本文整理汇总了C++中Vec3r::cross方法的典型用法代码示例。如果您正苦于以下问题：C++ Vec3r::cross方法的具体用法？C++ Vec3r::cross怎么用？C++ Vec3r::cross使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Vec3r的用法示例。
在下文中一共展示了Vec3r::cross方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: intersect
/*! Intersect the line with a triangle.
\param [in] v0,v1,v2 Points definiting a triangle in CW orientation.
\param [out] t If hit, this returns the distance the hit is down the line.
\param [in,out] norm If non-NULL, this is set to the normal at the point of
intersection
\returns True if there is an intersection.
This algorithm is based on "Fast, Minimum Storage Ray/Triangle Instersection" by
T. Moeller and B. Trumbore, with the addition of avoiding the computation of
inv_det when no intersection happens.
*/
bool Line::intersect(const Pnt3r &v0,
const Pnt3r &v1,
const Pnt3r &v2,
Real &t,
Vec3r *norm) const
{
// Eps (1E-6f) didn't work with very small geometries!
static const Real sEps = 1E-10f;
// find vectors for two edges sharing v0.
Vec3r edge1 = v1 - v0;
Vec3r edge2 = v2 - v0;
// begin calculating determinant - also used to calculate U parameter.
Vec3r pvec = _dir.cross(edge2);
// if determinant is near zero, ray lies in plane of triangle.
Real det = edge1.dot(pvec);
Vec3r qvec;
if(det > sEps)
{
// calculate distance from v0 to ray origin.
Vec3r tvec = _pos - v0;
// calculate U parameter and test bounds.
Real u = tvec.dot(pvec);
if(u < 0.f || u > det)
{
return false;
}
// prepare to test V parameter.
qvec = tvec.cross(edge1);
// calculate V parameter and test bounds.
Real v = _dir.dot(qvec);
if(v < 0.f || u + v > det)
{
return false;
}
}
else if(det < -sEps)
{
// calculate distance from v0 to ray origin.
Vec3r tvec = _pos - v0;
// calculate U parameter and test bounds.
Real u = tvec.dot(pvec);
if(u > 0.f || u < det)
{
return false;
}
// prepare to test V parameter.
qvec = tvec.cross(edge1);
// calculate V parameter and test bounds.
Real v = _dir.dot(qvec);
if(v > 0.f || u + v < det)
{
return false;
}
}
else
{
return false; // ray is parallel to the plane of the triangle.
}
Real inv_det = 1.0f / det;
// calculate t, ray intersects triangle.
t = edge2.dot(qvec) * inv_det;
if(norm != NULL)
{
*norm = edge1.cross(edge2);
norm->normalize();
}
return true;
}