Dear all,
I'm trying to obtain the model matrix, the view matrix, the projection matrix
and the window matrix. I used the following piece of code in my pick event
handler.
protected unsafe bool pick(OsgGA.GUIEventAdapter ea, OsgViewer.Viewer viewer)
{
......
picker = new
OsgUtil.LineSegmentIntersector(OsgUtil.Intersector.CoordinateFrame.PROJECTION,
ea.getXnormalized(), ea.getYnormalized());
OsgUtil.IntersectionVisitor iv = new OsgUtil.IntersectionVisitor(picker);
viewer.getCamera().accept(iv);
Osg.Matrix VPW = new Matrix();
if (iv.getWindowMatrix()!=null)
{
Osg.Matrix mm = new Osg.Matrix(iv.getWindowMatrix().ptr());
VPW.preMult(mm);
}
if (iv.getProjectionMatrix() != null)
{
Osg.Matrix mm = new
Osg.Matrix(iv.getProjectionMatrix().ptr());
VPW.preMult(mm);
}
if (iv.getViewMatrix() != null)
{
Osg.Matrix mm = new Osg.Matrix(iv.getViewMatrix().ptr());
VPW.preMult(mm);
}
if (iv.getModelMatrix() != null)
{
Osg.Matrix mm = new Osg.Matrix(iv.getModelMatrix().ptr());
VPW.preMult(mm);
}
......
}
But the iv object could never return any matrix and all the Boolean expression
in the if statement always equal to false.
I'm wondering what is wrong here. Is there any thing else that I need to do
before I can obtain the matrices?
Any help is appreciated!
Regards,
Ke Li
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