Hair dynamics don't preserve lengh with Particle systems made in 2.79 when opened in 2.8 #59587

New Issue

msalv · 2018-12-18T22:09:21+01:00

msalv commented

2018-12-18 22:09:21 +01:00

System Information
Windows 10 64, nvidia 1060

Blender Version
Broken:blender-2.80.0-git.8839152abf5-windows64
Worked: 2.79

Short description of error
When opening hair made in 2.79 into 2.8, the hair dymanics don't preserve the length of the hair, falling and elongating infinitely down. On the other hand, hair made in 2.8 to begin with the same settings does preserve lengh and fall correctly.

Things that I tried that don't work:
Grooming the hair a little, changing hair dynamic settings, changing particle settings, deleting the cache and baking again.

The only thing that works is deleting the particle system and creating a new one, which wouldn't be a big deal if not for the fact that it destroys your grooming work and you have to start from zero, that's why I report it as a bug.

Exact steps for others to reproduce the error
Open the blend file and press Play. Left is a particle system made in 2.79 opened in 2.8, right is one made in 2.8. The hair dynamic settings of both are the same
hairbug.blend

**System Information** Windows 10 64, nvidia 1060 **Blender Version** Broken:blender-2.80.0-git.8839152abf5-windows64 Worked: 2.79 **Short description of error** When opening hair made in 2.79 into 2.8, the hair dymanics don't preserve the length of the hair, falling and elongating infinitely down. On the other hand, hair made in 2.8 to begin with the same settings does preserve lengh and fall correctly. Things that I tried that don't work: Grooming the hair a little, changing hair dynamic settings, changing particle settings, deleting the cache and baking again. The only thing that works is deleting the particle system and creating a new one, which wouldn't be a big deal if not for the fact that it destroys your grooming work and you have to start from zero, that's why I report it as a bug. **Exact steps for others to reproduce the error** Open the blend file and press Play. Left is a particle system made in 2.79 opened in 2.8, right is one made in 2.8. The hair dynamic settings of both are the same [hairbug.blend](https://archive.blender.org/developer/F5996913/hairbug.blend)

msalv commented

2018-12-18 22:09:21 +01:00

Added subscriber: @moisessalvador

Sebastian Parborg commented

2018-12-19 12:01:23 +01:00

Added subscribers: @brecht, @ZedDB

Sebastian Parborg commented

2018-12-19 12:01:23 +01:00

@brecht who to assign this to?

Kurt Kuschinski commented

2019-01-22 01:54:26 +01:00

Added subscriber: @Kukuschi

Sergey Sharybin was assigned by Sebastian Parborg

2019-01-28 10:15:35 +01:00

blender-admin commented

2019-02-07 11:46:17 +01:00

This issue was referenced by 0885484aa6

This issue was referenced by 0885484aa60336f601c0ea8042f82172198ec7ef

Sergey Sharybin commented

2019-02-07 11:49:00 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2019-02-07 11:49:00 +01:00

Sergey Sharybin commented

2019-02-07 11:49:51 +01:00

Just so it's mentioned here.

Thew issue is solved in terms that opening 2.7 files should do proper simulation now.

For the existing files which had simulation originally saved in 2.7 and then re-saved in 2.8 we'd accept breaking change. Is a bit tricky to tell old and new simulation apart, and we don't want to ruin new simulation by accident.

Just so it's mentioned here. Thew issue is solved in terms that opening 2.7 files should do proper simulation now. For the existing files which had simulation originally saved in 2.7 and then re-saved in 2.8 we'd accept breaking change. Is a bit tricky to tell old and new simulation apart, and we don't want to ruin new simulation by accident.

msalv commented

2019-02-08 12:35:02 +01:00

Thank you! I love it ?

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Hair dynamics don't preserve lengh with Particle systems made in 2.79 when opened in 2.8 #59587