Hi,
A Camera does not inherit the render target implementation, it will simply use
what is specified (default FRAMEBUFFER).
You bring up a valid use case, perhaps adding an "inherit render target" mode
for Cameras would be a nice feature for the osg core to have.
For the time being what I would suggest is that you don't really need a Camera,
you just need a way to set the modelView and projection matrices to identity
before drawing your GUI (i.e. work in screen relative coordinates). You can do
that with a cull callback:
Code:
class ScreenRelativeCallback : public osg::NodeCallback
{
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
cv->pushModelViewMatrix(new osg::RefMatrix(),
osg::Transform::ABSOLUTE_RF);
cv->pushProjectionMatrix(new osg::RefMatrix());
traverse(node, nv);
cv->popModelViewMatrix();
cv->popProjectionMatrix();
}
else
traverse(node, nv);
}
Then instead of decorating your GUI with a Camera, you decorate it with a Group
and add the cull callback: group->addCullCallback(new ScreenRelativeCallback);
In addition you may need to set a RenderBin so that the GUI is drawn after the
scene.
I haven't tested this out but I believe it will work.
Cheers,
Jannik
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=68295#68295
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