invisible hair particles slowing down mesh edits #40057

New Issue

Sir Torx Screwdriver · 2014-05-06T23:20:14+02:00

2014-05-06 23:20:14 +02:00

System Information
windows 8.1 pro
nvidia gtx 670

Blender Version
Broken: (2.70 19e627c)
Worked: not applicable

Short description of error

Entering edit mode on an object with a particle hair system will stop displaying the hair, but there's still a massive slowdown on any edit mode modification done. Disabling the particle system display in the modifier stack will still show only the particle source mesh in edit mode, but moving vertices around is at interactive speed again.

Exact steps for others to reproduce the error
[you can use the provided blend file and increase the number of particles until your viewport starts to feel a bit slower, thats 1m on my system but I've left it low in the file so that it opens quickly and you can turn up the particle count toward your PCs limit yourself]

So here's the issue in detail:

I have 1 million hair particles on a sphere

object mode: tumbling around in the viewport lags a bit

entering edit mode: the 1M hairs are no longer being displayed

now all I have onscreen is ~1k triangles and tumbling around in the viewport now is perfectly stable again.

as soon as I grab a vertex and try moving it around I get a significant slowdown. Apparently the fur is computed in the background, even though it's not being drawn on screen.

Now if you switch off the particle system display in the modifier stack (which will still show only the particle source object in edit mode) >> editing the mesh performs just as editing a 1k tris mesh normally does.

thanks for your time!

**System Information** windows 8.1 pro nvidia gtx 670 **Blender Version** Broken: (2.70 19e627c) Worked: not applicable **Short description of error** Entering edit mode on an object with a particle hair system will stop displaying the hair, but there's still a massive slowdown on any edit mode modification done. Disabling the particle system display in the modifier stack will still show only the particle source mesh in edit mode, but moving vertices around is at interactive speed again. **Exact steps for others to reproduce the error** [you can use the provided blend file and increase the number of particles until your viewport starts to feel a bit slower, thats 1m on my system but I've left it low in the file so that it opens quickly and you can turn up the particle count toward your PCs limit yourself] So here's the issue in detail: I have 1 million hair particles on a sphere object mode: tumbling around in the viewport lags a bit entering edit mode: the 1M hairs are no longer being displayed now all I have onscreen is ~1k triangles and tumbling around in the viewport now is perfectly stable again. as soon as I grab a vertex and try moving it around I get a significant slowdown. Apparently the fur is computed in the background, even though it's not being drawn on screen. Now if you switch off the particle system display in the modifier stack (which will still show only the particle source object in edit mode) >> editing the mesh performs just as editing a 1k tris mesh normally does. thanks for your time!

Sir Torx Screwdriver commented

2014-05-06 23:20:14 +02:00

Changed status to: 'Open'

Sir Torx Screwdriver commented

2014-05-06 23:20:14 +02:00

Added subscriber: @particleemitter

Kévin Dietrich commented

2014-05-09 16:18:55 +02:00

Added subscriber: @kevindietrich

Kévin Dietrich commented

2014-05-09 16:18:55 +02:00

The blendfile is missing. Simply drag and drop it in the comment box.

Sir Torx Screwdriver commented

2014-05-12 08:53:29 +02:00

hair_particles_editmode-lag.blend

Aha! Thanks for the heads up, the file should be there now

[ another copy of the file on PasteAll, just in case :) http://www.pasteall.org/blend/29112 ]

[hair_particles_editmode-lag.blend](https://archive.blender.org/developer/F88594/hair_particles_editmode-lag.blend) Aha! Thanks for the heads up, the file should be there now [ another copy of the file on PasteAll, just in case :) http://www.pasteall.org/blend/29112 ]

Sir Torx Screwdriver commented

2014-05-22 23:49:33 +02:00

replicated this exact issue on another machine at work today

Sergey Sharybin commented

2014-06-09 13:19:49 +02:00

Added subscribers: @LukasTonne, @Sergey

Sergey Sharybin commented

2014-06-09 13:19:49 +02:00

Particles are being updated for objects in edit mode.. Here's a patch which skips this: http://www.pasteall.org/52126/diff

Seems hair is being properly updated when leaving edit mode, but before commit wouldn't mind having @LukasTonne's eyes on this..

Particles are being updated for objects in edit mode.. Here's a patch which skips this: http://www.pasteall.org/52126/diff Seems hair is being properly updated when leaving edit mode, but before commit wouldn't mind having @LukasTonne's eyes on this..

blender-admin commented

2014-06-09 13:33:39 +02:00

This issue was referenced by 0ae8ce3ab1

This issue was referenced by 0ae8ce3ab1d8295266c8cda60f3446249b4416ab

Sergey Sharybin commented

2014-06-09 13:34:16 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2014-06-09 13:34:16 +02:00

Sergey Sharybin commented

2014-06-09 13:34:16 +02:00

Closed by commit 0ae8ce3ab1.

Closed by commit 0ae8ce3ab1.

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invisible hair particles slowing down mesh edits #40057