Hello.

I noticed something while building a material.
I created a SSS fast Skin material with SSS and placed as part of a blend material.
I’m using Max 2010, displacement is enabled, but the material doesn’t displace.
I copied the material (the Fast skin + SSS), to a new single slot, and applied that to the object, and it worked. If i copy the working material to the blend material it doesn’t displace.
So it seems that Fast SSS + displacement doesn’t work when it’s part of a blend material.

Anyone know why is this happening?

thanks in advance

OK, After a few experiments i notices that the same thing happens if the Fast Skin SSS + Displacement is part of a multi/sub-object material.

SSS Fast does not work in a Blend at all. Don’t do it.
All SSS effects will be lost if it is a child material of a parent material like blend. SSS in an MSO is OK, just one where the materials are mixed or composited, blend, composite, shellac etc…

Samab Hi.

Thanks for the reply.
I did a few experiments, and noticed that when in a blend or multisub matterial, a SSS material works fine (in means of SSS). ONLY the Dissplacement doesn’t seem to work.
I’ve made a lot of models with multiple SSS shaders and everything worked fine, i simply never used Displacement on them.
So ther problem seems to be focused on Dissplacement only.
furthermore i tried moething else.
I selected haplf of the polys of an object (sphere), applied an SSS fast skin + Displacemnt (no multisub material) to them, then selected the rest polygons and applied a different material.
The dissplacement didn’t work here either.
This is a HUGE bug, as a character or creature model is best to use multiple materials.

I just tried the displacement, and can confirm it does not work. This is a problem for using SSS in an MSO material.
I’m going to disregard the fact that it also happens in a blend, because as I said, SSS doesn’t work in a blend anyway. So there are no valid circumstances where you would have that setup. If you are making a blend material, use A&D, Standard or ProMat, where displacement does work. You are wasting you time using SSS in blend.
See the two renders. The very same object, one has just plain SSS, the other an instance of the same SSS in a blend material. Look at the softness of the shadows on it, a tell-tale of SSS.
If you still don’t believe me, read this form Zap himself.

This is because a “material phenomenon” can’t easily be combined with other things… coz it’s a “whole complete package”. And due to the peculiar requirements of the skin shader, it will not work if it is a “child” of some other material (like a Blend material in 3ds Max, or similar). So it’s a wee bit hard to do from the UI.

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Thanks for the reply,you made things a lot clearer.