Hi Dirk,
Sorry to do a followup on such an old mail, but I've managed to run into
new problems - as usual. :-)))
On Wed, 29 Oct 2003, Dirk Reiners wrote:
> So here's what you can do: call renderact->setZWriteTrans(true); on your
> RenderAction to make the transparent polygons change the Z-Buffer or
> change the BlendChunk to use an alpha key (setAlphaFunc(GL_NOTEQUAL);
> setAlphaValue(0);).
I did that and it works great on the cluent, but doesn't work on the
servers for some reason... :-\
I add a blendchunk to all materials to handle the alpha-keys, and a
polygonchunk to be able to switch to wireframe if necessary.
Here's the relevant code:
----------------------------------------------------------------------
// Traverse the loaded scene and add alpha-keys to all materials
// Plus add the support for wireframe (polygonchunk)
Action::ResultE addChunks(NodePtr& node)
{
if(node->getCore()->getType().isDerivedFrom( ChunkMaterial::getClassType()))
{
ChunkMaterialPtr m = ChunkMaterialPtr::dcast(node->getCore());
if ( checkIfChunksPresent( m ) == false )
{
beginEditCP( m, ChunkMaterial::ChunksFieldId );
m->addChunk( gcl_blendchunk );
m->addChunk( gcl_polychunk );
endEditCP ( m, ChunkMaterial::ChunksFieldId );
}
SLOG << "derived from material, adding chunks" << endLog;
//return Action::Skip;
}
if(node->getCore()->getType().isDerivedFrom( MaterialGroup::getClassType()))
{
MaterialPtr m = MaterialGroupPtr::dcast(node->getCore())->getMaterial();
ChunkMaterialPtr cm = ChunkMaterialPtr::dcast( m );
if ( checkIfChunksPresent( cm ) == false )
{
beginEditCP( cm /*, ChunkMaterial::ChunksFieldId */);
cm->addChunk( gcl_blendchunk );
cm->addChunk( gcl_polychunk );
endEditCP ( cm /*, ChunkMaterial::ChunksFieldId */);
SLOG << "derived from groupmaterial, adding chunks" << endLog;
}
//return Action::Skip;
}
return Action::Continue;
}
---------------------------------------------------------------------------
The funny thing is that the polygonchunk works on the servers aswell (i.e.
I can switch to and from wireframe) so the material changes _are_
propagated but the blending doesn't work at all. ;(
BTW Gerrit's VRML loader creates MaterialGroups, that's why I was playing
with the beginEditCP/endEditpCP calls above but there was no difference
whatsoever.
Any ideas? :)
Thanks,
Akos
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