Hi,
On Sat, 2009-07-04 at 18:03 -0500, Carsten Neumann wrote:
> Hi Gerrit,
>
> I've stumbled over the RenderProperties, but there seems to be so much
> machinery involved (NamedSplitFinitPool ?, compile time selection of
> types based on number of bits needed ?) that I can't make sense of them.
Ignore the split part, it is not finished yet. I currently only works
in its basic form with the full mask exactly matched. Later on the two
parts should match differently in a combined fashion, the first part
doing an exact match followed by the second with a prioritized best
match.
> Together with VariantMaterial I think they could solve a problem I have:
> To render nice shadows cast by leaves on a tree model the leaves need to
> have a material that does alpha testing even when rendering the shadow
> map. Normally when rendering shadows I globally override the material,
> but that does not work here, since I don't want to do alpha testing for
> everything (some objects don't even have textures). It seems that
> VariantMaterial could do the right thing for me here, but how do I set
> it up so that it picks the "shadow" material when rendering the shadow
> map and the normal material otherwise (and what do I have to do on the
> render action/partition side) ?
did you look at the Examples/CSM/SimpleVariant* samples. Examples/CSM is
where I usually put my examples/tests. It's not as code but shows the
general setup and controls.
Basically for now you get the mask you need to add the variant from
RenderPropertiesPool, e.g.
varKey = RenderPropertiesPool::the()->getFrom1("shadow")
than you add the variant
varMat->addMaterial(mat, varKey);
Your normal material should be added as the fallback material (for now,
with the RenderPropertiesPool::the()->getDefault() key)
During rendering you set renAct->setRenderProperties(varKey) to
select the variant you want as you do your shadow pass and than
reset it with renAct->resetRenderProperties().
That interface might change in future though, most likely I'll fix
the props per partition, but I'm not 100% if this doesn't have
drawbacks. But it won't change by much.
BTW it also works with ChunkOverrides.
> Or are the RenderProps meant for a different use;
No that is one of the use cases.
> not finished; broken; going away soon ? ;) ;)
not finished and being worked on, but the basic selection should work.
I currently have some graduate work out to look at the general material
model. So I have to finish/clean this soon as it will be the basic
infrastructure to go from.
kind regards,
gerrit
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