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Render shadows on transparent background

Hi,

I am creating sprites for a game and I want my object to cast shadows on a transparent background. I am using 3Dmax scanline renderer.

Rendering with just the object gives me a image with a alpha but obviously the shadow does not extend passed the object.

So I have setup a ground plane with a matte material to receive shadows. But I cannot set it so only the shadow gets rendered.

I just want the object on a transparent image that includes the full shadow in alpha. So I can overlay this image (that could be a building) on top of ground images in the game.

Thanks in advance,

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