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Maniphest T44090

274rc2 Particlesystem Hair - with Density Texture
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Description

System Information
win7 64 bit

Blender Version
273a & 274rc2

Short description of error
if a particle texture is in use - mapped to density - and you play with the particle or texture settings, the particles go crazy.
Often they disapear completly

Exact steps for others to reproduce the error
open the blend and decrease emission number (amount) by 1
or try any other setting in particles or in the density texture

Based on a (as simple as possible) attached .blend file with minimum amount of steps

particle_texture_density_bug.blend2 MBDownload

Revisions and Commits

rB Blender
D1213rBdced56f02a42 Fix T44185, Fix T44090: hair texture density working unreliable.

Related Objects

Event Timeline

Tobias Lijsen (blenderhilfe) created this task.Mar 22 2015, 8:33 PM
Tobias Lijsen (blenderhilfe) raised the priority of this task from to 90.
Tobias Lijsen (blenderhilfe) updated the task description. (Show Details)
Tobias Lijsen (blenderhilfe) added a project: BF Blender.
Tobias Lijsen (blenderhilfe) edited a custom field.
Tobias Lijsen (blenderhilfe) added a subscriber: Tobias Lijsen (blenderhilfe).
Sergey Sharybin (sergey) assigned this task to Lukas Tönne (lukastoenne).Mar 24 2015, 9:01 AM
Sergey Sharybin (sergey) added subscribers: Lukas Tönne (lukastoenne), Sergey Sharybin (sergey).

@Lukas Tönne (lukastoenne), is it the same as T43694 ? And what is the resolution here?

Sergey Sharybin (sergey) lowered the priority of this task from 90 to Normal.Mar 24 2015, 9:01 AM
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).May 3 2015, 12:50 PM

Sergey, I think the problem started in rB78c491e62a5.

Previously it would mark the particles with PARS_UNEXIST based on the texture and then remove any particles with that flag. Now it removes particles first and only then sets that flag based on the texture, which is too late. On the next refresh it then suddenly detects some particles to remove from the array, which causes some unpredictable behavior with the particle array index based psys_frand.

Brecht Van Lommel (brecht) added a comment.May 3 2015, 4:00 PM

Actually this looks like the same bug as T44185, for which there is a fix in D1213.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Resolved.May 3 2015, 4:23 PM
Brecht Van Lommel (brecht) added a commit: rBdced56f02a42: Fix T44185, Fix T44090: hair texture density working unreliable..

Closed by commit rBdced56f02a42.