/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
**]  All rights reserved.
*
* vi:ts=4 sw=4 tw=75
*
* Distributable under the terms and conditions of the 2-clause BSD license;
* see the file COPYING for a complete text of the license.
*
**************************************************************************/

#include "Aabb.hh"
#include "Plane.hh"
#include "Sphere.hh"


namespace Mf {


Plane::Halfspace Plane::intersects(const Aabb<3>& aabb) const
{
	Vector3 corners[8];
	int nPositive = 8;

	aabb.getCorners(corners);

	for (int i = 0; i < 8; ++i)
	{
		if (intersects(corners[i]) == NEGATIVE)
		{
			--nPositive;
		}
	}

	if (nPositive == 0)      return NEGATIVE;
	else if (nPositive == 8) return POSITIVE;
	else                     return INTERSECT;
}

Plane::Halfspace Plane::intersects(const Sphere<3>& sphere) const
{
	Scalar distance = getDistanceToPoint(sphere.point);

	if (distance < -sphere.radius)     return NEGATIVE;
	else if (distance < sphere.radius) return INTERSECT;
	else                               return POSITIVE;
}


} // namespace Mf