public virtual bool Extrude(int group_id = -1) { // duplicate loop vertices int NV = Loop.Vertices.Length; NewLoop = new EdgeLoop(Mesh); NewLoop.Vertices = new int[NV]; for (int i = 0; i < NV; ++i) { int vid = Loop.Vertices[i]; NewLoop.Vertices[i] = Mesh.AppendVertex(Mesh, vid); } // move to offset positions for (int i = 0; i < NV; ++i) { Vector3d v = Mesh.GetVertex(Loop.Vertices[i]); Vector3f n = Mesh.GetVertexNormal(Loop.Vertices[i]); Vector3d new_v = PositionF(v, n, i); Mesh.SetVertex(NewLoop.Vertices[i], new_v); } // stitch interior MeshEditor edit = new MeshEditor(Mesh); NewTriangles = edit.StitchLoop(Loop.Vertices, NewLoop.Vertices, group_id); 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); }