判断一个点是否在三角形区域内

float TriangleArea (float v0x, float v0y, float v1x, float v1y, float v2x, float v2y){return Mathf.Abs ((v0x * v1y + v1x * v2y + v2x * v0y- v1x * v0y - v2x * v1y - v0x * v2y) / 2f);}public bool IsINTriangle (Vector3 point, Vector3 v0, Vector3 v1, Vector3 v2){float x = point.x;float y = point.z;float v0x = v0.x;float v0y = v0.z;float v1x = v1.x;float v1y = v1.z;float v2x = v2.x;float v2y = v2.z;float t = TriangleArea (v0x, v0y, v1x, v1y, v2x, v2y);float a = TriangleArea (v0x, v0y, v1x, v1y, x, y) + TriangleArea (v0x, v0y, x, y, v2x, v2y) + TriangleArea (x, y, v1x, v1y, v2x, v2y);if (Mathf.Abs (t - a) <= 0.01f) {return true;} else {return false;}}