aabb_3d_sphere_3d.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
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 *  GNU General Public License Version 2 or later (the GPL), in which case the 
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 *  *** END LICENSE INFORMATION ***
 */

#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_AABB_3D_SPHERE_3D_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_AABB_3D_SPHERE_3D_H

#include "prim_common.h"
#include "aabb_3d.h"
#include "sphere_3d.h"

namespace lass
{
namespace prim
{

/** @relates lass::prim::Sphere3D
 *  @sa lass::prim::Aabb3D
 */
template <typename T> 
Aabb3D<T> aabb(const Sphere3D<T>& sphere)
{
    const typename Sphere3D<T>::TPoint& c = sphere.center();
    const typename Sphere3D<T>::TValue r = sphere.radius();
    const Vector3D<T> extent(r, r, r);
    return Aabb3D<T>(c - extent, c + extent);
}



/** @relates lass::prim::Aabb3D
 *  @sa lass::prim::Sphere3D
 */
template <typename T, typename MMP>
Sphere3D<T> boundingSphere(const Aabb3D<T, MMP>& box)
{
    const typename Aabb3D<T, MMP>::TPoint center = box.center().affine();
    const typename Aabb3D<T, MMP>::TValue radius = box.size().norm() / 2;
    return Sphere3D<T>(center, radius);
}



/** @relates lass::prim::Aabb3D
 *  @sa lass::prim::Sphere3D
 */
template <typename T, typename MMP>
const bool intersects(const Aabb3D<T, MMP>& aabb, const Sphere3D<T>& sphere)
{
    typedef typename Sphere3D<T>::TPoint TPoint;
    typedef typename Sphere3D<T>::TVector TVector;
    const TVector dist = pointwiseMax(aabb.min() - sphere.center(), sphere.center() - aabb.max());
    return pointwiseMax(dist, TVector()).squaredNorm() <= num::sqr(sphere.radius());
}



/** @relates lass::prim::Sphere3D
 *  @sa lass::prim::Aabb3D
 */
template <typename T, typename MMP>
const bool intersects(const Sphere3D<T>& sphere, const Aabb3D<T, MMP>& aabb)
{
    return intersects(aabb, sphere);
}



/** @relates lass::prim::Aabb3D
 *  @sa lass::prim::Sphere3D
 */
template <typename T, typename MMP>
const bool collides(const Aabb3D<T, MMP>& aabb, const Sphere3D<T>& sphere)
{
    typedef typename Sphere3D<T>::TPoint TPoint;
    typedef typename Sphere3D<T>::TVector TVector;
    const TVector dist = pointwiseMax(aabb.min() - sphere.center(), sphere.center() - aabb.max());
    return pointwiseMax(dist, TVector()).squaredNorm() < num::sqr(sphere.radius());
}



/** @relates lass::prim::Sphere3D
 *  @sa lass::prim::Aabb3D
 */
template <typename T, typename MMP>
const bool collides(const Sphere3D<T>& sphere, const Aabb3D<T, MMP>& aabb)
{
    return collides(aabb, sphere);
}



}
}

#endif

// EOF