Particles - Hair - Children (simple) - Random Size doesn't do anything #76731

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Prashan Subasinghe · 2020-05-14T03:35:10+02:00

2020-05-14 03:35:10 +02:00

System Information
Operating system: Windows
Graphics card: RTX Titan

Blender Version
Broken: 2.83 Beta, e71298a1da971, 2020-05-13
Worked: (newest version of Blender that worked as expected)

Short description of error

Under children there is a setting for random size, which seems to be broken (or it doesn't do anything)

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Add a particle system
change to hair
reduce number to about 10 (in order to see the error clearly)
add children. set to simple
change the random size value

**System Information** Operating system: Windows Graphics card: RTX Titan **Blender Version** Broken: 2.83 Beta, e71298a1da971, 2020-05-13 Worked: (newest version of Blender that worked as expected) **Short description of error** Under children there is a setting for random size, which seems to be broken (or it doesn't do anything) ![image.png](https://archive.blender.org/developer/F8534149/image.png) **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). Add a particle system change to hair reduce number to about 10 (in order to see the error clearly) add children. set to simple change the random size value

Prashan Subasinghe commented

2020-05-14 03:35:10 +02:00

Added subscriber: @Prashan

Philipp Oeser commented

2020-05-14 10:58:34 +02:00

Added subscribers: @Blendify, @lichtwerk

Philipp Oeser commented

2020-05-14 10:58:34 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Philipp Oeser closed this issue

2020-05-14 10:58:34 +02:00

Philipp Oeser self-assigned this 2020-05-14 10:58:34 +02:00

Philipp Oeser commented

2020-05-14 10:58:34 +02:00

This doesnt have an effect on the hair path itself, but this comes into play if you use instances with your particles.

So for example you go to Particle Properties > Render > Render As : Object then children will use the Size and Random Size
Or if you use the Particle Instance modifier, that one also has an option to use the particle children size for its instances.

So, for the original report, I'd say this is not a bug, but working as expected.

I'd say documentation is a bit misleading here:
https://docs.blender.org/manual/en/dev/physics/particles/emitter/children.html

Children are Hair and Keyed particles assigned subparticles.

This is not true, children are for Emitter particles as well (2.8 is a bit misleading here since it will not display emitter children with any visualization type other than rendering as objects/collections -- but you can have children on a emitter particles...)

Children Size: Only for Emitter. A multiplier for children size.

This is not true, children can be on hair -- and size makes a difference here as well (see above)

@Blendify: maybe we should correct this?

Anyways, I think we have to close this, thx reporting anyways!

This doesnt have an effect on the hair path itself, but this comes into play if you use instances with your particles. So for example you go to `Particle Properties` > `Render` > `Render As` : Object then children will use the `Size` and `Random Size` Or if you use the `Particle Instance` modifier, that one also has an option to use the particle children size for its instances. So, for the original report, I'd say this is not a bug, but working as expected. *** I'd say documentation is a bit misleading here: https://docs.blender.org/manual/en/dev/physics/particles/emitter/children.html > Children are Hair and Keyed particles assigned subparticles. This is not true, children are for Emitter particles as well (2.8 is a bit misleading here since it will not display emitter children with any visualization type other than rendering as objects/collections -- but you can have children on a emitter particles...) > Children Size: Only for Emitter. A multiplier for children size. This is not true, children can be on hair -- and size makes a difference here as well (see above) @Blendify: maybe we should correct this? *** Anyways, I think we have to close this, thx reporting anyways!

Aaron Carlisle commented

2020-05-15 18:24:16 +02:00

I made a few changes in rBM6659

Philipp Oeser commented

2020-05-15 18:28:57 +02:00

In #76731#932553, @Blendify wrote:
I made a few changes in rBM6659

Thx!

> In #76731#932553, @Blendify wrote: > I made a few changes in rBM6659 Thx!

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Particles - Hair - Children (simple) - Random Size doesn't do anything #76731