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Material Alpha not working?

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Currently I am trying to create a semi-transparent object using only a D3DMATERIAL. I've given the material an alpha value (for all components although diffuse color should suffice). Following the code in the SDK I am unable to get the object to be anything but opaque (although the color is correct). I would expect it to blend with the background color. Below is the SDK code. Are there any other render states that need to be enabled/disabled for this to work? from the SDK (Material Alpha):
// use material diffuse color component


// Initialize the material with an alpha value, and set the material before drawing.
mtrl.Diffuse = mtrl.Ambient = mtrl.Specular = mtrl.Emissive = 


Thanks, Chris Z.

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