Maniphest T59587

Hair dynamics don't preserve lengh with Particle systems made in 2.79 when opened in 2.8
Closed, Resolved
Actions

Assigned To
Sergey Sharybin (sergey)
Authored By
Wo!262 (wo262)
Dec 18 2018, 10:09 PM
Tags
  • BF Blender
Subscribers
Brecht Van Lommel (brecht)
Kurt Kuschinski (Kukuschi)
Sebastian Parborg (zeddb)
Wo!262 (wo262)

Description

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.blend41 MBDownload

Revisions and Commits

rB Blender
rB0885484aa603 Fix T59587: Hair dynamics works different when opened in 2.8

Related Objects

Mentioned In
T60749: Hair from 2.79 messed up in 2.8 (modifiers prior to PSys and partially broken without 'Use Modifer Stack')
Mentioned Here
rB8839152abf58: Fix T59529: Auto smooth not working

Event Timeline

Wo!262 (wo262) created this task.Dec 18 2018, 10:09 PM
Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 50.Dec 19 2018, 12:01 PM
Sebastian Parborg (zeddb) added subscribers: Brecht Van Lommel (brecht), Sebastian Parborg (zeddb).

@Brecht Van Lommel (brecht) who to assign this to?

Kurt Kuschinski (Kukuschi) added a subscriber: Kurt Kuschinski (Kukuschi).Jan 22 2019, 1:54 AM
Sebastian Parborg (zeddb) assigned this task to Sergey Sharybin (sergey).Jan 28 2019, 10:15 AM
Sergey Sharybin (sergey) changed the task status from Unknown Status to Resolved by committing rB0885484aa603: Fix T59587: Hair dynamics works different when opened in 2.8.Feb 7 2019, 11:49 AM
Sergey Sharybin (sergey) added a commit: rB0885484aa603: Fix T59587: Hair dynamics works different when opened in 2.8.
Sergey Sharybin (sergey) added a comment.Feb 7 2019, 11:49 AM

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.

Wo!262 (wo262) added a comment.Feb 8 2019, 12:35 PM

Thank you! I love it ?

Philipp Oeser (lichtwerk) mentioned this in T60749: Hair from 2.79 messed up in 2.8 (modifiers prior to PSys and partially broken without 'Use Modifer Stack').Jul 11 2019, 2:37 PM