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How to add opacity to a 3D model in XNA

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I’m using 3dsmx8 and kw x-porter to export my model to x format. The model has an opacity map and a diffuse map, but when I load the model in my game I can only see the diffuse map. I’ve heard there are two ways to get opacity maps into XNA, the first one is to use shaders and to second one is to somehow set the Basiceffect.alpha to some pixel value or something. I’m really lost no and would appreciate some help Could some one write a step by step instruction on how to get it working, point me to a tutorial or some source code that uses models with opacity maps.

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