2001-10-04 23:12:57 +08:00
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//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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2001-09-20 05:19:47 +08:00
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#ifndef OSGUTIL_INSERTIMPOSTORSVISITOR
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#define OSGUTIL_INSERTIMPOSTORSVISITOR
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#include <osg/NodeVisitor>
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#include <osg/Impostor>
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#include <osgUtil/Export>
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namespace osgUtil {
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/** Insert impostor nodes into scene graph.
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* For example of usage see src/Demos/osgimpostor.
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*/
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class OSGUTIL_EXPORT InsertImpostorsVisitor : public osg::NodeVisitor
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{
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public:
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/// default to traversing all children.
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InsertImpostorsVisitor();
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void setImpostorThresholdRatio(const float ratio) { _impostorThresholdRatio = ratio; }
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const float getImpostorThresholdRatio() const { return _impostorThresholdRatio; }
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void setMaximumNumberOfNestedImpostors(const unsigned int num) { _maximumNumNestedImpostors = num; }
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const unsigned int getMaximumNumberOfNestedImpostors() const { return _maximumNumNestedImpostors; }
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/** empty visitor, make it ready for next traversal.*/
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void reset();
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virtual void apply(osg::Node& node);
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virtual void apply(osg::Group& node);
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virtual void apply(osg::LOD& node);
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virtual void apply(osg::Impostor& node);
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/* insert the required impostors into the scene graph.*/
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void insertImpostors();
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protected:
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typedef std::vector< osg::Group* > GroupList;
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typedef std::vector< osg::LOD* > LODList;
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GroupList _groupList;
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LODList _lodList;
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float _impostorThresholdRatio;
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unsigned int _maximumNumNestedImpostors;
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unsigned int _numNestedImpostors;
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};
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};
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#endif
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