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Addd new computeLocalToWorld(NodePath) etc methods.

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Robert Osfield 2003-04-14 13:22:21 +00:00
parent a202cfa4f3
commit 3df0401007
2 changed files with 108 additions and 0 deletions
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21
include/osg/Transform
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@ -19,6 +19,27 @@
namespace osg {
/** compute the matrix which transforms objects in local coords to world coords,
* by accumulating the Transform local to world matrices along the specified node path.*/
extern SG_EXPORT Matrix computeLocalToWorld(NodePath& nodePath);
/** compute the matrix which transforms objects in world coords to local coords,
* by accumulating the Transform world to local matrices along the specified node path.*/
extern SG_EXPORT Matrix computeWorldToLocal(NodePath& nodePath);
/** compute the matrix which transforms objects in local coords to world coords,
* by accumulating the Transform local to world matrices along the specified node path
* the supplied initialial camera modelview .*/
extern SG_EXPORT Matrix computeLocalToEye(const Matrix& modelview, NodePath& nodePath);
/** compute the matrix which transforms objects in world coords to local coords,
* by accumulating the Transform world to local matrices along the specified node path
* the inverse of the supplied initialial camera modelview.*/
extern SG_EXPORT Matrix computeEyeToLocal(const Matrix& modelview, NodePath& nodePath);
/** A Transform is a group node for which all children are transformed by
* a 4x4 matrix. It is often used for positioning objects within a scene,
* producing trackball functionality or for animation.

87
src/osg/Transform.cpp
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@ -14,6 +14,93 @@
using namespace osg;
class TransformVisitor : public NodeVisitor
{
public:
enum CoordMode
{
WORLD_TO_LOCAL,
LOCAL_TO_WORLD
};
CoordMode _coordMode;
Matrix& _matrix;
TransformVisitor(Matrix& matrix,CoordMode coordMode):
NodeVisitor(),
_coordMode(coordMode),
_matrix(matrix)
{}
virtual void apply(Transform& transform)
{
if (_coordMode==LOCAL_TO_WORLD)
{
transform.getLocalToWorldMatrix(_matrix,this);
}
else // worldToLocal
{
transform.getWorldToLocalMatrix(_matrix,this);
}
}
void accumulate(NodePath& nodePath)
{
for(NodePath::iterator itr=nodePath.begin();
itr!=nodePath.end();
++itr)
{
(*itr)->accept(*this);
}
}
};
Matrix osg::computeLocalToWorld(NodePath& nodePath)
{
Matrix matrix;
TransformVisitor tv(matrix,TransformVisitor::LOCAL_TO_WORLD);
tv.accumulate(nodePath);
return matrix;
}
Matrix osg::computeWorldToLocal(NodePath& nodePath)
{
osg::Matrix matrix;
TransformVisitor tv(matrix,TransformVisitor::WORLD_TO_LOCAL);
tv.accumulate(nodePath);
return matrix;
}
Matrix osg::computeLocalToEye(const Matrix& modelview,NodePath& nodePath)
{
Matrix matrix(modelview);
TransformVisitor tv(matrix,TransformVisitor::LOCAL_TO_WORLD);
tv.accumulate(nodePath);
return matrix;
}
Matrix osg::computeEyeToLocal(const Matrix& modelview,NodePath& nodePath)
{
Matrix matrix;
matrix.invert(modelview);
TransformVisitor tv(matrix,TransformVisitor::WORLD_TO_LOCAL);
tv.accumulate(nodePath);
return matrix;
}
Transform::Transform()
{
_referenceFrame = RELATIVE_TO_PARENTS;