Hair particles: hair particle rekey disolves the hair, then crashes Blender #69488

New Issue

Yegor · 2019-09-04T13:57:53+02:00

Yegor commented

2019-09-04 13:57:53 +02:00

System Information
Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56

Blender Version
Broken: version: 2.81 (sub 4), branch: master, commit date: 2019-09-02 15:37, hash: 283d96de11
Worked: 2.79

Short description of error
Trying rekeying a hair breaks the strand, then leads crashes with the keys number > 6

That worked in 2.79, but for some reason the hair behaved like there is still the starting number of keys. And what's the difference between rekeying and subdividing?

Exact steps for others to reproduce the error

Open the file attached
Go into particle edit mode
Select a hair
Go to rekey
Increase the number of keys until the hair disappears, then crash.

hair_particles_rekey_crash.blend

**System Information** Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56 **Blender Version** Broken: version: 2.81 (sub 4), branch: master, commit date: 2019-09-02 15:37, hash: `283d96de11` Worked: 2.79 **Short description of error** Trying rekeying a hair breaks the strand, then leads crashes with the keys number > 6 That worked in 2.79, but for some reason the hair behaved like there is still the starting number of keys. And what's the difference between rekeying and subdividing? **Exact steps for others to reproduce the error** Open the file attached Go into particle edit mode Select a hair Go to rekey Increase the number of keys until the hair disappears, then crash. [hair_particles_rekey_crash.blend](https://archive.blender.org/developer/F7716291/hair_particles_rekey_crash.blend)

Yegor commented

2019-09-04 13:57:53 +02:00

Added subscriber: @YegorSmirnov

Philipp Oeser commented

2019-09-04 14:28:05 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-09-04 14:28:06 +02:00

Can confirm this.
This might just be a viewport drawing thingie, needs more investigation...

That worked in 2.79, but for some reason the hair behaved like there is still the starting number of keys.

That is because if you increase the number of keys, you also need to increase the number of drawing steps
In 2.8 this is Sidebar > Tool > Options > Viewport Display > Paths steps
In 2.79 this is Toolbar > Tools >Options > Draw > Paths steps

And what's the difference between rekeying and subdividing?

Well rekeying will allow for an arbitrary number of keys [could be lower than the original as well], whereas subdivide only gives you double the amount of keys...

As usual I would like to point out that Hair editing/dynamics are in a bad state in 2.8, (I am going over reports atm -- there are lots of regressions), and I would not hold my breath for timely fixes, since hair is basically EOL, see https://wiki.blender.org/wiki/Modules.
I still think it is good to gather all the issues (so thx for reporting!), either to fix these or to have an example of what the new system needs to take care of...

Can confirm this. This might just be a viewport drawing thingie, needs more investigation... > That worked in 2.79, but for some reason the hair behaved like there is still the starting number of keys. That is because if you increase the number of keys, you also need to increase the number of drawing steps In 2.8 this is `Sidebar` > `Tool` > `Options` > `Viewport Display` > `Paths steps` In 2.79 this is `Toolbar` > `Tools` >`Options` > `Draw` > `Paths steps` > And what's the difference between rekeying and subdividing? Well rekeying will allow for an arbitrary number of keys [could be lower than the original as well], whereas subdivide only gives you double the amount of keys... As usual I would like to point out that Hair editing/dynamics are in a bad state in 2.8, (I am going over reports atm -- there are lots of regressions), and I would not hold my breath for timely fixes, since hair is basically EOL, see https://wiki.blender.org/wiki/Modules. I still think it is good to gather all the issues (so thx for reporting!), either to fix these or to have an example of what the new system needs to take care of...

blender-admin commented

2019-09-26 17:24:29 +02:00

This issue was referenced by cf2c09002f

This issue was referenced by cf2c09002fae1e5b11acc0f21b67ffb29212ad7a

Philipp Oeser commented

2019-09-26 17:34:06 +02:00

Changed status from 'Open' to: 'Resolved'

Philipp Oeser closed this issue

2019-09-26 17:34:06 +02:00

Philipp Oeser self-assigned this 2019-09-26 17:34:06 +02:00

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Hair particles: hair particle rekey disolves the hair, then crashes Blender #69488