private static void GenerateFace(OctreeNode <NodeParms> node, MeshBuilder_IntegerVertex mb, ref Int16Triple[] tempArray, BitMap3d bmp) { InitVoxelPositionForNodeRange(node.XMin, node.XMax, node.YMin, node.YMax, node.ZMin, node.ZMax, ref tempArray); //需要找到该节点的端点位置 byte cubeConfig = 0; for (int pi = 0; pi < 8; pi++) { if (InRange(bmp, tempArray[pi].X, tempArray[pi].Y, tempArray[pi].Z) && IsWhite(bmp, tempArray[pi].X, tempArray[pi].Y, tempArray[pi].Z)) { cubeConfig |= PointIndexToFlag[pi]; } } int index = 0; while (MCTable.TriTable[cubeConfig, index] != -1) { int ei1 = MCTable.TriTable[cubeConfig, index]; int ei2 = MCTable.TriTable[cubeConfig, index + 1]; int ei3 = MCTable.TriTable[cubeConfig, index + 2]; Int16Triple p1 = GetIntersetedPointAtEdge(node, ei1, OctreeTable.NormalTypeIdToNormal[node.Parms.NormalTypeId], node.Parms.D); Int16Triple p2 = GetIntersetedPointAtEdge(node, ei2, OctreeTable.NormalTypeIdToNormal[node.Parms.NormalTypeId], node.Parms.D); Int16Triple p3 = GetIntersetedPointAtEdge(node, ei3, OctreeTable.NormalTypeIdToNormal[node.Parms.NormalTypeId], node.Parms.D); mb.AddTriangle(p1, p2, p3); index += 3; } }//对非叶子节点的超体元的抽取需要参考MCTable求取被截断边的信息
}//对非叶子节点的超体元的抽取需要参考MCTable求取被截断边的信息 private static void GenerateFaceLeaf(OctreeNode <NodeParms> node, MeshBuilder_IntegerVertex mb, ref Int16Triple[] tempArray, BitMap3d bmp) { for (int k = 0; k < 8; k++) { tempArray[k].X = node.XMin + PointIndexToPointDelta[k].X; tempArray[k].Y = node.YMin + PointIndexToPointDelta[k].Y; tempArray[k].Z = node.ZMin + PointIndexToPointDelta[k].Z; } byte value = node.Parms.Config; int index = 0; while (SMCTable.TableFat[value, index] != -1) { Int16Triple t0 = tempArray[SMCTable.TableFat[value, index]]; Int16Triple t1 = tempArray[SMCTable.TableFat[value, index + 1]]; Int16Triple t2 = tempArray[SMCTable.TableFat[value, index + 2]]; mb.AddTriangle(t0, t1, t2); index += 3; } }//对叶子节点的单位体元的抽取和SMC算法中的抽取一致