98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
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/* -*-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 <osg/ComputeBoundsVisitor>
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#include <osg/Transform>
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#include <osg/Drawable>
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#include <osg/Geode>
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using namespace osg;
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ComputeBoundsVisitor::ComputeBoundsVisitor(TraversalMode traversalMode):
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osg::NodeVisitor(traversalMode)
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{
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}
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void ComputeBoundsVisitor::reset()
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{
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_matrixStack.clear();
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_bb.init();
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}
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void ComputeBoundsVisitor::getPolytope(osg::Polytope& polytope, float margin) const
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{
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float delta = _bb.radius()*margin;
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polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
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polytope.add( osg::Plane(0.0, 0.0, -1.0, (_bb.zMax()+delta)) );
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polytope.add( osg::Plane(1.0, 0.0, 0.0, -(_bb.xMin()-delta)) );
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polytope.add( osg::Plane(-1.0, 0.0, 0.0, (_bb.xMax()+delta)) );
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polytope.add( osg::Plane(0.0, 1.0, 0.0, -(_bb.yMin()-delta)) );
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polytope.add( osg::Plane(0.0, -1.0, 0.0, (_bb.yMax()+delta)) );
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}
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void ComputeBoundsVisitor::getBase(osg::Polytope& polytope, float margin) const
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{
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float delta = _bb.radius()*margin;
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polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
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}
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void ComputeBoundsVisitor::apply(osg::Node& node)
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{
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traverse(node);
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}
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void ComputeBoundsVisitor::apply(osg::Transform& transform)
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{
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osg::Matrix matrix;
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if (!_matrixStack.empty()) matrix = _matrixStack.back();
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transform.computeLocalToWorldMatrix(matrix,this);
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pushMatrix(matrix);
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traverse(transform);
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popMatrix();
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}
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void ComputeBoundsVisitor::apply(osg::Geode& geode)
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{
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for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
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{
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applyDrawable(geode.getDrawable(i));
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}
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}
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void ComputeBoundsVisitor::applyDrawable(osg::Drawable* drawable)
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{
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if (_matrixStack.empty()) _bb.expandBy(drawable->getBound());
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else
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{
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osg::Matrix& matrix = _matrixStack.back();
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const osg::BoundingBox& dbb = drawable->getBound();
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if (dbb.valid())
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{
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_bb.expandBy(dbb.corner(0) * matrix);
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_bb.expandBy(dbb.corner(1) * matrix);
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_bb.expandBy(dbb.corner(2) * matrix);
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_bb.expandBy(dbb.corner(3) * matrix);
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_bb.expandBy(dbb.corner(4) * matrix);
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_bb.expandBy(dbb.corner(5) * matrix);
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_bb.expandBy(dbb.corner(6) * matrix);
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_bb.expandBy(dbb.corner(7) * matrix);
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}
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}
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}
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