(vid);
Vector3f n = (bHaveNormals) ? Mesh.GetVertexNormal(vid) : (Vector3f)normals.Normals[vid];
NewVertices[k++] = ExtrudedPositionF(v, n, vid);
}
k = 0;
foreach (int vid in ExtrudeVertices)
{
Mesh.SetVertex(vid, NewVertices[k++]);
}
SetGroupID = Group.GetGroupID(Mesh);
JoinTriangles = editor.StitchUnorderedEdges(EdgePairs, SetGroupID);
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);
}