Request: Allow in-game switching of materials about upbge HOT 6 CLOSED

@axredneck : I was thinking of a python callback ran just before update object uniform of the custom shader. But it's only for custom shader not for blender material.
Else material switch will be targeted in 0.1.1.

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@sdfgeoff: I don't know if changing material during runtime can be easy to implement... I think this is like light.type (we can't change it without to have to recompile the shader... But maybe Tristan has a better idea about that.
But what we could do is a function that copy all other material properties and apply it to our material.

• Copy a material properties and assign it to our material can already be done (for the most part) with new KX_BlenderMaterial API:

KX_PYATTRIBUTE_RW_FUNCTION("alpha", KX_BlenderMaterial, pyattr_get_alpha, pyattr_set_alpha),
KX_PYATTRIBUTE_RW_FUNCTION("hardness", KX_BlenderMaterial, pyattr_get_hardness, pyattr_set_hardness),
KX_PYATTRIBUTE_RW_FUNCTION("specularIntensity", KX_BlenderMaterial, pyattr_get_specular_intensity, pyattr_set_specular_intensity),
KX_PYATTRIBUTE_RW_FUNCTION("specularColor", KX_BlenderMaterial, pyattr_get_specular_color, pyattr_set_specular_color),
KX_PYATTRIBUTE_RW_FUNCTION("diffuseIntensity", KX_BlenderMaterial, pyattr_get_diffuse_intensity, pyattr_set_diffuse_intensity),
KX_PYATTRIBUTE_RW_FUNCTION("diffuseColor", KX_BlenderMaterial, pyattr_get_diffuse_color, pyattr_set_diffuse_color),
KX_PYATTRIBUTE_RW_FUNCTION("emit", KX_BlenderMaterial, pyattr_get_emit, pyattr_set_emit),

RW means read and write.

• For shadows in custom shaders, you can have a look here: http://blenderartists.org/forum/showthread.php?390765-Custom-GLSL-Materials-with-Shadows

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@sdfgeoff : So you want to replace material for a RAS_MeshObject not per game object : RAS_MeshSlot ?
If yes i propose the following API:
KX_MeshProxy.replaceMaterial(matid, KX_BlenderMaterial)

But here we will get some trouble because there's no way to find a KX_BlenderMaterial other than found it in a mesh, so if we replace it, it's lost the the material.....
The solution shoudl be to expose a list of all material in a python proxy for the KX_BlenderSceneConverter.

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Well I believe materials are associated with meshes, or at least, a texture slot in a mesh. As such it makes sense for the operation to be on a mesh.

If you replace it it's lost. That's fine by me.

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Is it possible to implement tweaking the same material by passing some per-object "uniforms" to the shader, like "Object Color" already does? I know it's not exactly "switching of materials" but it can serve the same purpose, especially if passing these "uniforms" to node material.
edit: Excuse me for proposing yet another "feature request".

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#244

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