View Full Version : Extracting Reflections??
09 September 2004, 12:27 PM
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, 04:55 PM
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... :hmm:
09 September 2004, 05:48 PM
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, 07:00 AM
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