SmoothingVisitor

/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGUTIL_SMOOTHINGVISITOR
#define OSGUTIL_SMOOTHINGVISITOR 1

#include <osg/NodeVisitor>
#include <osg/Geode>
#include <osg/Geometry>

#include <osgUtil/Export>

namespace osgUtil {

/** A smoothing visitor for calculating smoothed normals for
  * osg::GeoSet's which contains surface primitives.
  */
class OSGUTIL_EXPORT SmoothingVisitor : public osg::NodeVisitor
{
    public:

        /// default to traversing all children.
        SmoothingVisitor();
        virtual ~SmoothingVisitor();
        
        /// smooth geoset by creating per vertex normals.
        static void smooth(osg::Geometry& geoset, double creaseAngle=osg::PI);

        /// apply smoothing method to all geode geosets.
        virtual void apply(osg::Geode& geode);

        /// set the maximum angle, in radians, at which angle between adjacent triangles that normals are smoothed
        /// for edges that greater the shared vertices are duplicated
        void setCreaseAngle(double angle) { _creaseAngle = angle; }
        double getCreaseAngle() const { return _creaseAngle; }

    protected:

        double _creaseAngle;

};

}

#endif