Strange lighting on glass material in raytraced view

[sach]

Hi,

Would anyone know why the glass material looks like this? It has odd looking steaks of light… It’s a cube with chamfered edges with the default ground plane on.
(Also happens with GP off, and other/no environment light)

It’s in raytraced mode in R7

Thank you.

Rhino 7 SR23 2022-10-9 (Rhino 7, 7.23.22282.13001, Git hash:master @ a931168ca9426920ae6aa97218710b662f17fc39)
License type: Commercial, build 2022-10-09
License details: Cloud Zoo

Windows 11 (10.0.22621 SR0.0) or greater (Physical RAM: 32Gb)

Computer platform: LAPTOP - Unplugged [69% battery remaining] ~236 minutes left

Hybrid graphics configuration.
Primary display: Intel(R) Iris(R) Xe Graphics (Intel) Memory: 1GB, Driver date: 8-4-2022 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA RTX A1000 Laptop GPU (NVidia) Memory: 4GB, Driver date: 8-22-2022 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 517.13
> Integrated accelerated graphics device (shares primary device ports)
- Video pass-through to primary display device

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 8-22-2022
Driver Version: 31.0.15.1713
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 4 GB

[theoutside (Kyle Houchens)]

what’s your environment look like? Glass usually takes it’s reflection and refraction from the environment.

[sach]

Hi Kyle,
I think it was just a simple studio-type one. The reflections seem a bit psychedelic for that.

[nathanletwory (Nathan 'jesterKing' Letwory)]

Probably a combination of shadows-only floor, internal reflection and shape of the object.

When you put such an object in a proper environment (where there are no objects that show only shadows and let everything else through) things generally start to make sense. Even so, cubes (and chamfered cubes at that) probably surprise us easily.

Most of the glass objects we see are rather thin, so we probably don’t have a good mental image of what to expect.

Here with a more ‘typical’ glass pane in the mix as well.

And one more with the pure cube scaled in width and height (and the chamfered cube hidden).