Blending FastSSS2 with VrayMtl

[MANUEL_MOUSIOL]

It seems like its not fully possible to mix and blend the VrayFastSSS2 with the normal VrayMtl. I have a transparent VrayMtl with glossy refractions but they dont appear glossy at all when I blend them with the SSS Mat - only when I turn on the VrayMtl on 100%s is the glossy refraction visible.

BTW, one reason I want to blend the materials is the inability to produce glossy refractions with the FastSSS2 shader.

[vlado]

Hm, this particular case will probably not work too well as both materials are attempting to do stuff inside the object. It would be better handled when we add glossy refraction to the sss2 shader itself.

Best regards,
Vlado

[MANUEL_MOUSIOL]

Hm, this particular case will probably not work too well as both materials are attempting to do stuff inside the object. It would be better handled when we add glossy refraction to the sss2 shader itself.

Best regards,
Vlado

+1 for that feature. I am doing that right now with noise bump...
but I thought it would look very interesting to be able to blend SSS with a normal translucent material, artistic wise

[joconnell]

Hm, this particular case will probably not work too well as both materials are attempting to do stuff inside the object. It would be better handled when we add glossy refraction to the sss2 shader itself.

Best regards,
Vlado

That'd be very useful - using translucency in the main material was the only way to do it before but it's a tad nasty on render times.

[grantwarwick]

Glossy refractions inside the SSS2 shader is 100% critical

[vlado]

Well you have the VRayScatterVolumeMtl material now so you can do that if the coat material is glossy refractive.

Best regards,
Vlado

[grantwarwick]

Well you have the VRayScatterVolumeMtl material now so you can do that if the coat material is glossy refractive.

Best regards,
Vlado

Is it physical to use additive mode with the Scatter Volume?
Cheers,
I've actually been trying this, must have been doing something wrong cause I haven't been able to achieve the effect

[vlado]

Is it physical to use additive mode with the Scatter Volume?

I don't think it matters in this case.

I've actually been trying this, must have been doing something wrong cause I haven't been able to achieve the effect

What kind of effect do you want to achieve?

In any case, it looks like things are moving away from "fast" sss models like dipole approximation and so on (the one used for the VRayFastSSS2 material); even Disney in their latest physically based model simply used path tracing (which is what the VRayScatterVolumeMtl material does) and found out it was not much slower.

Best regards,
Vlado

[grantwarwick]

I don't think it matters in this case.

What kind of effect do you want to achieve?

In any case, it looks like things are moving away from "fast" sss models like dipole approximation and so on (the one used for the VRayFastSSS2 material); even Disney in their latest physically based model simply used path tracing (which is what the VRayScatterVolumeMtl material does) and found out it was not much slower.

Best regards,
Vlado

So turns out I didn't realise blending a 100% refractive material over the top still retained the color of the scatter volume, awesome! Also, in my initial test, I didn't have effect shadow turned out,
Now I'm getting the effect I desired! Awesome!
(Before I was seeing things as if there was an IOR of 1.0 on the refractions)

[Mnietek2707]

Are there any plans to add fog bias parameter to VrayScatterVolume material? I found this parameter in standard VrayMtl very useful...

[vlado]

Are there any plans to add fog bias parameter to VrayScatterVolume material? I found this parameter in standard VrayMtl very useful...

I'm not sure yet. It's a cheat of sorts and the scatter volume material relies on things being physically accurate a lot.

Best regards,
Vlado

[Mnietek2707]

I am playing with this and I miss this parameter. I've used this all the time with VrayMtl translucency. I think this is the only way to achieve look of dense volume - almost opaque...
Why this is not physical? I thought that this parameter describes how quickly density of fog increases with distance..
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sorry for my English