86 lines
2.8 KiB
C++
86 lines
2.8 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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#include <osgSim/VisibilityGroup>
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#include <osgUtil/CullVisitor>
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#include <osgUtil/IntersectVisitor>
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using namespace osgSim;
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using namespace osg;
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VisibilityGroup::VisibilityGroup():
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_volumeIntersectionMask(0xFFFFFFFF),
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_segmentLength(0.f)
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{
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}
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VisibilityGroup::VisibilityGroup(const VisibilityGroup& sw,const osg::CopyOp& copyop):
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osg::Group(sw,copyop),
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_volumeIntersectionMask(0xFFFFFFFF),
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_segmentLength(0.f)
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{
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}
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void VisibilityGroup::traverse(osg::NodeVisitor& nv)
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{
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if (nv.getTraversalMode()==osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN && nv.getVisitorType() == osg::NodeVisitor::CULL_VISITOR)
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{
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// cast to cullvisitor
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osgUtil::CullVisitor& cv = (osgUtil::CullVisitor&) nv;
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// here we test if we are inside the visibilityvolume
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// first get the eyepoint and in local coordinates
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osg::Vec3 eye = cv.getEyeLocal();
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osg::Vec3 look = cv.getLookVectorLocal();
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// now scale the segment to the segment length - if 0 use the group bounding sphere radius
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float length = _segmentLength;
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if(length == 0.f)
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length = 2.0f*getBound().radius();
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look *= length;
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osg::Vec3 center = eye + look;
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osg::Vec3 seg = center - eye;
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// perform the intersection using the given mask
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osgUtil::IntersectVisitor iv;
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osg::ref_ptr<osg::LineSegment> lineseg = new osg::LineSegment;
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lineseg->set(eye, center);
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iv.addLineSegment(lineseg.get());
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iv.setTraversalMask(_volumeIntersectionMask);
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if(_visibilityVolume.valid())
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_visibilityVolume->accept(iv);
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// now examine the hit record
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if(iv.hits())
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{
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osgUtil::IntersectVisitor::HitList& hitList = iv.getHitList(lineseg.get());
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if(!hitList.empty()) // we actually hit something
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{
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// OSG_INFO << "Hit obstruction"<< std::endl;
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osg::Vec3 normal = hitList.front().getWorldIntersectNormal();
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if((normal*seg) > 0.f ) // we are inside
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Group::traverse(nv);
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}
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}
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}
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else
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{
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Group::traverse(nv);
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}
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}
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