Vray 3 - current SSS issues under one thread.

[linkydot]

Hello! Is there anything new? I've experienced the same problems.

[tashko.zashev]

Hello! Is there anything new? I've experienced the same problems.

Unfortunately not yet.
We will make an announcement here as soon as we have a fix for this problem.

[linkydot]

OK, thank you!

[frantafxstc]

Hi,

here is an issue, latest demo in 3dsmax 2014, SSS2, basic setup, one light, prepass mode (raytraced mode useless for character creation, it produces even more errors already described on this forum).

I have one material applied on two objects, looks fine except for the strong bluish/green tint which is typical for SSS2 but lacking on the real skin of course:


Here I have the material copied in next slot of the material editor and applied to sphere, hence there are
now two identical materials applied on two objects, you can notice total error where the cylinder penetrates sphere. Where is a shadow should be SSS, and where is strong SSS should be a shadow:


Here again one material applied on both objects, this time cylinder does not penetrate sphere, is only very close:


Here again two identical materials applied on two objects, again the error.


So the main issue (except for the blueish/green tint) is that is impossible to get two SSS materials close together. That´s quite bad for character creation, eyes are either glowing or covered in shadows and eyelids too. Using of HDR as source of light better covers this issue as use of "flashlight" front lightning, but is still there. The only workaround is to use one single material for all objects - very problematic solution. The issue is always there - raytraced mode, VraySkin, multi/sub-object material, IDs, ...)

Any solution would be appreciated.

F.

[tashko.zashev]

Hi,

You can control this SSS2 behavior by the "Prepass ID" option.
By default "Prepass ID" is 0 and the material will compute its own local illumination map, if you set both SSS2 materials with "1" then you will get the requested render result.
Please let me know if this helps in your scene.

[Nkal]

Hi,

You can control this SSS2 behavior by the "Prepass ID" option.
By default "Prepass ID" is 0 and the material will compute its own local illumination map, if you set both SSS2 materials with "1" then you will get the requested render result.
Please let me know if this helps in your scene.

Hello,

This may be true for prepass based illumination, however Raytrace mode gets Prepass id greyed out.

There is also the other issue with the strange translucency behavior as I have shown on the original post (sorry at the time different username), this scenario for instance will cause the character's sclera sss to show the outlines of the inner iris, forcing us to use a different type of shader for the eyeballs, not sure if this issue was addressed lately.

Thanks,

[frantafxstc]

Hi,

You can control this SSS2 behavior by the "Prepass ID" option.
By default "Prepass ID" is 0 and the material will compute its own local illumination map, if you set both SSS2 materials with "1" then you will get the requested render result.
Please let me know if this helps in your scene.

Hi,

I would swear I tested this, but I obviously forgot or what. Thanks, it works.

Raytraced mode still has the issue.

[tashko.zashev]

Hi,

I would swear I tested this, but I obviously forgot or what. Thanks, it works.

Raytraced mode still has the issue.

Thank you for the update.

Yes, we still have to fix some issues with the Raytrace mode.

[Bigguns]

Any news about fixing that issue ? ( and the issue that changing the color in the slots of the skin mtl change the overall coloration of the head lets say .. )

[tashko.zashev]

Any news about fixing that issue ? ( and the issue that changing the color in the slots of the skin mtl change the overall coloration of the head lets say .. )

In the latest service pack 3.20 we have added a new parameter called "Raytraced SSS ID" in the V-Ray object properties dialog.

It should help to remove some unwanted artifacts when render intersecting geometry with SSS martial applied.

About the second issue, could you please provide more details because I'm not able to find similar reports in our system.

[flat]

Those feature was not in time for 3.20.03.
Maybe, it seems to provide in 3.30.

In the latest service pack 3.20 we have added a new parameter called "Raytraced SSS ID" in the V-Ray object properties dialog.

[tashko.zashev]

Those feature was not in time for 3.20.03.
Maybe, it seems to provide in 3.30.

Ahh yes, thank you for correcting me.
It is only in the nightly builds so far.