private void SplitThreePart(ref TriangleFace triangleFace, ref Stack <TriangleFace> faceStack)
{
Vector3 barycentric;
triangleFace.ComputeBarycentric(out barycentric);
VertexData newPointData = triangleFace.Interlopation(barycentric, true, true);
faceStack.Push(new TriangleFace(triangleFace.pointA, triangleFace.pointB, newPointData));
faceStack.Push(new TriangleFace(triangleFace.pointB, triangleFace.pointC, newPointData));
faceStack.Push(new TriangleFace(triangleFace.pointC, triangleFace.pointA, newPointData));
}
/// <summary>
/// 切割后的三角形面积会小于areaUnit
/// </summary>
/// <param name="areaUnit"></param>
/// <returns></returns>
public void SplitByArea(ref TriangleFace triangleFace)
{
Stack <TriangleFace> faceStack = new Stack <TriangleFace>();
faceStack.Push(triangleFace);
float areaUnitLocal = areaUnit;
if (infectedByCrossPoint)
{
Vector3 barycentric;
triangleFace.ComputeBarycentric(out barycentric);
areaUnitLocal = areaUnit * (crossPoint - barycentric).magnitude / distance2CrossPointPer;
if (limitAreaUnit)
{
if (maxAreaUnit < minAreaUnit)
{
maxAreaUnit = minAreaUnit;
}
if (areaUnitLocal > maxAreaUnit)
{
areaUnitLocal = maxAreaUnit;
}
else if (areaUnitLocal < minAreaUnit)
{
areaUnitLocal = minAreaUnit;
}
}
}
while (faceStack.Count > 0)
{
var curFace = faceStack.Pop();
float triangleArea = ComputeArea(ref curFace);
int count = (int)(triangleArea / areaUnitLocal) + 1;
if (count <= 1)
{
splitTriangleFace.Add(curFace);
triangleAreaList.Add(triangleArea);
continue;
}
//能整除的优先
if ((cutToPiecesPerTime & CutToPiecesPerTime.CutToFour) == CutToPiecesPerTime.CutToFour && count % 4 == 0)
{
SplitFourPart(ref curFace, ref faceStack);
}
else if ((cutToPiecesPerTime & CutToPiecesPerTime.CutToThree) == CutToPiecesPerTime.CutToThree && count % 3 == 0)
{
SplitThreePart(ref curFace, ref faceStack);
}
else if ((cutToPiecesPerTime & CutToPiecesPerTime.CutToTwo) == CutToPiecesPerTime.CutToTwo && count % 2 == 0)
{
SplitTwoPart(ref curFace, ref faceStack);
}
else
{
//优先级2》3》4
if ((cutToPiecesPerTime & CutToPiecesPerTime.CutToTwo) == CutToPiecesPerTime.CutToTwo && count / 2 > 0)
{
SplitTwoPart(ref curFace, ref faceStack);
}
else if ((cutToPiecesPerTime & CutToPiecesPerTime.CutToThree) == CutToPiecesPerTime.CutToThree && count / 3 > 0)
{
SplitThreePart(ref curFace, ref faceStack);
}
else
{
SplitFourPart(ref curFace, ref faceStack);
}
}
}
}