Vlado... follow-up to your sss skin

[JeffG2]

Vlado,

Thanks so much for the skin shader you posted a few days ago!!! It has helped me considerably.

I have a few brief questions that I will illustrate with a render. The image is forced perspective so all the figures can be seen together.



When I opened your file, the head is about 62 feet tall! (The default file scale is set to U.S. inches)

1. I brought in a figure at about normal size (Figure #1 - 80") and the shader behaves poorly - coloration and contrast are off and interior geometry hurts the sss effect.

2. I brought in a second figure and scales it up (Figure #2 - 240") and the shader behaves slightly better - but the interior geometry still hurts the sss effect.

3. The third figure (Figure #3 - 3542") looks pretty good! This figure is the same scale as the head included in your file.


The SSS seems to be fairly scale sensitive. Is there a reason you are working at such a large scale?

If not, how can the shader be made to work right at a normal scale?



Sorry for the long winded post and thank for any help!




(Below) Final image - skin is starting to look pretty good - but the figure is 259.25 feet tall!

[vlado]

You need to adjust the fog multiplier to your particular scene scale.

For the model I was using, the scale of the scene was way off, which is why I used the box at the side as a helper.

Best regards,
Vlado

[JeffG2]

adjust the fog multiplier to your particular scene scale

Thanks!!!

Fog Multiplier ... that's what I needed.

[JeffG2]

For any interested parties out there --- I changes the fog multiplier from the original 2.0 to 88.

This solved the problem.

It makes sense in that Vlado's original file was appx. 44x times larger than normal scale.