render uv pass of an objects reflection

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Old 09 September 2012   #1
render uv pass of an objects reflection

Hello,

I know how to render a uvw pass from the multi pass window, but what if said object is reflecting in a ground. Is there a way to get its reflections uv map in a multipass render?

Thanks!
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Old 09 September 2012   #2
A while ago I did a test in which I applied gradients, in UV colours, as a shader to an object. Make other objects in the scene 100% reflective and you get a reflected UV map. As I remember you need to save as exr for it to have the precision it needs.
Its hacky but it works.
 
Old 09 September 2012   #3
That sounds promising. Do you recall what hues you used exactly and in what order?
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Old 09 September 2012   #4
I may have the file at work, I'll have a look tomorrow.

If you render the uv pass of a plane you should be able to see what colour values need to go where. Then it's a case of layering up grads in a layer shader, each set to add.
 
Old 09 September 2012   #5
Place this image in the luminance channel of a shader, image sampling set to none. Make sure whatever is reflecting it is 100% reflective with no fresnel. Save the render as 32bit.

https://dl.dropbox.com/u/9875461/ST...are_Map.tif.zip

Good luck!
 
Old 10 October 2012   #6
Thank you very much !
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Old 10 October 2012   #7
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