[Maya2osg-users] Normal mapping

[Jean-Sébastien G. <jea...@cm...>]

Hello,

I'm wondering what is needed to get normal mapping correctly exported. 
In the log file, I currently always get the "No File Texture attached to 
Surface Shader Bump Map Attribute !" message, which I can see is output 
in mesh.cpp around line 380. The result I get is that the .osg file 
contains a shader for normal mapping but the model does not have a 
tangent vector array, so it looks all black.

In my scene I connected a File texture to the "Bump Mapping" input of a 
blinn material. In HyperShade I can see that blinn1.normalCamera is 
connected to bump2d1.outNormal, and then bump2d1.bumpValue is connected 
to file1.outAlpha.

 From the code, I can see that the plugin is looking at the normalCamera 
input of the surface shader to get the bump2d node, and then the 
bumpValue input of the bump2d node to get the file texture. That all 
seems correct to me.

I've added some debugging code in mesh.cpp around line 368. What I get 
is that mBumpTexture has type kDependencyNode, not kFileTexture. Why? I 
know too little about the Maya SDK at this time to know what to do about 
this. Can a File Texture be extracted from the dependency node? (i.e. 
there would be one level of indirection more than the plugin code expects)

I can send the scene if you want. Hopefully my description above is good 
enough.

The other thing I think should happen is that if this code detects there 
is no normal map (even if it is erroneous right now) then in some other 
place in the plugin code, the shader used should not try to do normal 
mapping. It seems that the test to see if normal mapping is used is not 
the same. I can correct this later.

Thanks in advance,

J-S
-- 
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Jean-Sebastien Guay    jea...@cm...
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