How to render with a transparent background?

[xfon5168]

What is the best way to render a scene with a transparent background/floor but keep all the reflections in R10?

Thanks.

Do you mean to render a scene but lose the background and keep it's reflections? Hmm..

I think if you put a compositing tag on all your objects EXCEPT the Background/floor...make them all have their own object buffer(or if you dont need to tweak them give them all the same object buffeR). Turn on Multipass render in the render settings and choose the object buffer(s) and then also add a Reflection and/or environment pass. Depends on if you're just using reflections or if you're using the environment channel. Then composit them in Photoshop or whatever you wish.

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