Cycles not rendering tail #84656

New Issue

Paul Muns · 2021-01-12T23:49:06+01:00

Paul Muns commented

2021-01-12 23:49:06 +01:00

Using : Blender-2.92.0-d4330ae70be6-macOS (Jan 10)

Horse_FixTailxx.blend

Top two screen shots show tail in Shader and Material view while being Rendered.

Strange labored render of horse's "tail" area.

Top photo: during render look at where main render is working while it still has dots around where the tail should have been. Render engine hung for 2 minutes over the tail area before proceeding normally, until it came up the right side back toward the missing tail Again engine was hung for about 30 seconds shown in the middle photo

Middle photo: hung render engine nearing missing tail. See where dots stopped at right edge.

Bottom photo: Above missing tail and render dots still calculating, look above at the numbers for Samples 81/128. All tiles have completed but each "Sample" each took 1 sec. of time to finalize the render AFTER the render looked completed. Nothing changed in the render during this extra time.

Using : Blender-2.92.0-d4330ae70be6-macOS (Jan 10) [Horse_FixTailxx.blend](https://archive.blender.org/developer/F9561599/Horse_FixTailxx.blend) 1) Top two screen shots show tail in Shader and Material view while being Rendered. ![Screen Shot Shading shows tail.png](https://archive.blender.org/developer/F9561580/Screen_Shot_Shading_shows_tail.png) ![Screen Shot 2021-01-12 at 12.11.46 PM.png](https://archive.blender.org/developer/F9561574/Screen_Shot_2021-01-12_at_12.11.46_PM.png) ![Screen Shot 2021-01-12 at 12.11.46 PM.png](https://archive.blender.org/developer/F9561563/Screen_Shot_2021-01-12_at_12.11.46_PM.png) 2) Strange labored render of horse's "tail" area. Top photo: during render look at where main render is working while it still has dots around where the tail should have been. Render engine hung for 2 minutes over the tail area before proceeding normally, until it came up the right side back toward the missing tail Again engine was hung for about 30 seconds shown in the middle photo Middle photo: hung render engine nearing missing tail. See where dots stopped at right edge. Bottom photo: Above missing tail and render dots still calculating, look above at the numbers for Samples 81/128. All tiles have completed but each "Sample" each took 1 sec. of time to finalize the render AFTER the render looked completed. Nothing changed in the render during this extra time. ![Screen Shot HorseRender 1.png](https://archive.blender.org/developer/F9561571/Screen_Shot_HorseRender_1.png) ![Screen Shot HorseRender 2.png](https://archive.blender.org/developer/F9561568/Screen_Shot_HorseRender_2.png) ![Screen Shot HorseRender 3.png](https://archive.blender.org/developer/F9561566/Screen_Shot_HorseRender_3.png)

Paul Muns commented

2021-01-12 23:49:06 +01:00

Added subscriber: @PaulM44

Alaska commented

2021-01-13 07:14:53 +01:00

Added subscriber: @Alaska

Alaska commented

2021-01-13 07:14:53 +01:00

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

Alaska commented

2021-01-13 07:14:53 +01:00

On the tail you have the diameter scale of the tail set to "0" and as a result the tail is infinitely thin which means it is invisible. It can be adjusted back to a non-zero value here while the tail object is selected:

As for why EEVEE/Material preiview is showing the tail, that is because you have EEVEE set to render hair using the strand method which does not take into consideration hair width/diameter.

On the tail you have the diameter scale of the tail set to "0" and as a result the tail is infinitely thin which means it is invisible. It can be adjusted back to a non-zero value here while the tail object is selected: ![Diameter Scale.jpg](https://archive.blender.org/developer/F9562489/Diameter_Scale.jpg) As for why EEVEE/Material preiview is showing the tail, that is because you have EEVEE set to render hair using the strand method which does not take into consideration hair width/diameter.

Robert Guetzkow commented

2021-01-13 10:07:53 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2021-01-13 10:07:53 +01:00

Above missing tail and render dots still calculating, look above at the numbers for Samples 81/128. All tiles have completed but each "Sample" each took 1 sec. of time to finalize the render AFTER the render looked completed. Nothing changed in the render during this extra time.

That is because you have activated a denoiser and it is denoising those tiles.

> Above missing tail and render dots still calculating, look above at the numbers for Samples 81/128. All tiles have completed but each "Sample" each took 1 sec. of time to finalize the render AFTER the render looked completed. Nothing changed in the render during this extra time. That is because you have activated a denoiser and it is denoising those tiles.

Robert Guetzkow commented

2021-01-13 10:08:13 +01:00

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

Robert Guetzkow closed this issue

2021-01-13 10:08:13 +01:00

Robert Guetzkow commented

2021-01-13 10:08:13 +01:00

Thank you for your report. Unfortunately, it seem that the issue is caused by misconfiguration in your scene and not a bug in Blender.

If you need help learning or using Blender, please post a question on one of our [community websites ]], for instance https:*blender.stackexchange.com/ , https:*blenderartists.org/ or the [ https:*blender.chat/channel/support | #support channel on Blender chat . The bug tracker is only for bug reports.

In case you believe that you've found a bug, please create a new bug report through Help > Report a Bug in Blender. We expect all bug reports to follow the submission template . Please provide system information (operating system, GPU, graphics driver version), affected Blender version, previous Blender version that worked properly, a short and precise description of the issue, a description of the expected behavior, step by step instructions to reproduce it and, if relevant, a minimal .blend file that showcases the problem.

Thank you for your report. Unfortunately, it seem that the issue is caused by misconfiguration in your scene and not a bug in Blender. If you need help learning or using Blender, please post a question on one of our [community websites ]], for instance [[ https:*blender.stackexchange.com/ | Blender's StackExchange ]], [[ https:*blenderartists.org/ | blenderartists.org ]] or the [[ https:*blender.chat/channel/support | #support channel on Blender chat ](https:*www.blender.org/community/). The bug tracker is only for bug reports. In case you believe that you've found a bug, please create a new bug report through *Help > Report a Bug* in Blender. We expect all bug reports to follow the [submission template ](https://developer.blender.org/maniphest/task/edit/form/1/). Please provide **system information** (operating system, GPU, graphics driver version), **affected Blender version**, previous **Blender version that worked properly**, a **short and precise description of the issue**, **a description of the expected behavior**, step by step **instructions to reproduce it** and, if relevant, a minimal .blend file that showcases the problem.

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Cycles not rendering tail #84656