/// <summary>
/// 判断点pt是否在多边形中
/// </summary>
/// <param name="poly">多边形</param>
/// <param name="polyFaceNormal"></param>
/// <param name="pt"></param>
/// <returns></returns>
public bool IsInsidePolyEx(Poly poly, Vector3d pt, PloySideType checkSideType = PloySideType.Allside)
{
PolySide[] polySides = poly.sidesList[0];
Vector3d n = Vector3d.Cross(pt - polySides[0].startpos, polySides[0].dir);
if (!IsZero(n) || !IsParallel(n, poly.faceNormal))
{
return(false);
}
return(IsInsidePoly(poly, pt, checkSideType));
}
/// <summary>
/// 判断点pointMustInPloyPlane是否在多边形中,
/// pointMustInPloyPlane必须在多边形的同一平面中,但不一定在多边形中
/// </summary>
/// <param name="polySides">多边形中所有点共面</param>
/// <param name="pointMustInPloyPlane"></param>
/// <returns></returns>
public bool IsInsidePoly(Poly poly, Vector3d pointMustInPloyPlane, PloySideType checkSideType = PloySideType.Allside)
{
PolySide[] polySides;
List <PolySide[]> polySidesList = poly.sidesList;
Vector3d pt = pointMustInPloyPlane;
Vector3d polyFaceNormal = poly.faceNormal;
//判断从点引出的平行于sides[0]方向的正向射线是否与其它边相交
Vector3d n = polySidesList[0][0].startpos - pt;
int crossPtCount = 0;
Vector3d crossPt;
PolySide polySide2 = new PolySide();
polySide2.startpos = pt;
polySide2.dir = n;
polySide2.step = 1000000;
for (int j = 0; j < polySidesList.Count; j++)
{
if (checkSideType == PloySideType.Outside)
{
if (j == 1)
{
break;
}
}
else if (checkSideType == PloySideType.Inside)
{
if (j == 0)
{
continue;
}
}
polySides = polySidesList[j];
for (int i = 0; i < polySides.Length; i++)
{
crossPtCount += SolvePolySideCrossPoint(polySides[i], polySide2, polyFaceNormal, true, out crossPt);
}
}
//判断是偶数个交点，还是奇数个交点
if (crossPtCount % 2 == 0)
{
return(false);
}
return(true);
}
