Particle update bug #41378

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Alexey · 2014-08-09T21:05:36+02:00

Alexey commented

2014-08-09 21:05:36 +02:00

{F102194}System Information
windows7 64
ASUS ATI Radeon HD6870

Blender Version
Broken: (all versions,2.71(9337574);2.71(81c3fc9);2.71.3(ee8dafe);2.71.3(3df4540)and all earlier)
Worked: (none)

Create UVmap with image,Create particle system(hair) use this image for particle and switch on lenght or(and) density.
go to tex paint mode, try to paint anything(lenght and density don't updated)

Type and size of the image - is not important
Shading mode - is not important.(this bug take place in bound box and wire mode too,we can not see texture, but we can see hair) this bug active in all shading modes.
Cycles or BI - is not important.
Settings of hair - is not important (we can use a path or object, for example)

Exact steps for others to reproduce the error
1)Open file and try to paint anything
2)Change any settings of this tex or particle system, press F12, go to other mode(edit,object,vertex or weight paint) to update lenght and density 1 time.(if we change shading mode - don't update)

P.S.If we use vertex group(not texture), go to weight paint, try to paint anything on this group - working properly.
If we use emitter particle system, switch animation(Alt A), and try to paint - blender crush
To activate this bug we must paint continious, while blender don't crush.

{[F102194](https://archive.blender.org/developer/F102194/Particle_update_bug.blend)}**System Information** windows7 64 ASUS ATI Radeon HD6870 **Blender Version** Broken: (all versions,2.71(9337574);2.71(81c3fc9);2.71.3(ee8dafe);2.71.3(3df4540)and all earlier) Worked: (none) Create UVmap with image,Create particle system(hair) use this image for particle and switch on lenght or(and) density. go to tex paint mode, try to paint anything(lenght and density don't updated) Type and size of the image - is not important Shading mode - is not important.(this bug take place in bound box and wire mode too,we can not see texture, but we can see hair) this bug active in all shading modes. Cycles or BI - is not important. Settings of hair - is not important (we can use a path or object, for example) **Exact steps for others to reproduce the error** 1)Open file and try to paint anything 2)Change any settings of this tex or particle system, press F12, go to other mode(edit,object,vertex or weight paint) to update lenght and density 1 time.(if we change shading mode - don't update) P.S.If we use vertex group(not texture), go to weight paint, try to paint anything on this group - working properly. If we use emitter particle system, switch animation(Alt A), and try to paint - blender crush To activate this bug we must paint continious, while blender don't crush.

Alexey commented

2014-08-09 21:05:36 +02:00

Changed status to: 'Open'

Alexey self-assigned this 2014-08-09 21:05:36 +02:00

Alexey commented

2014-08-09 21:05:36 +02:00

Added subscriber: @Inwader77

Alexey was unassigned by Bastien Montagne

2014-08-10 12:01:36 +02:00

Alexey commented

2014-08-10 21:49:37 +02:00

I was not grab this. I find this bug in blender.
I was look to other reports and don't find any similar

I was not grab this. I find this bug in blender. I was look to other reports and don't find any similar

Lukas Tönne commented

2014-08-11 12:39:00 +02:00

Changed status from 'Open' to: 'Archived'

Lukas Tönne closed this issue

2014-08-11 12:39:00 +02:00

Lukas Tönne self-assigned this 2014-08-11 12:39:00 +02:00

Lukas Tönne commented

2014-08-11 12:39:00 +02:00

This is a combined limitation of particles and the dependency graph (and maybe the paint system).

Particles only get distributed initially once. They are not continually repositioned based on textures, this only happens when substantial changes occur, like modifying the emitter (tab-tab to edit mode works) or changing the amount of particles.
The dependency graph does not support images at all. Any change to image data (painting) that could require updates somewhere else has to trigger them explicitly. Doing this for particle distribution would add lots of easily breakable code and probably be terribly inefficient, slowing down drawing.

This is a combined limitation of particles and the dependency graph (and maybe the paint system). - Particles only get distributed initially once. They are not continually repositioned based on textures, this only happens when substantial changes occur, like modifying the emitter (tab-tab to edit mode works) or changing the amount of particles. - The dependency graph does not support images at all. Any change to image data (painting) that could require updates somewhere else has to trigger them explicitly. Doing this for particle distribution would add lots of easily breakable code and probably be terribly inefficient, slowing down drawing.

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Particle update bug #41378