Hi,
At cull traversal, I do the following (this is pseudo-code!) :
Code:
cullTraversal(pCullVisitor)
{
// Get per-view-data
perViewData = getOrCreatePerViewData(pCullVisitor);
// Compute "dynamic" uniforms
perViewData.pDynamicUniform_1->set(value);
perViewData.pDynamicUniform_2->set(value);
perViewData.pDynamicUniform_3->set(value);
// Push per-view data
pCullVisitor->pushStateSet(perViewData.pStateSet);
// Traverse node
traverse(....)
// Pop per-view data
pCullVisitor->popStateSet();
}
The "getOrCreatePerViewData" method returns a "PerViewData" struct :
Code:
struct PerViewData
{
osg::ref_ptr<osg::StateSet> pStateSet;
osg::ref_ptr<osg::Uniform> pDynamicUniform_1;
osg::ref_ptr<osg::Uniform> pDynamicUniform_2;
osg::ref_ptr<osg::Uniform> pDynamicUniform_3;
PerViewData()
{
pStateSet = new osg::StateSet();
pDynamicUniform_1 = osg::Uniform();
pDynamicUniform_2 = osg::Uniform();
pDynamicUniform_3 = osg::Uniform();
pStateSet->addUniform(pDynamicUniform_1);
pStateSet->addUniform(pDynamicUniform_2);
pStateSet->addUniform(pDynamicUniform_3);
}
}
PerViewData getOrCreatePerViewData(pCullVisitor)
{
return m_perViewDataMap[pCullVisitor];
}
Just be carrefull to :
- remove "PerViewData" instance from the "m_perViewDataMap" when the
corresponding "pCullVisitor" instance is destroyed. (use an osg::Observer here)
- add any necessary mutex in multithreading mode
Cheers,
Aurelien
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=56957#56957
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