Hair Particles Not Displaying in Viewport #60171

New Issue

Dan Legnard · 2019-01-05T00:19:43+01:00

Dan Legnard commented

2019-01-05 00:19:43 +01:00

System Information
Operating system: Mac OSX El Capitan
Graphics card: NVIDIA GeForce GTX 670 4095 MB

Blender Version
Broken: 2.80, 2c21e3e35f

Short description of error
• For hair particle systems, only a single strand is displayed in the viewport.
• Hair is rendered correctly in cycles, but not EEVEE.
• In some recent builds, particle edit mode works and displays parent particles correctly, but in current build switching to particle edit mode crashes Blender.
• Location of single strand displayed changes if number of particles is changed. Setting particle count to 0 crashes Blender.

Exact steps for others to reproduce the error
Default Cube > New Particle System > Change type to Hair > Default value is 1000: Only one strand displayed in viewport

**System Information** Operating system: Mac OSX El Capitan Graphics card: NVIDIA GeForce GTX 670 4095 MB **Blender Version** Broken: 2.80, 2c21e3e35f30 **Short description of error** • For hair particle systems, only a single strand is displayed in the viewport. • Hair is rendered correctly in cycles, but not EEVEE. • In some recent builds, particle edit mode works and displays parent particles correctly, but in current build switching to particle edit mode crashes Blender. • Location of single strand displayed changes if number of particles is changed. Setting particle count to 0 crashes Blender. **Exact steps for others to reproduce the error** Default Cube > New Particle System > Change type to Hair > Default value is 1000: Only one strand displayed in viewport ![viewport.jpg](https://archive.blender.org/developer/F6177453/viewport.jpg) ![cycles.jpg](https://archive.blender.org/developer/F6177459/cycles.jpg)

Dan Legnard commented

2019-01-05 00:19:43 +01:00

Added subscriber: @DanielLegnard

William Reynish commented

2019-01-05 00:49:07 +01:00

Added subscribers: @fclem, @WilliamReynish

William Reynish commented

2019-01-05 00:49:07 +01:00

Same issue here. @fclem?

Sebastian Parborg commented

2019-01-25 12:12:27 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-01-25 12:12:27 +01:00

@WilliamReynish are you using OSX too?

I can not reproduce this on my side (linux). Is this still an issue for you guys with the latest build?

I think this might be related to #59426 (OSX too)

@WilliamReynish are you using OSX too? I can not reproduce this on my side (linux). Is this still an issue for you guys with the latest build? I think this might be related to #59426 (OSX too)

Dan Legnard commented

2019-01-26 14:40:14 +01:00

Still the same issue in the latest build, except for the last bullet point above (Blender no longer crashes if there are 0 hair particles).

Dan Legnard commented

2019-02-05 21:58:18 +01:00

On a whim, I decided to try today's build (08ab09cf04) on my wife's computer (an older Apple laptop), and it seems to work properly there, but it is still broken on my machine.

Another point to note that I missed in my initial description: when the particle type is switched to hair, the hair roots do not show up in the proper position on the mesh: they usually appear to be at the infinity point of either the x or y axis. The strand tip is in the right spot, leading to weird effects in the viewport. Hiding and then un-hiding the particle system fixes this problem. This happened on my wife's laptop as well, but with all the strands showing at the outset instead of just a single one.

Not to be a nag, but I really hope this can be fixed soon. Hair is a key part of my workflow and not being able to see it in the viewport at all in 2.8 has effectively kept me from using the new version thus far.

On a whim, I decided to try today's build (08ab09cf04d9) on my wife's computer (an older Apple laptop), and it seems to work properly there, but it is still broken on my machine. Another point to note that I missed in my initial description: when the particle type is switched to hair, the hair roots do not show up in the proper position on the mesh: they usually appear to be at the infinity point of either the x or y axis. The strand tip is in the right spot, leading to weird effects in the viewport. Hiding and then un-hiding the particle system fixes this problem. This happened on my wife's laptop as well, but with all the strands showing at the outset instead of just a single one. Not to be a nag, but I really hope this can be fixed soon. Hair is a key part of my workflow and not being able to see it in the viewport at all in 2.8 has effectively kept me from using the new version thus far.

Clément Foucault was assigned by Sebastian Parborg

2019-02-05 22:02:41 +01:00

Gabriel Moro commented

2019-02-06 01:33:28 +01:00

Added subscriber: @GabrielMoro

Gabriel Moro commented

2019-02-06 01:33:28 +01:00

Same happens to me. Hair shows but only up to a limit.
When you increase resolution or hair quantity (normal or children) it stops displaying or rendering.
It still renders on Cycles.

The same hair shows perfectly in 2.79 just by copying to it...
Latest 2.80 build here.

Same happens to me. Hair shows but only up to a limit. When you increase resolution or hair quantity (normal or children) it stops displaying or rendering. It still renders on Cycles. The same hair shows perfectly in 2.79 just by copying to it... Latest 2.80 build here.

Jari Aaltonen commented

2019-02-12 20:32:15 +01:00

Added subscriber: @jaalto-3

Jari Aaltonen commented

2019-02-12 20:32:15 +01:00

Same problem here. Only one hair visible in viewport. Particle edit mode, all hairs visible okay. Switch to Cycles, still one hair visible on wireframe and solid view. But Cycles rendered view shows hairs. Eevee doesn't.

Version: blender-2.80.0-git20190212.d3870471edd7-x86_64
Mac OSX El Capitan.

