daylight system 3ds max help

cabley123

hey guys i have a problem i need to fix rather fast!

i have put in a daylight system and am using mental ray render in max2010.

i have the whole scene lit the way i want it but for some reason my characters skin comes up as black in the render know matter where i position the daylight. but in the scene the model its lit well.

the skin shader im using is the MR SSS fast skin material.


someone please help.. .this is due in a day and i need a bout 15 to 17 hrs to render.

cabley123

i know this area is not really for this kinda stuff but im not getting any reply's from
TT.

i have a problem i need to fix rather fast!

i have put in a daylight system and am using mental ray render in max2010.

i have the whole scene lit the way i want it but for some reason my characters skin comes up as black in the render know matter where i position the daylight. but in the scene the model its lit well.

the skin shader im using is the MR SSS fast skin material.


someone please help.. .this is due in a day and i need a bout 15 to 17 hrs to render.

cabley123

example of what happens

how it was looking b4 i added daylight..

Visceral

You should probably play with the scale of your SSS shader. The shader is very dependant of scene scale. Also i would try with a spotlight first, beacuse its harder to see SSS shaders with all that fancy indirect illumination.

CompanionCube

upload the file, or just a part of it

Ruz

have you enabled the exposure controls and loaded the daylight preset?
also make sure that the daylight system is set to mrsun and mray sky

Sandro

There's a checkbox in fastsss shader rollout saying 'screen (soft) compositing of layers'

You need to either turn it off or on, I don't remember precisely.

Neox

also test around with the settings in the skinshader itself, there is that one option "screen soft whatever" that makes it greyish and dull and i never understood whats it for

:edit:
just searched for it

3.3 Important note on fast SSS and Sun&Sky
To use the mental ray fast SSS shaders together with the high dynamic range indirect sun and skylight, it is very important to turn on the Indirect parameter so the SSS shader can scatter the skylight (which is considered indirect).
It is equally important to turn off the Screen composit parameter (otherwise the output of the SSS shaders are clamped to a low dynamic range and will appear to render black).

Ark

The black shading normally means the shader isn't compatible with the renderer.
Make sure you have mental ray set as your current renderer and not scanline.

MoP

cabley123: I've merged the two threads. In future, just be patient instead of creating duplicate threads in different sub-forums.

r_fletch_r

Turn off Screen composition.

cabley123

sorry MoP will do.

like i said i had to solve this fast so i just created a standards mat with a similar look to it.

thanx for all the aid
i tried clicking that check box that Sandro talked about, had a fiddle with the mat SSS settings and got results.

but i had to render the animation so il give it a shot at re rendering soon.

thanx again