So I am trying to re-create a piece of glass that has a graphic interlayer, so glass over the top of the printed image. So I made a piece that has the graphic on it, and a clear piece of glass over the top, two different pieces. I am getting a weird issue in the corner. One is square and the other is a triangle that appear darker.
Any thoughts on what might be causing this?
Render1.png-compressed.pdf (629.7 KB)
Does the glass have a rear face that’s exactly superposed with the image? If yes, add a little bit of space between them. Those artifacts are usually caused by duplicate faces, but they can also happen if faces from 2 separate objects occupy the same space.
thank you so much @etn249
This is the second time having two things in the same space has gotten me into trouble.
Is what I am trying to do correct, with adding a glass material on top of the graphic, I was trying to give it more depth
Yes, this is completely fine and realistic.
However, just be aware that Cycles can have trouble lighting objects through glass, which could cause them to be too dark and noisy. If you have that problem, you can build your glass material like this:
This setup will cause shadows to use the transparent BSDF instead of the regular shader. Then, you can control exactly how dark you want the glass’ shadow by changing the color of the transparent node.
Thank you, and for the image. That helps me. I just used the glass BSDF before, but this provides more flexibility.
Sometimes it can be very beneficial to know how to setup glass manually. Here is one for “thin geometry” that still utilizes refraction to allow for rough refraction which requires the incoming normal for refraction only, that also allows for diffuse light transmission (diffuse/translucency mix). Note that the transparency thing only makes the opaque refraction part fully transparent (rough refraction wouldn’t be, but) doing regular light transport for the rest of the absorption part.
Again, this is “thin geometry”, so think architectural glass rather than glass objects with a thickness to it.
