Texture showing up black in render & not letting me use transmission

5rettski

As my title says, I am trying to render something for my class and the glass textures are appearing black, when in painter I gave them a blue texture. And it also doesn't let me use transmission.

iam717

Maybe shadowing? no light source, perhaps try painting a glow & cheat it on the inside as if it did have a light and see what happens, testing stuff can help figure it out, i do not know anything bout the updated applications, but when i tried this stuff it just worked.  I also did not make my own texture/material i edited the one that worked when i played with this stuff.  Sites been slow i suppose cause of the "summer" and events around the world, i tried to help, wondering if you fixed it and if you did sharing it helps all of us and others.

5rettski

It had something to do with the metalness for some reason. If you could tell me why, that would be very helpful.

Eric Chadwick

In glTF PBR, metalness cancels out transmission. I suspect Substance may follow the same logic. The idea is that metals are not transparent, so as you increase metallic the transmission is decreased.

In metallic-rough PBR, metal should be mostly full-metal or no-metal... partial-metallic causes non-physical shading behavior so it should be avoided if possible. It can be used for anti-aliasing in a metallic texture between metal and non-metal parts, but you will get some shading artifacts there.

You can certainly break this rule if you want, like I used metallic for this abalone shell even though it's really not metallic, simply to increase the iridescence effect. https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/IridescenceAbalone#material