Wrong? dependency cycles detected when using a parented object as a boid rule object (object stutters then) #69407
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Reference: blender/blender#69407
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System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 26.20.100.6911
Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash:
f6cb5f5449
Worked: (optional)
The Empty fails to follow the object even that it is parented to it.
(empty is the leader of boids particles)
for comparison i have attached blender 2.79 blend file, and 2.80 file.
see video attached.
followEmpty280.blend
followEmpty279.blend
followEmptyBUG.flv
Added subscriber: @EricBu
Added subscribers: @Sergey, @lichtwerk
Can confirm.
Empty wont stutter without the Boid Rule.
We are getting a dependency cycle detected (but is is not neccessary afaict)
This one:
OBEmpty/Transform Component/TRANSFORM_FINAL() via 'Boid Rule'
seems wrong I think [it is not the empty transform being dependent on the Boid Rule?]Might be reading it wrong though, the relation in
DepsgraphRelationBuilder::build_particle_systems
add_relation(ruleob_key, psys_key, "Boid Rule");
looks good to me...Maybe @Sergey can shed some light on this?
Empty Parenting Glitchto Wrong? dependency cycles detected when using a parented object as a boid rule object (object stutters then)Actually means
OBCube/Particles Component/PARTICLE_SYSTEM_EVAL(ParticleSettings)
depends onOBEmpty/Transform Component/TRANSFORM_FINAL()
viaBoid Rule
.Line #(i) depends on line #(i + 1).
Real issue here is that rigid body needs to know object's geometry (which is known after modifier stack evaluation), and rigid body controlling final transform of the object. Now, the particles are part of modifier stack, and they depend on final transform of the object (due to parenting), and particles needs that object to fully evaluate.
This is another variation of #58044.
Closed as duplicate of #58044
Oki, thx for clearing that up