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bugfix fails to check if point in triangle. 

Signed-off-by: Jackie9527 <80555200+Jackie9527@users.noreply.github.com>
pull/4981/head
Jackie9527 2023-02-25 10:10:35 +08:00
parent 46ae8534f7
commit 437958ef91
1 changed files with 2 additions and 20 deletions
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22
code/Common/PolyTools.h
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@ -74,26 +74,8 @@ inline bool OnLeftSideOfLine2D(const T& p0, const T& p1,const T& p2) {
* both aiVector3D and aiVector2D, but generally ignores the third coordinate.*/
template <typename T>
inline bool PointInTriangle2D(const T& p0, const T& p1,const T& p2, const T& pp) {
// Point in triangle test using baryzentric coordinates
const aiVector2D v0 = p1 - p0;
const aiVector2D v1 = p2 - p0;
const aiVector2D v2 = pp - p0;
double dot00 = v0 * v0;
double dot11 = v1 * v1;
const double dot01 = v0 * v1;
const double dot02 = v0 * v2;
const double dot12 = v1 * v2;
const double denom = dot00 * dot11 - dot01 * dot01;
if (denom == 0.0) {
return false;
}
const double invDenom = 1.0 / denom;
dot11 = (dot11 * dot02 - dot01 * dot12) * invDenom;
dot00 = (dot00 * dot12 - dot01 * dot02) * invDenom;
return (dot11 > 0) && (dot00 > 0) && (dot11 + dot00 < 1);
// pp should be left side of the three triangle side, by ccw arrow
return OnLeftSideOfLine2D(p0, p1, pp) && OnLeftSideOfLine2D(p1, p2, pp) && OnLeftSideOfLine2D(p2, p0, pp);
}