Hi Marcus,
On Mon, 2005-04-18 at 14:03 +0200, Marcus Lindblom wrote:
> Hi,
>
> I'm trying to use the Action or NewAction framework to simply traverse a
> graph and add a materialchunk to all nodes with applicable cores.
>
> However, I can't really get my head around to what to write. I can't
> find a really examples at least to what I find.
...
> How to achieve this in as few lines as possible?
The big question is if you want to do this temporarily while rendering,
or permanently as a preprocess. For the temporary case I don't have a
solution, as the state handling is more oriented towards the Materials
right now, and doesn't allow for temporary changes during traversals.
For the permanent case I would use a traverser like the example in the
tutorial 09traverse.cpp. Something like this (warning, untested code):
void doMaterial(MaterialPtr m)
{
if(m == NullFC)
return;
ChunkMaterialPtr cm = ChunkMaterialPtr::dcast(m);
if(cm != NullFC)
{
cm->addChunk(newchunk);
}
}
Action::ResultE changeMaterial(NodePtr& node)
{
if(node->getCore()->getType().isDerivedFrom(Geometry::getClassType()))
{
GeometryPtr g = GeometryPtr::dcast(node->getCore());
doMaterial(g->getMaterial());
}
if(node->getCore()->getType().isDerivedFrom(MaterialGroup::getClassType()))
{
MaterialGroupPtr mg = MaterialGroupPtr::dcast(node->getCore());
doMaterial(mg->getMaterial());
}
return Action::Continue;
}
traverse(scene,
osgTypedFunctionFunctor1CPtrRef<Action::ResultE,
NodePtr >(changeTexture));
It's a couple more lines, mainly because of the safe casts, but it
should work fine.
Hope it helps
Dirk
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