Clear Glass Rendering Issue

[Anonymous]

I rendered a bench for a seating project with school, and for some reason, the clear glass option has some odd texturing on it: 

https://photos.app.goo.gl/nxYPmLdDHRWOHcKi2

Any idea on how to avoid that?

[SaeedHamza]

Could you share the file?

[lucasproko]

Hey @Anonymous,

That is a rather strange texture - sorry about that. Without your file, I can't truly debug this, but my guess is that you have the glass body in direct contact with the wooden body and sometimes that results in the light refracting in weird ways inside the object and can leave an odd pattern on the face. I would recommend leaving a small gap between the two (0.1mm or 0.005" should work) and seeing if that solves your problem. 

Let me know if this works!

[TrippyLighting]

Are you sure you don;t have some duplicate geometry ?

This looks like surfaces are Z-Fighting, meaning two surfaces occupying the same space.

[Donellereed]

I had the same issue with a boundary fill of a volume of liquid inside a Glass vessel. I was able to resolve the issue by shrinking the volume of the liquid so that it did not touch the sides of the vessel. 

This still seems like a bug to me though. 

[TrippyLighting]

That's not a bug!

The proper workflow for rendering glass in Fusion 360 and many other software packages is to have the volumes clearly overlap and then use the Dielectric Priority Control to give one of the materials a higher priority. E.g. for a glass of water the glass would get then higher priority.

Also, Z-fighting is about as old as computer graphics not exactly a new promlem 😉