Sky Texture and Shadow Terminator Problem #78145

Closed
opened 2020-06-23 03:26:00 +02:00 by Joshua Merrill · 12 comments

System Information
OS Name Microsoft Windows 10 Home
Version 10.0.18363 Build 18363
System Type x64-based PC
Processor AMD Ryzen Threadripper 1920X 12-Core Processor, 3500 Mhz, 12 Core(s), 24 Logical Processor(s)
Installed Physical Memory (RAM) 32.0 GB
Total Physical Memory 31.9 GB
Available Physical Memory 14.7 GB
Total Virtual Memory 51.9 GB
Available Virtual Memory 5.38 GB
NVIDIA GeForce GTX TITAN
NVIDIA GeForce GTX TITAN
Radeon (TM) RX 480 Graphics
Radeon (TM) RX 480 Graphics

Blender Version
Blender 2.90 Alpha June 22 nightly build

Short description of error
The Sky Texture for the World and Shadow Terminator for Objects seem to be acting unexpectedly.

Exact steps for others to reproduce the error
Add a Cube and a sky texture. adjust the sun to be at a low angle and adjust the object shadow terminator.

here are some screenshots:
https://xd.adobe.com/view/eb50ef4b-db83-48d7-b34d-e68d374950e6-be03/{F8637855}

**System Information** OS Name Microsoft Windows 10 Home Version 10.0.18363 Build 18363 System Type x64-based PC Processor AMD Ryzen Threadripper 1920X 12-Core Processor, 3500 Mhz, 12 Core(s), 24 Logical Processor(s) Installed Physical Memory (RAM) 32.0 GB Total Physical Memory 31.9 GB Available Physical Memory 14.7 GB Total Virtual Memory 51.9 GB Available Virtual Memory 5.38 GB NVIDIA GeForce GTX TITAN NVIDIA GeForce GTX TITAN Radeon (TM) RX 480 Graphics Radeon (TM) RX 480 Graphics **Blender Version** Blender 2.90 Alpha June 22 nightly build **Short description of error** The Sky Texture for the World and Shadow Terminator for Objects seem to be acting unexpectedly. **Exact steps for others to reproduce the error** Add a Cube and a sky texture. adjust the sun to be at a low angle and adjust the object shadow terminator. here are some screenshots: https://xd.adobe.com/view/eb50ef4b-db83-48d7-b34d-e68d374950e6-be03/{F8637855}
Author

Added subscriber: @JoshuaMerrill

Added subscriber: @JoshuaMerrill
Author
If that link doesn't work, try this one: https://xd.adobe.com/view/eb50ef4b-db83-48d7-b34d-e68d374950e6-be03/
Member

Added subscriber: @nacioss

Added subscriber: @nacioss
Member

Please can you attach the blend file here? I would like to give a look at the issue.

Please can you attach the blend file here? I would like to give a look at the issue.

Added subscriber: @brecht

Added subscriber: @brecht

Changed status from 'Needs Triage' to: 'Needs User Info'

Changed status from 'Needs Triage' to: 'Needs User Info'

We require an example .blend file for bug reports.

We require an example .blend file for bug reports.
Author
[SkyAndShadowTerminatorProblem.blend](https://archive.blender.org/developer/F8639745/SkyAndShadowTerminatorProblem.blend) here is the file
Member

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'
Member

Screenshot from 2020-06-24 15-58-19.png
Added a sun lamp to replicate.. it seems like the issue is not related to the Sky Texture, but to everything really. @brecht are you the developer of the shadow terminator? there might be an issue.

![Screenshot from 2020-06-24 15-58-19.png](https://archive.blender.org/developer/F8640706/Screenshot_from_2020-06-24_15-58-19.png) Added a sun lamp to replicate.. it seems like the issue is not related to the Sky Texture, but to everything really. @brecht are you the developer of the shadow terminator? there might be an issue.

Changed status from 'Needs Developer To Reproduce' to: 'Archived'

Changed status from 'Needs Developer To Reproduce' to: 'Archived'
Brecht Van Lommel self-assigned this 2020-06-24 16:15:00 +02:00

I don't see a bug here. The shadow terminator setting will add additional shadowing, which is not physically correct but masks shadow terminator issues. You need to tweak the value to find the right trade-off, and in some cases just adding more subdivisions is the only solution.

I don't see a bug here. The shadow terminator setting will add additional shadowing, which is not physically correct but masks shadow terminator issues. You need to tweak the value to find the right trade-off, and in some cases just adding more subdivisions is the only solution.
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Reference: blender/blender#78145
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