Extracting Reflections??

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  09 September 2004
Question Extracting Reflections??

I have a bit of a problem...

Basically I have a film footage background with mirrors in , the real camera pans across the room and mirrors are on the far wall. A CG character walks along with the camera pan, he obviously needs to be seen in the mirrors.

So far I've made a poly plane with a reflective material to get a reflecton and put it over where the mirror goes in the footage.

Is there anyway to get an alpha around any mesh being reflected on the plane? so that I could just have it as another layer in post?

Thanks for any advice
  09 September 2004
Add a white surface shader to everything in the scene, except the mirror. Put a black surface shader on the character. Leave reflections enabled on the mirror, so it will reflect everything as white, except the character will be black.....reflection alpha...
God save the queen!!!!
  09 September 2004

THANKS DiGiman !!

I thought it would be somthing like that, I've been working on these shots so long I cant think properly

What i did in the end was to turn the character white and turn off his primary visability. Then I made sure the environment was black and rendered the frame with no alpha channels. That gave me a black image with just a white sillouette of what the mirror could see.

Then I rendered the same frame with the characters normal material, still no primary visability and again no alpha channel. That gave me a black frame with the characters reflection only.

I can use a stencil layer in combustion to add the two together and stick them over the film footage.
  01 January 2006
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