Crash entering editmode on an object with particles and ridgidbody parented to another rigidbody #73255
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Reference: blender/blender#73255
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System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash:
f1aa4d18d4
Worked: (optional)
Short description of error
The hair particles are facing the opposite direction and blender crashes, trying to solve this.
Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
Donut2-1.blend
Donut2-1.blend1
Created a donut according to site https://www.youtube.com/watch?v=jNmnPXY9UQA
Steps:
Particle Properties
+
Hair (Not showing ?!?)
First frame -> Hair showing downwards!
Tab
Blender crashes repeatable.
Steps:
Particle Properties
+
Hair (Not showing ?!?)
First frame -> Hair showing downwards!
Tab
Blender crashes repeatable.
Added subscriber: @JWblender
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Needs User Info'
Please give us detailed (step by step instructions how to cause a crash). It's great, that you attached .blend file, but I have no idea what to do with it.
Added subscriber: @lichtwerk
Changed status from 'Needs User Info' to: 'Archived'
Both
Icing
andDonut
are Rigid Bodies, and... they are parented to each other.This is a no-go in 2.8 with rigid bodies (see #58044) and will result in a dependency cycle:
This is why the thing stops evaluating...
Not sure why the rigid bodies are there?
You could either
Icing
fromDonut
orand you should be fine...
Bonus: flip the normals on the
Icing
in editmode.Doesnt seem to be a bug here, closing... thx for the report anyways...
Changed status from 'Archived' to: 'Confirmed'
Ah wait, forgot about the crash :)
That should not happen in any case, checking... but I guess this could be the side-effect of #58044 [might be merged? -- but lets see if there is a quick way to get rid of the crash...]
Blender crashes while trying to create particlesto Crash entering editmode on an object with particles and ridgidbody parented to another rigidbodyAdded subscriber: @Sergey
@Sergey: how are we handling cases like these?
We have the reported dependency cycle (see above), so seems
mesh_eval_final
is not ready.BLI_assert(me->edit_mesh->mesh_eval_final != NULL);
Without the assert, blender will crash later in
DRW_mesh_batch_cache_create_requested
(accessingme->edit_mesh->mesh_eval_final->runtime
)Changed status from 'Confirmed' to: 'Resolved'
@lichtwerk, with dependency cycle object's evaluated state might not be ready during evaluation, but at a draw time everything is expected to be present.
For example, if there is a dependency cycle between A and B via their modifier stacks, the modifiers might not be evaluated "properly" (due to missing A's mesh_final and vice versa), but both A and B should have mesh_final at a draw time.
Changed status from 'Resolved' to: 'Confirmed'
Somehow managed to change status of the ask. Was unintended.
Added subscriber: @JacquesLucke
So what exactly do I have to do to reproduce this crash in latest master? The reproduction steps are not very clear to me.
Maybe this has been fixed by
820ca419e0
.