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