Hi,
I'm trying to control the number of "passes" that I need for my particular
objective.
please consider the code for the traversal of the only technique:
void DefaultTechnique::traverse(osg::NodeVisitor& nv, osgFX::Effect* fx) {
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(&nv);
if(!cv) {
osgFX::Technique::traverse(nv, fx);
return;
}
//TODO: where? once here or once for every loop step?
//cv->pushStateSet(getPassStateSet(0));
osg::Node* override = getOverrideChild(0);
const uint num_passes(computeNeededPasses());
for(uint i(0); i != num_passes; ++i) {
cv->pushStateSet(getPassStateSet(0));
//This tech uses a shader. (just as an example we do some assignments
here)
uniform_a->set(i + 2.0f);
uniform_b->set(i * 2.0f);
if(override) override->accept(*cv);
else fx->inherited_traverse(*cv);
cv->popStateSet();
}
//cv->popStateSet();
}
Not only I don't really know where to place the push and pop of the sate, but I
also don't know if this is overall correct.
Should I place the state's push and pop inside or outside of the loop?
If neither, then where?
Both inside and outside I get:
Warning: detected OpenGL error 'invalid operation' after RenderBin::draw(,)
I can't use the callbacks, since I need to update the uniforms once per pass,
and I don't know how many passes I will have to do since it's a user parameter
changed interactively.
I would appreciate you help please.
It would avoid me digging code for hours to try to understand how to use the
osgFX passes.
Thank you
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=8882#8882
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