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Hair particles: rekeying resets particles weight.
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
Worked: (optional)

Short description of error
I want to shape the hair particles with few steps for better control and rekey them for better collision in hair dynamics but all particle weight will be set to 0 as I do it. the problem was back in blender 2.79b.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

Related Objects

Event Timeline

Alireza (Radical) created this task.Jul 20 2019, 9:21 AM
Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 30.Jul 30 2019, 12:46 PM
Sebastian Parborg (zeddb) added a subscriber: Sebastian Parborg (zeddb).

Can you attach an example file with some short steps on how to reproduce?

Alireza (Radical) added a comment.Jul 30 2019, 2:14 PM

examples

Hair_rekeying.blend131 KBDownload
Blend File

Blender Hair rekeyingSL.mkv863 KBDownload
Video

anyway, weight painting hair particles in blender is painfull and impossible, If I could choose hair particles and rekey them, then set a weight for root and a weight for tip and gradient weight mid particles helps a lot.

Concept image

if anyday you concidered working on hair particle system, please add hair length option to Add Brush

Sebastian Parborg (zeddb) lowered the priority of this task from 30 to Low.Jul 30 2019, 3:12 PM

We are going to rewrite the particle system completely. So this will probably not be fixed until then.

Philipp Oeser (lichtwerk) claimed this task.Jul 30 2019, 3:35 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

Will put on my desk to check if this a quick thing to fix...

Philipp Oeser (lichtwerk) renamed this task from hair particle rekeying resets particles weight. to Hair particles: rekeying resets particles weight..Sep 4 2019, 2:13 PM
Philipp Oeser (lichtwerk) added a project: Nodes & Physics.
Garry R. Osgood (grosgood) mentioned this in T62993: Hair particles: rekeying, cut tool, subdividing do not interpolate existing weights (breaking simulation).Nov 6 2019, 12:24 AM
Philipp Oeser (lichtwerk) added a comment.Nov 20 2019, 12:43 PM

Will merge this into T62993: Hair particles: rekeying, cut tool, subdividing do not interpolate existing weights (breaking simulation) since these are all on the same page...

Philipp Oeser (lichtwerk) closed this task as a duplicate of T62993: Hair particles: rekeying, cut tool, subdividing do not interpolate existing weights (breaking simulation).Nov 20 2019, 12:44 PM