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