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SSS_fast_skin + PSD using mix8layers/js_multilayers??

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SSS_fast_skin + PSD using mix8layers/js_multilayers?? 
By crystal_hottae on Jan 25, 2006 11:42 AM
I'm reading that you can use mix8layers to make layers, masks, etc.
on top of a SSS_fast_skin shader which will inherit the effects
of the SSS_fast_skin shader.

My goal is to create realistic skin, but add details to the skin in
photoshop that can mix with the effects of the SSS_skin_shader.

So, here's what I start out with:

(Note that I'm unable to select a UV set when creating a PSD node. Sometimes
when I am able to select a UV set, the attributes are gone.)

So when I create a PSD layered node/file, the uv set is unlisted.

I saw a forum post that talked about layering UV sets:
http://www.threedy.com/site/forum/showthread.php?p=314364

It looks like the guy who started this thread is having the same
questions about layering that I am. The thread mentions
using UV sets. So I tried using the relationship editor
to connect shaders with different UV sets.


Quote I read from another forum:
The way the UV sets work is like lets say you have a brick wall like you said.. or a skin texture.. since this is going to tile and repeat.. you wouldn't need to go far and have a grand UV map for it.... just a unified projection would be enough.
But Lets ay you want to put a poster/Grafitti on your wall... and this time you have to have the whole wall projected onto a planar mapping. You simply create a new UVset and and give it a distinctive name.
In the UV connection editor, you could later on assighn the poster texture onto the second set.. and the brick texture onto the UV original Set.
(I usually use this for displacement maps.. since unified and spread out UV coords give me a better result I prepare that one seperately)



Does this mean you can overlap UV sets like layers?

Anyway, when I tried openning the relationship editor,
I wasn't able to figure out how to connect the UV's
to the shaders. I went to Relationship editor > UV linking >
texture-centric. I'm able to see the shaders and UV
sets, but no matter what I try, I can't seem to connect them.
Isn't it as simple as highlighting the UV set from one
column and highlighting the shader in the shader column?


So are there two methods?

1. Overlapping UV sets (i.e. applying the SSS to one UV set,
and applying the PSD layer node to a copy of the first UV set).

2. Using mix8layers (i.e. placing PSD node on layer one, and placing
SSS on layer two).


The person on the other thread that I mention says he has figured it out:


Quote I read from another forum:
The standard Layered Shader in Maya doesn't support Mental Ray rendering that good, so I found the mix8layer Shader on www.Highend3D.com which works pretty much like layers in Photoshop (you can select a whole load of mixing techniques).
I connected my SSS_fast_skin Shader to color.layer0 (base color) and my blinn to color.layer1. Important though is to connect the lmap (lightmap) file for the SSS material to the Shading Group of mix8layer (instead of the old SSS SG). And finally, connect a file node (the alpha map) to o.factor in layer1 (also, I went with normal.mix in blending mode).



Can someone tell me what is meant by "connected SSS_fast_skin to color.layer() and
my blinn to color.layer1" ?

And "And finally, connect a file node (the alpha map) to o.factor in layer1 (also, I went with normal.mix in blending mode" ?

Even when I open up the UV relationship editor, I don't see anything listed as
"color.layer()" or "color.layer1".


If using UV sets as layers is not the answer, and using mix8layers or js_multilayers to mix layers is the better solution, is there anyone gracious enough to write a visual tutorial to help us clearly understand the steps?

If using UV sets as layers is not the answer, and using mix8layers or js_multilayers to mix layers is the better solution, is there anyone gracious enough to write a visual tutorial to help us clearly understand the steps?

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