What is the Prepass ID in VRayFastSSS2 Mtl?

[sersia]

Hi,

What is the Prepass ID in VRayFastSSS2 Mtl? And how could I use it?
I couldn't find the information about the Prepass ID.

Thank you for your help in advance.

Best Regards,
Sangho Jung.

[vlado]

It allows several different fastsss2 materials to share the same illumination map to avoid differences in their shading along the seams. Sometimes a character's body would have different materials applied to different parts and the sss effect needs to be seamless between them. In that case, you just need to assign the same prepass ID to all the materials that you want to share the same map. If the prepass ID is zero, the map is local for the material only.

Best regards,
Vlado

[sersia]

It allows several different fastsss2 materials to share the same illumination map to avoid differences in their shading along the seams. Sometimes a character's body would have different materials applied to different parts and the sss effect needs to be seamless between them. In that case, you just need to assign the same prepass ID to all the materials that you want to share the same map. If the prepass ID is zero, the map is local for the material only.

Best regards,
Vlado

Thank you for your help. I got a test as you mentioned, it was great!!
And thank you for the Geometry Based Sampling as well.

Best Regards,
Sangho Jung.