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Implemented NodeVisitor's getLocalToWorldMatrix and getWorldToLocalMatrix

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to allow users to querry the current accumulated matrix state within the
scene graph.
This commit is contained in:
Robert Osfield
2002-02-10 22:35:22 +00:00
parent e6638d9974
commit 7d03f8a548
4 changed files with 152 additions and 10 deletions
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78
src/osg/NodeVisitor.cpp
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@@ -1,4 +1,5 @@
#include <osg/NodeVisitor>
#include <osg/Transform>
#include <stdlib.h>
using namespace osg;
@@ -44,12 +45,81 @@ void NodeVisitor::setTraversalVisitor(NodeVisitor* nv)
else _traversalMode = TRAVERSE_NONE;
}
const bool NodeVisitor::getLocalToWorldMatrix(Matrix& /*matrix*/, MatrixMode /*mode*/)
class TransformVisitor : public NodeVisitor
{
return false;
public:
enum CoordMode
{
WORLD_TO_LOCAL,
LOCAL_TO_WORLD
};
MatrixMode _matrixMode;
CoordMode _coordMode;
Matrix& _matrix;
NodeVisitor* _nodeVisitor;
TransformVisitor(Matrix& matrix,MatrixMode matrixMode,CoordMode coordMode,NodeVisitor* nv):
NodeVisitor(),
_matrixMode(matrixMode),
_coordMode(coordMode),
_matrix(matrix),
_nodeVisitor(nv)
{}
virtual void apply(Transform& transform)
{
bool applyTransform =
(_matrixMode==transform.getMatrixMode()) ||
(_matrixMode==MODELVIEW && (transform.getMatrixMode()==MODEL || transform.getMatrixMode()==VIEW));
if (applyTransform)
{
if (_coordMode==LOCAL_TO_WORLD)
{
osg::Matrix localToWorldMat;
transform.getLocalToWorldMatrix(localToWorldMat,_nodeVisitor);
_matrix.preMult(localToWorldMat);
}
else // worldToLocal
{
osg::Matrix worldToLocalMat;
transform.getWorldToLocalMatrix(worldToLocalMat,_nodeVisitor);
_matrix.postMult(worldToLocalMat);
}
}
}
};
const bool NodeVisitor::getLocalToWorldMatrix(Matrix& matrix, MatrixMode mode, Node* node)
{
matrix.makeIdentity();
TransformVisitor tv(matrix,mode,TransformVisitor::LOCAL_TO_WORLD,this);
for(NodePath::iterator itr=_nodePath.begin();
itr!=_nodePath.end();
++itr)
{
if (*itr==node) return true; // don't account for matrix attached to specofied node
(*itr)->accept(tv);
}
return true;
}
const bool NodeVisitor::getWorldToLocalMatrix(Matrix& /*matrix*/, MatrixMode /*mode*/)
const bool NodeVisitor::getWorldToLocalMatrix(Matrix& matrix, MatrixMode mode, Node* node)
{
return false;
matrix.makeIdentity();
TransformVisitor tv(matrix,mode,TransformVisitor::WORLD_TO_LOCAL,this);
for(NodePath::iterator itr=_nodePath.begin();
itr!=_nodePath.end();
++itr)
{
if (*itr==node) return true; // don't account for matrix attached to specofied node
(*itr)->accept(tv);
}
return true;
}