SGRay(const SGVec3<T>& origin, const SGVec3<T>& dir) :
_origin(origin), _direction(dir)
{ }
+ template<typename S>
+ explicit SGRay(const SGRay<S>& ray) :
+ _origin(ray.getOrigin()), _direction(ray.getDirection())
+ { }
void set(const SGVec3<T>& origin, const SGVec3<T>& dir)
{ _origin = origin; _direction = dir; }