Hi Micael,
I've been stuck with this issue for a while now and I really have no idea what
is causing it. I have a really basic scene that render just fine using the
basic OpenGL rendering pipeline but when I enable the
osg::Camera::FRAME_BUFFER_OBJECT tag with any osgPPU shader this is the result
I get. http://youtu.be/k0-IGAvNy_s
I have tried to use osgViewer as the base of my application instead of SFML
witch fixed the problem but it can't be a permanent solution for me. It appears
that the function osgUtil::SceneView::draw() is called even when it's not
rendering. Here are the parts of my code that could be causing the problem.
I have no idea what SFML is, and if your app works with osgViewer but
doesn't with some other viewer I don't know how useful my comments will
be. I've had a problem very similar to this with osgPPU myself in the
past, and it was caused by the camera's compute near far mode being set
to auto compute. Basically the problem was that when the cull visitor
traversed the processor, it would try to include it in the near-far
computation, which would then compute wrong values and clip out osgPPU's
final render quad.
In osgPPU's examples, the camera's near-far computation is disabled, but
I couldn't do this in our projects because we rely on this feature. The
solution I found was to override osgPPU::Processor's traverse() method
disabling near-far computation for its children.
class OurProcessor : public osgPPU::Processor
{
public:
OurProcessor() : osgPPU::Processor() {}
virtual void traverse(osg::NodeVisitor& nv)
{
osg::CullSettings::ComputeNearFarMode oldComputeNearFarMode;
osgUtil::CullVisitor* cv =
dynamic_cast<osgUtil::CullVisitor*>(&nv);
if (cv)
{
oldComputeNearFarMode = cv->getComputeNearFarMode();
cv->setComputeNearFarMode(
osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
}
osgPPU::Processor::traverse(nv);
if (cv)
{
cv->setComputeNearFarMode(oldComputeNearFarMode);
}
}
};
However, as I said I know nothing about SFML. If in osgViewer you forced
the viewer camera's near-far computation off but not in SFML, then you
might be seeing this kind of problem, but if not then I don't know what
else could be going on...
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.dyndns-web.com/
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