Difference Blend

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tonyg

You can get a copy of mfctex or D3DMulTex for DX or OGLMultex for OGL. These tools allow you to visualise different blend modes and then produce the code you would need (at a DX/OGL level) to create that blend.
You would then need to change the code to match the Bmax driver syntax :

d3d7graphicsdriver().direct3ddevice7().SetTextureStageState(

There is an example of using different blend modes here