GuIntersectionRayPlane.h

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#ifndef GU_INTERSECTION_RAY_PLANE_H
#define GU_INTERSECTION_RAY_PLANE_H
 
#include "foundation/PxPlane.h"
 
namespace physx
{
namespace Gu
{
    // Returns true if line and plane are not parallel
    PX_INLINE bool intersectRayPlane(const PxVec3& orig, const PxVec3& dir, const PxPlane& plane, float& distanceAlongLine, PxVec3* pointOnPlane = NULL)
    {
        const float dn = dir.dot(plane.n);
        if(-1E-7f < dn && dn < 1E-7f)
            return false; // parallel
 
        distanceAlongLine = -plane.distance(orig)/dn;
 
        if(pointOnPlane)
            *pointOnPlane = orig + distanceAlongLine * dir;
 
        return true;
    }
 
} // namespace Gu
 
}
 
#endif