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EEVEE-Next: Large objects crash light cache baking #121916

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opened 2024-05-17 14:49:19 +02:00 by Zsolt Stefan · 2 comments
Zsolt Stefan commented 2024-05-17 14:49:19 +02:00
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Super/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 516.93

Blender Version
Broken: version: 4.2.0 Alpha, branch: main, commit date: 2024-05-12 20:29, hash: 4a1597e39adb
Worked: Eevee Legacy 4.1.1

Short description of error
Volume light probe rendering slows to a crawl if there is a large object visible in the scene. Even larger objects have a higher performance impact, including crashing Blender consistently.

Exact steps for others to reproduce the error

  • Load example BLEND file.
  • Switch to render view, Eevee Next
  • Select Volume, go to Object Data Properties and delete the light cache
  • Bake the light cache. The resolution is set to very low (2x2x2) for testing purposes, but Blender should handle much higher resolutions.
  • Turn on the collection with the smallest ground plane, and re-bake the light cache.
  • Repeat with the next size up, until Blender crashes. For me it's at the 200 meter plane.
**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 Super/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 516.93 **Blender Version** Broken: version: 4.2.0 Alpha, branch: main, commit date: 2024-05-12 20:29, hash: `4a1597e39adb` Worked: Eevee Legacy 4.1.1 **Short description of error** Volume light probe rendering slows to a crawl if there is a large object visible in the scene. Even larger objects have a higher performance impact, including crashing Blender consistently. **Exact steps for others to reproduce the error** - Load example BLEND file. - Switch to render view, Eevee Next - Select Volume, go to Object Data Properties and delete the light cache - Bake the light cache. The resolution is set to very low (2x2x2) for testing purposes, but Blender should handle much higher resolutions. - Turn on the collection with the smallest ground plane, and re-bake the light cache. - Repeat with the next size up, until Blender crashes. For me it's at the 200 meter plane.
Eevee_Next_light_probe_bug_20250517.blend
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Zsolt Stefan added the
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Pratik Borhade commented 2024-05-18 08:23:22 +02:00
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Hi, thanks for the report. Can confirm the crash though logs are not generated. In debug build, process terminated with the error in nvoglv64.dll

I noticed high GPU usage so crash is likely related to GPU (out of memory?)

Will defer this to EEVEE devs for further investigation.

Hi, thanks for the report. Can confirm the crash though logs are not generated. In debug build, process terminated with the error in nvoglv64.dll I noticed high GPU usage so crash is likely related to GPU (out of memory?) Will defer this to EEVEE devs for further investigation.
Clément Foucault commented 2024-05-18 17:20:33 +02:00
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So the new system is creating a surfel representation of the scene inside and around the volume probe. The surfel density is fixed which can increase the memory consumption drastically even for simple scene.

So I see a few improvement that can be done here:

  • add some prints to the console so that there is some feedback about how much memory the system tries to allocate.
  • add UI feedback that the baking failed because of memory consumption.
  • try to bail early if trying to allocate ~80% of the total VRAM. Might already prevent some crashes.
  • Reduce the default distance as it might be too big for the current system as it is.

We might want to work on reducing the memory consumption of the system in the future but I would say it is too late to add these for the initial release.

So the new system is creating a surfel representation of the scene inside and around the volume probe. The surfel density is fixed which can increase the memory consumption drastically even for simple scene. So I see a few improvement that can be done here: - add some prints to the console so that there is some feedback about how much memory the system tries to allocate. - add UI feedback that the baking failed because of memory consumption. - try to bail early if trying to allocate ~80% of the total VRAM. Might already prevent some crashes. - Reduce the default distance as it might be too big for the current system as it is. We might want to work on reducing the memory consumption of the system in the future but I would say it is too late to add these for the initial release.
Clément Foucault changed title from Large objects crash light cache baking (Eevee Next) to EEVEE-Next: Large objects crash light cache baking 2024-05-18 17:20:56 +02:00
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 labels 2024-05-18 17:21:09 +02:00
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Reference: blender/blender#121916
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