godot/thirdparty/thekla_atlas/nvmath/Plane.cpp

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// This code is in the public domain -- castanyo@yahoo.es
#include "Plane.h"
#include "Plane.inl"
#include "Matrix.inl"
namespace nv
{
Plane transformPlane(const Matrix & m, const Plane & p)
{
Vector3 newVec = transformVector(m, p.vector());
Vector3 ptInPlane = p.offset() * p.vector();
ptInPlane = transformPoint(m, ptInPlane);
return Plane(newVec, ptInPlane);
}
Vector3 planeIntersection(const Plane & a, const Plane & b, const Plane & c)
{
return dot(a.vector(), cross(b.vector(), c.vector())) * (
a.offset() * cross(b.vector(), c.vector()) +
c.offset() * cross(a.vector(), b.vector()) +
b.offset() * cross(c.vector(), a.vector()));
}
} // nv namespace