Same problem here. Only one hair visible in viewport. Particle edit mode, all hairs visible okay. Switch to Cycles, still one hair visible on wireframe and solid view. But Cycles rendered view shows hairs. Eevee doesn't. Version: blender-2.80.0-git20190212.d3870471edd7-x86_64 Mac OSX El Capitan.

blender-admin commented

2019-02-28 22:56:27 +01:00

This issue was referenced by 680c7209ec

This issue was referenced by 680c7209ecf7315a9818923daf62ae9b1cd4c26b

Clément Foucault commented

2019-02-28 22:56:58 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-02-28 22:56:58 +01:00

Dan Legnard commented

2019-03-02 15:27:44 +01:00

Changed status from 'Resolved' to: 'Open'

Dan Legnard reopened this issue

2019-03-02 15:27:44 +01:00

Dan Legnard commented

2019-03-02 15:27:44 +01:00

Thank you for your hard work on this. Unfortunately, commit 680c7209ec hasn't resolved the issue as of today's build b5d87f8028. Hair particle behavior in the viewport remains the same, as described above.

The single visible hair strand does behave exactly as expected, following changes made in particle edit mode, casting a shadow in rendered mode, and displaying the correct viewport color. It would just be nice to be able to see the rest of them.

I did test Blender a few days ago with an ancient ATI card installed in the same machine, and hair particles worked, so it seems specific to Nvidia cards (in my case a GTX 670). I have tested with both OSXs default drivers and the most recent Nvidia Web Drivers and the same problem happens with both.

Thank you for your hard work on this. Unfortunately, commit 680c7209ec hasn't resolved the issue as of today's build b5d87f802806. Hair particle behavior in the viewport remains the same, as described above. The single visible hair strand does behave exactly as expected, following changes made in particle edit mode, casting a shadow in rendered mode, and displaying the correct viewport color. It would just be nice to be able to see the rest of them. I did test Blender a few days ago with an ancient ATI card installed in the same machine, and hair particles worked, so it seems specific to Nvidia cards (in my case a GTX 670). I have tested with both OSXs default drivers and the most recent Nvidia Web Drivers and the same problem happens with both.

Clément Foucault commented

2019-03-04 02:09:02 +01:00

Soo it might be a problem with the buffer texture and not with the feedback transform.... I'll try to make yet another workaround for this, but I hate that we need to get creative just to workaround a driver bug.

Dan Legnard commented

2019-03-07 18:22:19 +01:00

Yeah, it's frustrating for sure, but I think I speak for a lot of us when I say we really appreciate your commitment to supporting Blender on Mac despite all of Apple's software issues.

I don't know if this is related to the same drawing code or if it's a separate bug, but I discovered that if you switch the particle type to hair, and then back to emitter, the emitter particle visualization disappears from the viewport (it works just fine when creating a new particle system).

Yeah, it's frustrating for sure, but I think I speak for a lot of us when I say we really appreciate your commitment to supporting Blender on Mac despite all of Apple's software issues. I don't know if this is related to the same drawing code or if it's a separate bug, but I discovered that if you switch the particle type to hair, and then back to emitter, the emitter particle visualization disappears from the viewport (it works just fine when creating a new particle system).

yvt commented

2019-03-09 13:25:47 +01:00

Added subscriber: @TomoakiKawada

yvt commented

2019-03-09 13:25:47 +01:00

Adding a dummy vertex attribute read fixed this issue on my machine (macOS 10.14.4 Beta, Radeon R9 M295X). It seems like a driver bug triggered by shaders without vertex reads. I submitted the patch as D4490.

Adding a dummy vertex attribute read fixed this issue on my machine (macOS 10.14.4 Beta, Radeon R9 M295X). It seems like a driver bug triggered by shaders without vertex reads. I submitted the patch as [D4490](https://archive.blender.org/developer/D4490).

blender-admin commented

2019-03-10 03:36:27 +01:00

This issue was referenced by 9ad156374f

This issue was referenced by 9ad156374f599aa585b3cc49b54a8d48f10c60d6

Clément Foucault commented

2019-03-10 03:57:33 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-03-10 03:57:33 +01:00

Gabriel Moro commented

2019-03-10 20:36:31 +01:00

It sadly isn't solved on todays build... Will it come in another build?

It sadly isn't solved on todays build... Will it come in another build? ![Screen Shot 2019-03-10 at 16.32.32.png](https://archive.blender.org/developer/F6796425/Screen_Shot_2019-03-10_at_16.32.32.png)

yvt commented

2019-03-11 09:52:29 +01:00

Yes, the build including the fix ("March 11, 00:40:15 - 6fd11a21f5c5”) was released 8 hours ago.

Gabriel Moro commented

2019-03-11 17:10:42 +01:00

Omg! Can't believe this is actually working now. Thanks a lot for your work!!! :)

Bernard Mutai commented

2021-09-15 19:14:49 +02:00

Added subscriber: @mutaib

Bernard Mutai commented

2021-09-15 19:14:49 +02:00

Laptop 3 generation, 2.6ghz, graphic card 4000... Facing same problem with version 2.93... but with 2.8 iy shows hair well.. is there a way the issue can be solved? Or we have to change our computers..

Bernard Mutai commented

2021-09-17 10:41:01 +02:00

I solved my problem by installing ubuntu and not using the windows 10 i had.

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Hair Particles Not Displaying in Viewport #60171