R8 Arctic transparency bug?

[anon (am)]

Trying to change transparency of a layer per detail in a derivative of Arctic display mode. Decreasing opacity makes the display blacker, somehow. Seems quite whack.

What is going on here?

SystemInfo-R8

Rhino 8 SR8 2024-5-21 (Rhino 8, 8.8.24142.13001, Git hash:master @ cf2a36827c139ab301c2560ae9153ea7a926bdec)
License type: Commercial, build 2024-05-21
License details: Cloud Zoo

Windows 10 (10.0.17134 SR0.0) or greater (Physical RAM: 16GB)
.NET 7.0.0

Computer platform: LAPTOP - Plugged in [97% battery remaining]

Non-hybrid graphics configuration.
Primary display and OpenGL: NVIDIA Quadro P2000 with Max-Q Design (NVidia) Memory: 4GB, Driver date: 4-11-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 552.22
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA Quadro P2000 with Max-Q Design (NVidia) Memory: 4GB, Driver date: 4-11-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 552.22
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port

Secondary graphics devices.
Intel(R) UHD Graphics P630 (Intel) Memory: 1GB, Driver date: 2-18-2021 (M-D-Y).
> Integrated graphics device with 3 adapter port(s)
- There are no monitors attached to this device. Laptop lid is probably closed

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: 4-11-2024
Driver Version: 31.0.15.5222
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 4 GB

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 8\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.8.24142.13001
C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp “SectionTools”

arctictransparencybug.3dm (66.4 KB)

[anon (am)]

Any ideas? Why does increasing transparency in Arctic make it display darker and less transparent?

[ShynnSup]

Hi, you might have better luck using a material with transparency and rendered mode.

Or change those object display mode to shaded or ghosted or some other custom display mode with command SetObjectDisplayMode.

As described here arctic and transparency are not exactly supported.

Control amount of Transparecy of Material in Arctic Mode?

Okay, let’s go through what’s actually happening here, and why. The main problem here is that Rhino does not support making shadows lighter if they are caused by transparent objects. So ideally, if we have a solid object, the shadow that is cast due to the object should be at “full strength”, a shadow cast due to a 50% transparent object should be at “half strength”, and a shadow cast due to a 100% transparent object should not be visible at all. Rhino only supports casting a full strength sha…

[anon (am)]

Thanks for the post. Wow,

@DavidEranen

this is all very confusing and not really working correctly

is true all right.

@ShynnSup

Or change those object display mode to shaded or ghosted or some other custom display mode with command SetObjectDisplayMode.

Yeah, I’m doing that already. This fails for objects within blocks that appear in more than one viewport, and there are some wacky issues with coincident faces in rhino 8 that don’t happen for me in 7.

Back to juggling tons of view display options, print previews, display colors, lack of transparency when transparency is editable, layer proliferation, By Parent doesn’t work, buggy PDF generation, print settings do not persist, viewports don’t update and clicking is required, what you see is NOT what you get, and the like.

Thank you though. I hadn’t found that post.