Break Subsurface Scattering into Render Layers – mental ray
by put3d on เม.ย..15, 2009, under Lighting&Rendering Tutorial, Maya Tutorial, Mental Ray, Tutorial
Greetings everyone. So I’ve had a number of people approach me here at school about a method I’ve been using to break my Miss_fast_skin_maya subsurface shader into render layers so I have near absolute control of it in compositing, so I though I’d write up a tutorial here to share.
Please note: This tutorial is more about the process of breaking the subsurface into render layers and compositing them in post, rather than how to use the miss_fast_skin_maya subsurface shader. There are several rather excellent subsurface tutorials out there on the internet, a couple of them being here on CGTalk, though one in particular I’ve found to be very well written and quite verbose is Jared Martin’s tutorial here. However, please note that even though Jared’s tutorial is based on the miss_fast_simple_maya subsurface shader, you’ll find the fast simple and fast skin shaders are almost identical, except the skin shader brings the Epidermal, Subdermal, and Back scatter attributes in to replace the fast simple’s front and back SSS color attributes. Also, the fast skin shader has more specular control than the latter. But the same methods used in this tutorial will work with the fast simple subsurface shader as well.
Also note, Maya 7.0.1 was used in this tutorial, however, the general methods apply to all 3d applications where render layers and layer overrides are achievable. This tutorial is assuming you already have your subsurface shader set up and working, though, if you have any questions or complications, feel free to ask and I’m sure one of the many bright minds here at CG Talk can point you in the right direction. Or I can help you, either way.
By the end of this tutorial, I will have walked you through, not only how to break down your subsurface shader attributes into their own render layers, but also how to render out an occlusion pass, and a shadow pass for compositing in post. You could take this even further on your own as a fun little experiment to render out your light passes, ZDepth, Motion vectors, etc, but I won’t be delving into that here. (Perhaps for another tutorial topic? � send me a PM if it’s of interest)
Without further delay, time to begin! First things first, test your subsurface shader with a beauty pass, just to make sure all is in order. I wish I could say I had a pretty model for you guys properly UVed with a color/spec/bump map, but good ol’ MaleHead here via the Modo example model includes will have to do. Obviously there are some issues here, but, for the purposes of this tutorial, this will work.
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