77 lines
3.0 KiB
C++
77 lines
3.0 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGSIM_VISIBILITYGROUP
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#define OSGSIM_VISIBILITYGROUP 1
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#include <osg/Node>
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#include <osg/Group>
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#include <osg/NodeVisitor>
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#include <osgSim/Export>
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namespace osgSim {
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/** VisibilityGroup renders (traverses) it's children only when the camera is inside a specified visibility volume.
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* The visibility volume is intersected with a line segment that extends from
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* the current camera's eye-point along the view vector for a given segment length.
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* If an intersection is detected then the node's children are traversed.
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*/
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class OSGSIM_EXPORT VisibilityGroup : public osg::Group
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{
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public :
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VisibilityGroup();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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VisibilityGroup(const VisibilityGroup&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
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META_Node(osgSim, VisibilityGroup);
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virtual void traverse(osg::NodeVisitor& nv);
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/** Set the subgraph that is intersected for the visibility determination.*/
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void setVisibilityVolume(osg::Node* node) { _visibilityVolume = node; }
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/** Get the subgraph that is intersected for the visibility determination.*/
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osg::Node* getVisibilityVolume() { return _visibilityVolume.get(); }
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/** Get the const subgraph that is intersected for the visibility determination.*/
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const osg::Node* getVisibilityVolume() const { return _visibilityVolume.get(); }
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/** Set the traversal mask for the intersection testing.*/
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void setVolumeIntersectionMask(osg::Node::NodeMask mask) { _volumeIntersectionMask = mask; }
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/** Get the traversal mask for the intersection testing.*/
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osg::Node::NodeMask getVolumeIntersectionMask() const { return _volumeIntersectionMask; }
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/** Set the length of the intersection segment.
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* The segments extends this many database units from the camera eye-point along the look vector.
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* If this is left at zero then the diameter of the bounding sphere of the visibility volume is used.*/
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void setSegmentLength(float length) { _segmentLength = length; }
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/** Get the length of the intersection segment.*/
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float getSegmentLength() const { return _segmentLength; }
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protected :
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virtual ~VisibilityGroup() {}
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osg::ref_ptr<osg::Node> _visibilityVolume;
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osg::Node::NodeMask _volumeIntersectionMask;
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float _segmentLength;
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};
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}
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#endif
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