VrayAlSurfaceMTL

[rajdarge]

I find this approach to much easier to use than the VraySkinMtl.
The results come at a cost: the material is much much "grainier" than the Vray skin mtl.
I tried to adjust the "options"
reflect max depth, reflect subdivs, SSS subdivs.
I used various values from default to 100 for all.
It seemed to make little difference, both for render time, and image quality.
however If I change the shading rate to 30 or so, I get nice quality. But then all materials use this image sampling is increased for all things.
I haven't tried to use the denoiser (mainly cause I have yet to understand how to use it).

I would like to increase the quality of skin with the Alsurface material without having the shading rate apply to the whole scene?

[vlado]

Can you show some results? It shouldn't be so much noisier.

Best regards,
Vlado

[thanulee]

I used it in about 20 chars in our latest project with no issues whatsoever. Even with blendmtl that i doubled it to boost it and it wasnt that slow and with 0 artifacts. I sample scenes with local samples though. So lets say i ve sent test scenes with 1-6 samples and noise 0.025 and were almost production ready even in interiors. I will post this work in a month here u ll see results. To be honest the universal sampling methods, are not my liking, i prefer more tweaking manually

[vlado]

To be honest the universal sampling methods, are not my liking, i prefer more tweaking manually

Hehe then you are a rare bird I'm curious to see those results when you post them.

Best regards,
Vlado

[rajdarge]

Sorry I took so long to post anything, but I didn't have a computer where I was.
The first image is an geometry using a standard material with a diffuse texture map only 6.6s to render . The 2nd image is a VraySkinMtl with the diffuse channel only. I wouldn't normally leave it there, but I wanted to keep the setup as default as possible. 1:05 to render. The third image is a default VRayALSurfaceMaterial with the same diffuse texture, but I have applied the sss_mode to 1 (directional.)1:16 to render. The Final Image is VRayALSurfaceMaterial with shading rate set to 30. I used the Vray quick settings on all with studio mode, IM + LC all settings default xpt where I changed the shading rate. THe last render took 16m37s

I used to like to tweak the setting myself, but I've done photography for 5 years and forgotten all the nuances. It was quicker just taking shortcuts as my stumbling efforts with trying to remember the settings from 5 years ago resulted in worse outcomes.
But as you can see with the render times the hit with rendering times was extreme, and the grainyness with the default VrayALsurface material at default is unacceptable. The results though of the vray skin mtl are disspointing. Perhaps I am not appling the texture to the right channel. But I'm so rusty that I creak when I walk.

[vlado]

Well, I guess that's just the way it is...

Best regards,
Vlado

[rajdarge]

Ok, i was kind of hoping for something to increase the sampling just with this material ie in the sampling options

[vlado]

You can always go into the V-Ray object properties for that object and increase the sampling multiplier.

Best regards,
Vlado

[rajdarge]

Ok, that works