SSS Issue...

Hi, Yesterday I was making some test renders of my BlenRig character. The model has 7 different material channels that correspond to different parts of the body. This layout allows the character to have some very detailed textures applied to it.

Well, I rendered an image and I found out that the seams between the different material channels were somehow showing, specially where there were shadows or darker areas of the shading.

I tried a few things and finally I discovered that it was the SSS that was messing things up.
Each of the 7 materials has the same SSS parameters. I even rendered the image again and again with different Scale and Error values. The greater the scale the worse.

It seems to me that for some reason SSS calculates shading in a slightly different way for the boundaries of each material channel, like if each material was a different object, and that´s why the borders of each material are not rendering smoothly and seamlessly.

Obviously I finally rendered the image without SSS and everything came out just fine. But it´s a pitty that you can´t use SSS if you have multiple material channels.

Has this issue been adressed or something??

I´ve just made this simple test with a sphere and the same thing happens.

I´m wondering if there could be a way to assign SSS to the mesh as a whole with nodes…

The sphere has two identical materials assigned to it, nevertheless you can see the difference between their shading

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This is a known issue . . . hopefully it will be resolved relatively soon.

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Oh, thanks Cire!!