bool Ray::GetIntersection(const Triangle &triangle, float &t) const
{
float u, v, w;
glm::vec3 pa = triangle[0] - mOrigin;
glm::vec3 pb = triangle[1] - mOrigin;
glm::vec3 pc = triangle[2] - mOrigin;
glm::vec3 m = glm::cross(mDirection, pc);
u = glm::dot(pb, m);
v = -glm::dot(pa, m);
if(glm::sign(u) != glm::sign(v)) {
return false;
}
w = MathUtil::ScalarTriple(mDirection, pb, pa);
if(glm::sign(u) != glm::sign(w)) {
return false;
}
float denom = 1.0f / (u + v + w);
u *= denom;
v *= denom;
w *= denom;
glm::vec3 point = triangle.BarycentricPoint(u, v, w);
t = glm::dot((point - mOrigin), mDirection);
if(t >= 0) {
return true;
}
return false;
}
