Very bright lights appear black in Cycles when the rendering is completed #98959

Closed
opened 2022-06-17 19:34:24 +02:00 by Sebastien Larocque · 7 comments

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.96

Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691
Worked: Tested and worked in version 2.93

Short description of error
Very bright lights appear black in Cycles when the rendering is completed

Exact steps for others to reproduce the error

  • Open the sample project in attachment.
  • Render the scene as it is.

My bug report seems related to this one: https://developer.blender.org/T98270. I decided to test with the latest build, but the problem is still present. I don’t know if the problem has been fixed or not. In my bug report, there is different information not mentioned in the previous report. Here are the facts.

  • The problem occurred recently. I never had this problem before.
  • When rendering a Nishita sky with the default parameters, the sun and its reflections are black.
  • Strangely, the black pixels appear only when the rendering is done. Otherwise, during the rendering, at every sample, the color is accurate.
  • The problem is only in the render window. After the rendering, when I saved the image to a file from the render window, the image on the disk had the right colors. I presume the pixels in the buffer are accurate, but the problem might by complex.
  • I decide to test with different settings in the Nishita sky and to add two point lights. For the Nishita sky, playing with the “Sun Intensity” and the “Strength” allowed me to find a workaround.

VeryBrightLightsRenderBug.blend

Rendered result - Iin the render window.jpg

Rendered result - Saved rendering.png

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.96 **Blender Version** Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: `e05e1e3691` Worked: Tested and worked in version 2.93 **Short description of error** Very bright lights appear black in Cycles when the rendering is completed **Exact steps for others to reproduce the error** * Open the sample project in attachment. * Render the scene as it is. My bug report seems related to this one: https://developer.blender.org/T98270. I decided to test with the latest build, but the problem is still present. I don’t know if the problem has been fixed or not. In my bug report, there is different information not mentioned in the previous report. Here are the facts. * The problem occurred recently. I never had this problem before. * When rendering a Nishita sky with the default parameters, the sun and its reflections are black. * Strangely, the black pixels appear only when the rendering is done. Otherwise, during the rendering, at every sample, the color is accurate. * The problem is only in the render window. After the rendering, when I saved the image to a file from the render window, the image on the disk had the right colors. I presume the pixels in the buffer are accurate, but the problem might by complex. * I decide to test with different settings in the Nishita sky and to add two point lights. For the Nishita sky, playing with the “Sun Intensity” and the “Strength” allowed me to find a workaround. [VeryBrightLightsRenderBug.blend](https://archive.blender.org/developer/F13179798/VeryBrightLightsRenderBug.blend) ![Rendered result - Iin the render window.jpg](https://archive.blender.org/developer/F13179799/Rendered_result_-_Iin_the_render_window.jpg) ![Rendered result - Saved rendering.png](https://archive.blender.org/developer/F13179801/Rendered_result_-_Saved_rendering.png)

Added subscriber: @SebBlender

Added subscriber: @SebBlender
Member

Added subscribers: @lichtwerk, @PratikPB2123

Added subscribers: @lichtwerk, @PratikPB2123
Member

Thanks for the report. I've not been able to repro this in 3.3 with CPU.
Like #98270, is this also a GPU only issue? @lichtwerk , can you replicate this?

Thanks for the report. I've not been able to repro this in 3.3 with CPU. Like #98270, is this also a GPU only issue? @lichtwerk , can you replicate this?
Member

Maybe same as #98575 (Issues with HDRIs and render result pixel values that exceed half float limits)

Maybe same as #98575 (Issues with HDRIs and render result pixel values that exceed half float limits)
Member

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'
Member

Yes, can confirm, will check

Yes, can confirm, will check

Closed as duplicate of #98575

Closed as duplicate of #98575
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Reference: blender/blender#98959
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