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dangerweenie
06-26-2009, 09:06 PM
Hi

I can't get my shadow pass (alpha) to show up through refractive materials ... I really need to use it for compositing.

I've tried:

UseBackgroundShader refracted through a Phong
UseBackgroundShader refracted through mia_material
mip_matte_shadow refracted through mia_material

I've set all the trace depths for shadows and refractions up high, enabled "pass custom alpha" in r/globals, and checked "propagate alpha" in the mia_material (glass geometry between camera and shadowed object). All i seem to get is either solid white alpha (of the entire geometry), or nothing at all.

I checked master_zap's blog, djx's blog, and the mental images production shader manual, and everything works really well ... it's just getting these passes to distort through refractive geometry that I can't figure out ...
Sagroth
06-27-2009, 08:16 PM
Here's a link to related topic, but not exactly about your issue :)

http://www.sigillarium.com/blog/lang/en/175/

If you use mib_transparency -> mip_matteshadow technique mentioned there, you'll get your shadow in alpha through mia_material.
dangerweenie
06-28-2009, 08:37 AM
Here's a link to related topic, but not exactly about your issue :)

http://www.sigillarium.com/blog/lang/en/175/

If you use mib_transparency -> mip_matteshadow technique mentioned there, you'll get your shadow in alpha through mia_material.

I will check it out now, thanks much for replying!