pcm visible in refraction

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Old 10 October 2012   #1
pcm visible in refraction

Hi all,

I have this problem with separating objects out in layer passes. I've set up a simple scene to test various things but I can't seem to make it work. It's probably me and I hope someone can help.

I have one sphere with a refractive material on it. Behind the sphere is a cube with a colored material. What I want is to separate the colored cube from the sphere in a pcm so it's possible to color correct etc. in post. So I created a pcm and assigned the cube to it. Then I created a beauty pass and with the hidden produce refraction and hidden visible in refraction checked. Now when I render I get a a nice pass off the cube where they are not overlapping but I don't get the cubes visibility where the refraction would be. It is probably me but is it possible to get what I'm looking for.

This is just a test scene to figure things out so my final image will not be an ugly cube and a sphere like this

Hope someone can help. Thanks in advance.
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Old 10 October 2012   #2
You will need to run a refraction pass if you are using render passes.
Otherwise if you are using render layers, then include the sphere with the cube in the render but create an override to turn off the sphere's reflectivity and diffuse if any, leaving only the refraction property on.
 
Old 10 October 2012   #3
Thanks for the reply.

I tried running a refraction pass but it still doesn't appear in the refraction. I get a total black image in the refraction pass. Are there some settings that I need to take into account. Like the min and max refractions?

Thanks again.
 
Old 10 October 2012   #4
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