Blender Freezes Updating Lights in this file. #107664

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opened 2023-05-05 18:47:42 +02:00 by rohan stevenson · 5 comments

rohan stevenson commented

2023-05-05 18:47:42 +02:00

System Information
Operating system: Linux-5.19.0-41-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 525.105.17

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: (newest version of Blender that worked as expected)

Short description of error
Blender hangs updating lights in Cycles

Exact steps for others to reproduce the error
Attempting to show a rendered view in Cycles in this file results in "updating lights" and Blender hanging and becoming unresponsive.

Showing the scene in Eevee works as expected.

It may be necessary to include textures and HDRI.

I also attempted this on Windows 10 - Intel/RTX 2060 with the same result.

**System Information** Operating system: Linux-5.19.0-41-generic-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 525.105.17 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: (newest version of Blender that worked as expected) **Short description of error** Blender hangs updating lights in Cycles **Exact steps for others to reproduce the error** Attempting to show a rendered view in Cycles in this file results in "updating lights" and Blender hanging and becoming unresponsive. Showing the scene in Eevee works as expected. It may be necessary to include textures and HDRI. I also attempted this on Windows 10 - Intel/RTX 2060 with the same result.

Sky City-1.zip

73 MiB

rohan stevenson added the

labels 2023-05-05 18:47:43 +02:00

Iliya Katushenock added the

Render & Cycles

label 2023-05-05 18:49:35 +02:00

Iliya Katushenock commented

2023-05-05 19:01:37 +02:00

Member

Hello. I have a suspicion that this is a single-threaded light tree construction.
This works very well in the latest 3.6 versions. In 3.5 it freezed and 1 thread is loaded all the time. I don't think this will be fixed for 3.5, it was a new feature...

Hello. I have a suspicion that this is a single-threaded light tree construction. This works very well in the latest 3.6 versions. In 3.5 it freezed and 1 thread is loaded all the time. I don't think this will be fixed for 3.5, it was a new feature...

Iliya Katushenock added

Render & Cycles

and removed

Render & Cycles

labels 2023-05-05 19:01:56 +02:00

Brecht Van Lommel commented

2023-05-05 20:44:35 +02:00

Owner

Indeed, this can be slow in 3.5 and should be faster and less memory intensive in 3.6 due to multithreading and better handling of mesh instances.

In 3.5 you can disable the light tree in Sampling > Lights to get back the old behavior.

Indeed, this can be slow in 3.5 and should be faster and less memory intensive in 3.6 due to multithreading and better handling of mesh instances. In 3.5 you can disable the light tree in Sampling > Lights to get back the old behavior.

Brecht Van Lommel closed this issue

2023-05-05 20:44:37 +02:00

Blender Bot added

and removed

labels 2023-05-05 20:44:38 +02:00

rohan stevenson commented

2023-05-06 18:02:18 +02:00

Author

Thanks for looking at this, and yes turning off "Light Tree" did get Blender past updating lights. However it is taking a LONG time to render. For such a "simple" scene my Ryzen 3950X with an RTX3070 is taking 3 HOURS to render a single frame. Normally it would take at most a few minutes. There are volumetrics in the frame which is why it takes a while but even allowing for that - 3 hours seems excessive.

Thanks for looking at this, and yes turning off "Light Tree" did get Blender past updating lights. However it is taking a LONG time to render. For such a "simple" scene my Ryzen 3950X with an RTX3070 is taking 3 HOURS to render a single frame. Normally it would take at most a few minutes. There are volumetrics in the frame which is why it takes a while but even allowing for that - 3 hours seems excessive.

Iliya Katushenock commented

2023-05-06 18:05:33 +02:00

Member

Do you have the opportunity to check 3.6?

Do you have the opportunity to check 3.6?

rohan stevenson commented

2023-05-07 17:35:56 +02:00

Author

Ah no - I didn't know I could download it!

I have a solution for now (thankyou!) and its good to know if this crops up That ought to be an option.

Ah no - I didn't know I could download it! I have a solution for now (thankyou!) and its good to know if this crops up That ought to be an option.

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