"Forces for growing hair" doesn't preserve hair length #69738

New Issue

Adam Stankiewicz · 2019-09-11T02:19:49+02:00

Adam Stankiewicz commented

2019-09-11 02:19:49 +02:00

System Information
Operating system: Darwin-18.5.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel(R) Iris(TM) Graphics 6100 Intel Inc. 4.1 INTEL-12.8.38

Blender Version
Broken: version: 2.81 (sub 9), branch: master, commit date: 2019-09-09 17:22, hash: 6be3348505
Worked: (optional)

It doesn't work on 2.8 as well

Short description of error

When using "Use for Growing Hair" in "Field Weights" I'd expect that selected forces will be used for modelling hair, but the total hair length will be the same as specified in "Hair Length" field. Instead forces affect hair length as well.

Using forces for modelling hair would be very useful (e.g. to simulate collision with head and avoid buggy Dynamic Hair that requires animation steps) but currently is not very usable because of this issue.

Could Blender make constraint when using forces for growing hair so each grown segment is of equal length? (i.e. make forces affect direction of hair, not their length).

**System Information** Operating system: Darwin-18.5.0-x86_64-i386-64bit 64 Bits Graphics card: Intel(R) Iris(TM) Graphics 6100 Intel Inc. 4.1 INTEL-12.8.38 **Blender Version** Broken: version: 2.81 (sub 9), branch: master, commit date: 2019-09-09 17:22, hash: `6be3348505` Worked: (optional) It doesn't work on 2.8 as well **Short description of error** When using "Use for Growing Hair" in "Field Weights" I'd expect that selected forces will be used for modelling hair, but the total hair length will be the same as specified in "Hair Length" field. Instead forces affect hair length as well. Using forces for modelling hair would be very useful (e.g. to simulate collision with head and avoid buggy Dynamic Hair that requires animation steps) but currently is not very usable because of this issue. Could Blender make constraint when using forces for growing hair so each grown segment is of equal length? (i.e. make forces affect direction of hair, not their length).

Adam Stankiewicz commented

2019-09-11 02:19:49 +02:00

Added subscriber: @sheerun

Brecht Van Lommel commented

2019-09-13 09:57:11 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-09-13 09:57:11 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2019-09-13 09:57:11 +02:00

Brecht Van Lommel self-assigned this 2019-09-13 09:57:11 +02:00

Brecht Van Lommel commented

2019-09-13 09:57:11 +02:00

This kind of feedback is outside the scope of the bug tracker, please use other channels:
https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

This kind of feedback is outside the scope of the bug tracker, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

Adam Stankiewicz commented

2019-09-13 10:54:08 +02:00

This is not feedback, this is bug: hair length was set but it's not grown to given length

Brecht Van Lommel commented

2019-09-13 11:08:52 +02:00

The hair length specified is the initial hair length before forces are applied, that's the intended behavior currently and possible improvements to that are outside the scope of the bug tracker.

Adam Stankiewicz commented

2019-09-13 11:14:59 +02:00

Would you accept PR that allows to change this behavior? (e.g. "Preserve max length" checkbox)?

Brecht Van Lommel commented

2019-09-13 11:23:31 +02:00

The particle system is currently end of life and waiting to be replaced, normally we will not add new features to it anymore.
https://wiki.blender.org/wiki/Modules#Nodes_.26_Physics

If it's a simple change we might accept it, but in general I would not recommend working on that area.

The particle system is currently end of life and waiting to be replaced, normally we will not add new features to it anymore. https://wiki.blender.org/wiki/Modules#Nodes_.26_Physics If it's a simple change we might accept it, but in general I would not recommend working on that area.

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"Forces for growing hair" doesn't preserve hair length #69738