CGTalk - miss fast skin shader incorrect alpha?

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alecorre

11-16-2005, 01:32 PM

Hi

I am trying to use the mental ray shader miss_fast_skin_maya. When you render it out and look at the alpha channel, it is reversed. Makes it a bit difficult when compositing to say the least. There must be some way around this.

Allen

tharrell

11-16-2005, 02:27 PM

Try this:

- Go to Render Globals (Render Settings in Maya 7)
- Hunt for the "custom entities" group -- it's near the performance & memory section
- Check the "pass custom alpha" checkbox

You also need to do this if you're using DGS/Dielectric/Car paint shaders -- maybe any Mental Ray native phenomena.

Hope this helps,

--T

alecorre

11-16-2005, 02:39 PM

Thanks for the help. You just solved two of my problems with that one replay. Excellent!

Allen

tharrell

11-17-2005, 12:43 AM

Glad to help!

I ran into that problem when I started playing more deeply with Mental Ray a year or so ago. As if getting predictable results out of mi_sss isn't frustrating enough :D

If you're just working with the Maya docs, I'd strongly recommend going over to the LAMRUG site and taking a couple of their walkthroughs for SSS nodes. There's a serious science to getting lightmaps plugged in and working, falloff, scaling... all of it, really.

http://www.lamrug.org/resources/skintips.html

--T

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