physics/Sphere

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/****************************************************************************
  Copyright (C)1996 David Jung <opensim@pobox.com>

  This program/file is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details. (http://www.gnu.org)
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  $Id: Sphere 1031 2004-02-11 20:46:36Z jungd $
  $Revision: 1.4 $
  $Date: 2004-02-11 15:46:36 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

#ifndef _PHYSICS_SPHERE_
#define _PHYSICS_SPHERE_

#include <base/base>
#include <physics/ConvexShape>
#include <base/Dimension3>


namespace physics {


class Sphere : virtual public ConvexShape
{
public:
  Sphere();
  explicit Sphere(Real radius);
  Sphere(const Sphere& s);
  virtual ~Sphere();
  
  virtual String className() const { return String("Sphere"); }

  Real radius() const { return _radius; }
  
  // Shape
  virtual base::Object& clone() const { return *NewNamedObj(className()) Sphere(*this); }
  virtual BoundingBox    getBoundingBox() const { return BoundingBox(-gfx::Point3(_radius,_radius,_radius), gfx::Point3(_radius,_radius,_radius)); }
  virtual BoundingSphere getBoundingSphere() const { return BoundingSphere(gfx::Point3(),_radius); }
  virtual const MassProperties& getMassProperties(ref<const Material> material) const; 

  virtual gfx::Segment3 shortestSegmentBetween(const base::Transform& t, const Point3& p) const;
  virtual gfx::Segment3 shortestSegmentBetween(const base::Transform& t, const gfx::Segment3& s) const;
  virtual gfx::Segment3 shortestSegmentBetween(const base::Transform& t, const gfx::Triangle3& tri) const;
  virtual gfx::Segment3 shortestSegmentBetween(const base::Transform& t, const gfx::Quad3& q) const;
  virtual gfx::Segment3 shortestSegmentBetween(const base::Transform& t1, ref<const Shape> s, const base::Transform& t2) const;

  // ConvexShape
  virtual base::Point3 support(const base::Vector3& v) const;
  
  // CollisionModelProvider
  virtual ref<CollisionModel> getCollisionModel(CollisionModel::CollisionModelType modelType) const;

  // Visual
  virtual bool visualTypeSupported(VisualType type) const { return (type==OSGVisual); }
  virtual osg::Node* createOSGVisual(Attributes visualAttributes=0) const;

  virtual void serialize(base::Serializer& s);
  
  // Externalizable
  virtual bool formatSupported(String format, Real version = 1.0, ExternalizationType type = IO) const;
  virtual void externalize(base::Externalizer& e, String format = "", Real version = 1.0);
  virtual void externalize(base::Externalizer& e, String format = "", Real version = 1.0) const
    { Externalizable::externalize(e,format,version); }

protected:
  osg::Node* createOSGSphere(Visual::Attributes visualAttributes, Int slices) const;

private:
  Real _radius;

  mutable bool massPropertiesCached;
  mutable Real density;
  mutable MassProperties massProperties;

  mutable Visual::Attributes attributes;
  mutable ref_ptr<osg::Node> node;

  mutable ref<CollisionModel> collisionModel;
  mutable CollisionModel::CollisionModelType modelType;
};


} // physics

#endif

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