我使用的平面是从三角形的法线和顶点派生出来的。无论交点是否位于我用来派生平面的三角形上,我都希望找到在平面上的交点位置。
该函数的参数如下:
contact = the contact point on the plane, this is what i want calculated
ray = B - A, simply the line from A to B
rayOrigin = A, the origin of the line segement
normal = normal of the plane (normal of a triangle)
coord = a point on the plane (vertice of a triangle)
以下是我使用的代码:
bool linePlaneIntersection(Vector& contact, Vector ray, Vector rayOrigin, Vector normal, Vector coord) {
// calculate plane
float d = Dot(normal, coord);
if (Dot(normal, ray)) {
return false; // avoid divide by zero
}
// Compute the t value for the directed line ray intersecting the plane
float t = (d - Dot(normal, rayOrigin)) / Dot(normal, ray);
// scale the ray by t
Vector newRay = ray * t;
// calc contact point
contact = rayOrigin + newRay;
if (t >= 0.0f && t <= 1.0f) {
return true; // line intersects plane
}
return false; // line does not
}
在我的测试中,它从未返回true... 有什么想法吗?