[4.25 Preview] Lack of backface culling when using ray tracing breaks RT translucency

[Death_Daisy]

In the image, the window to the left are using glass panes that are convex towards the camera but without any thickness, the window to the right are using thick panes. further to the right are a sphere and a plane with the same material to show the issue more clearly. messing around with the max refraction rays and r.RayTracing.Translucency.MaxRayDistance doesnt seem to make a difference.

when looking at the plane and window with the thin panes from behind, the faces are still visible, so what I assume happens is that the refraction rays get confused and cant penetrate properly which I guess isnt intended. is there any way to fix this atm?

[Death_Daisy]

@presto423

How do you know there’s a lack of backface culling with ray tracing? I thought I remember reading in the docs the path goes from back to front when rendering translucency, whether ray tracing or not. So, setting translucency sort priority probably wouldn’t fix it, unless it’s connected to another part of the rendering. I reference sort priority because it’s odd that the sphere is closer than the thin-pane window at furthest left, and is not translucent. Is any of the sphere’s or thicker-pane window’s settings different from the thin-pane window and plane in translucency?

All the objects share the same material and mesh rendering settings, I spent a lot of time trying to track down the problem Ive attached some more images showing the difference between ray tracing and raster, especially when shown from behind where the backfaces are indeed visible and also show some of the same black weirdness which is why I figured it could be that thats the problem