Refraction issue with blend material?

[Vincit]

Hello,

I have a simple ramp acting as a mask for 2 materials, as you can see from the image below that it works fine on the default max blend shader, however same thing applied to vray blend material and i get pure black with no refraction taking place, am i missing a step?

one last note: i can't use max's default blend because i plan to use vray skin sss/fast sss material which doesn't seem compatible with the default max blend shader as well.

[Morbid Angel]

you need to put the ramp into the base material opacity. What you are seeing is the red material under the refracted material, but red material received no light since it probably does not work with affect shadow. So if you put that ramp into opacity of the red material, then it will be refracted material passing through to the object behind.

[Vincit]

Ah Thanks Dmitry, I get it now, i guess its not working somewhat like usual blend materials, everything has to be done on the base and the rest are "Coatings" I also noticed even displacement materials have to be done this way since displacements not working on any of the coated materials, so multiple layered displacements have to be all mixed and additively added on the base mat.

[Dariusz Makowski (Dadal)]

Ah Thanks Dmitry, I get it now, i guess its not working somewhat like usual blend materials, everything has to be done on the base and the rest are "Coatings" I also noticed even displacement materials have to be done this way since displacements not working on any of the coated materials, so multiple layered displacements have to be all mixed and additively added on the base mat.

Really? I'm pretty sure displacement should work on coated materials just fine. Just use vraydisplacementmod with mtl tick on.

[Vincit]

Tried unfortunately it is not working, you can try the file for yourself and see if i'm missing a step.

https://db.tt/TAgziMvk

side note: i guess vray disp mod use shouldn't be relevant in such a case since material displacement should just as well do the same thing only globally.

[Svetlozar Draganov]

Displacement doesn't work for Coated materials - it only works for the Base one and it will be applied globally on the whole geometry not only where Base material is visible.
If you want to place it over the specific part or to blend different texture maps you should use Composite tex along with the same masks used in VrayBlendMtl.

[vlado]

In addition to what was mentioned above, a refractive material should always be the base material inside a blend material, otherwise stuff like fog may not work as expected.

Best regards,
Vlado

[Vincit]

Noted, thanks guys.