Abnormally long Cycles OpenCL GPU render times with certain panoramic camera settings #51950

Closed
opened 2017-07-01 20:48:53 +02:00 by s12a · 8 comments

System Information
Windows 10 64bit
AMD Radeon RX480 4GB with 17.6.2 Radeon Software drivers

Blender Version
Broken: 2.79-testbuild1-windows64 e0bc5b5 (available here https://download.blender.org/release/Blender2.79/)

Short description of error
Using CPU rendering there is no significant difference in rendering speed between different camera modes (Perspective, Orthographic, Panoramic).
Using OpenCL GPU Rendering most panoramic camera modes appear to have an unusually long rendering time, even when using only 1 sample instead of the default 128.

Exact steps for others to reproduce the error

  • Load the default scene;
  • Set up Cycles OpenCL GPU Rendering;
  • Change the default camera settings to Panoramic;
  • Mirror ball, Fisheye Equidistant and Fisheye Equisolid appear to have a very long (perhaps infinite) render time with their default settings.

Additional information
Observation: with the Fisheye Equisolid panoramic camera setting and lens focal length of 10.50 mm, setting the camera Field Of View to 244° or more makes rendering speeds much faster. Decreasing the focal length increases the FOV angle after which render speeds appear normal and viceversa.

**System Information** Windows 10 64bit AMD Radeon RX480 4GB with 17.6.2 Radeon Software drivers **Blender Version** Broken: 2.79-testbuild1-windows64 e0bc5b5 (available here https://download.blender.org/release/Blender2.79/) **Short description of error** Using CPU rendering there is no significant difference in rendering speed between different camera modes (Perspective, Orthographic, Panoramic). Using OpenCL GPU Rendering most panoramic camera modes appear to have an unusually long rendering time, even when using only 1 sample instead of the default 128. **Exact steps for others to reproduce the error** - Load the default scene; - Set up Cycles OpenCL GPU Rendering; - Change the default camera settings to Panoramic; - Mirror ball, Fisheye Equidistant and Fisheye Equisolid appear to have a very long (perhaps infinite) render time with their default settings. **Additional information** Observation: with the Fisheye Equisolid panoramic camera setting and lens focal length of 10.50 mm, setting the camera Field Of View to 244° or more makes rendering speeds much faster. Decreasing the focal length increases the FOV angle after which render speeds appear normal and viceversa.
Author

Changed status to: 'Open'

Changed status to: 'Open'
Author

Added subscriber: @s12a

Added subscriber: @s12a
s12a changed title from Abormally long Cycles OpenCL GPU render times with certain panoramic camera settings to Abnormally long Cycles OpenCL GPU render times with certain panoramic camera settings 2017-07-01 23:05:37 +02:00

Added subscriber: @bliblubli

Added subscriber: @bliblubli

I can confirm the bug. All tiles hitting something render normally, until the edge of the view is reached (the tile at bottom right in my case). When there is nothing to render, neither geometry nor background, it hangs.
bug panoramic.JPG

I can confirm the bug. All tiles hitting something render normally, until the edge of the view is reached (the tile at bottom right in my case). When there is nothing to render, neither geometry nor background, it hangs. ![bug panoramic.JPG](https://archive.blender.org/developer/F649171/bug_panoramic.JPG)
Mai Lavelle was assigned by mathieu menuet 2017-07-02 07:33:56 +02:00

This issue was referenced by blender/cycles@5bb9ac70d9

This issue was referenced by blender/cycles@5bb9ac70d90f5d3c26eedadc5ba161dcfb9903c1
Member

Added subscribers: @MaiLavelle, @LukasStockner

Added subscribers: @MaiLavelle, @LukasStockner
Member

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'
Mai Lavelle was unassigned by Lukas Stockner 2017-07-03 18:30:23 +02:00
Lukas Stockner self-assigned this 2017-07-03 18:30:23 +02:00
Member

Fixed with 15fd758bd6, thanks for the report!

Fixed with 15fd758bd6, thanks for the report!
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Reference: blender/blender#51950
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