Hello Johannes,
On 02/05/2013 06:13 AM, Johannes Brunen wrote:
> I'm curious about the VariantMaterial. I could not find documentation or
> simple examples for this material. Only the CgFXMaterial seems to use
> it, but this is a complex beast :-).
I'm purely going by what I understood from looking at the code...
> So some questions about it:
>
> 1. What is the idea behind this material?
I believe the idea is that it acts a bit like a switch, but instead of
the user explicitly setting a switch value, the "RenderProperties" set
on the RenderAction are used to select a material (or the fallback if no
material matching the RenderProperties is found).
> 2. How to use it properly?
basically you just put a couple of materials in with:
VariantMaterial::addMaterial(PrimeMaterial * const materialP,
MaterialMapKey key = 0);
and a fallback with:
VariantMaterial::setFallbackMaterial(PrimeMaterial * const value);
Of course the real question is how to generate meaningful
MaterialMapKeys so that the material selection based on RenderProperties
works. Unfortunately I don't know that part, sorry.
> 3. Is it always used as a base class?
it's not abstract and I think it can be used on its own.
> 4. How can I iterate over the materials contained in a VariantMaterial?
you can use:
const SFMaterialPtrMap *VariantMaterial::getSFMaterialStore(void) const;
The returned SField stores a std::map<MaterialMapKey, PrimeMaterial *>.
Cheers,
Carsten
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