Rigid body costraint produces dependency cycle #79117

New Issue

epis · 2020-07-20T16:33:15+02:00

epis commented

2020-07-20 16:33:15 +02:00

System Information
Operating system: win 7 64 bits
Graphics card: radeon rx 580

Blender Version since 2.79b to 2.83.2

Short description of error
Rigid body costraint produces dependency cycle. Similar to #78952 but in this case constraint is used on empty object

Exact steps for others to reproduce the error
#79117.blend

Open file
Play animation

Hinge constraint does not work and there is dependency cycle warning in console

**System Information** Operating system: win 7 64 bits Graphics card: radeon rx 580 **Blender Version** since 2.79b to 2.83.2 **Short description of error** Rigid body costraint produces dependency cycle. Similar to #78952 but in this case constraint is used on empty object **Exact steps for others to reproduce the error** [#79117.blend](https://archive.blender.org/developer/F8714969/T79117.blend) - Open file - Play animation Hinge constraint does not work and there is dependency cycle warning in console

epis commented

2020-07-20 16:33:15 +02:00

Added subscriber: @epis29

blender-admin commented

2020-07-20 16:33:15 +02:00

#79292 was marked as duplicate of this issue

Richard Antalik commented

2020-07-21 06:49:00 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-21 06:49:00 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-07-21 06:49:00 +02:00

I don't understand what is being reported and this file is very complex. Can you demonstrate problem in very simple file?

epis commented

2020-07-21 11:29:39 +02:00

constraint rigid body.blend here's the scene in simplified version

[constraint rigid body.blend](https://archive.blender.org/developer/F8711247/constraint_rigid_body.blend) here's the scene in simplified version

Richard Antalik commented

2020-07-22 02:50:34 +02:00

For objects to not "break apart" you need to set angle limit on constraint. Is that the problem?

epis commented

2020-07-22 09:54:44 +02:00

I don't want the objects to break, but that the object on the right before launching the animation, once launched, that this one turns on the x-axis and not on the z-axis, look at the file I'm going to attach, and compare it to the one I made for you in a simple way, you'll see that I did the same thing and that it doesn't work at home.

on the file I've attached there now, you'll see that the pods rotate freely, unlike what I did simply by doing exactly the same thing.manege-TESTE_2.blend

I don't want the objects to break, but that the object on the right before launching the animation, once launched, that this one turns on the x-axis and not on the z-axis, look at the file I'm going to attach, and compare it to the one I made for you in a simple way, you'll see that I did the same thing and that it doesn't work at home. on the file I've attached there now, you'll see that the pods rotate freely, unlike what I did simply by doing exactly the same thing.[manege-TESTE_2.blend](https://archive.blender.org/developer/F8713334/manege-TESTE_2.blend)

Richard Antalik commented

2020-07-23 05:07:17 +02:00

I think there are 2 problems: you need to orient Z axis of empty with hinge constraint to be same as desired axis of rotation. In file constraint rigid body.blend Z axis is perpendicular to rotation axis. Then there seems to be bug where rigid body constraint will create dependency cycle. You can see dependency cycle reported in system console. This can prevent simulations working correctly. That is probably the main problem.

#78952

I think there are 2 problems: you need to orient Z axis of empty with hinge constraint to be same as desired axis of rotation. In file `constraint rigid body.blend` Z axis is perpendicular to rotation axis. Then there seems to be bug where rigid body constraint will create dependency cycle. You can see dependency cycle reported in system console. This can prevent simulations working correctly. That is probably the main problem. #78952

Richard Antalik changed title from ~~bug rigid body constraint type hinge~~ to Rigid body costraint produces dependency cycle

2020-07-23 05:13:59 +02:00

Richard Antalik commented

2020-07-23 05:13:59 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

epis commented

2020-07-23 10:21:19 +02:00

so, what can I do about it ? since I'll need the game blender, I'll stay on 2.79b since I can't find any tutorials in french for upbge, so if I could get a patch for 2.79b it would be cool.

all I do to be able to understand you and answer you is to use a translator...

so, what can I do about it ? since I'll need the game blender, I'll stay on 2.79b since I can't find any tutorials in french for upbge, so if I could get a patch for 2.79b it would be cool. all I do to be able to understand you and answer you is to use a translator...

Richard Antalik commented

2020-07-24 04:46:19 +02:00

@epis29 I am not sure what do you mean. This bug will have to be fixed, that will take some time.

Game engine is no longer developed and part of blender. UPBGE is not maintained by us either. 2.79 will not receive any patches

@epis29 I am not sure what do you mean. This bug will have to be fixed, that will take some time. Game engine is no longer developed and part of blender. UPBGE is not maintained by us either. 2.79 will not receive any patches

Richard Antalik commented

2020-07-28 14:50:35 +02:00

Added subscriber: @SVAFnemesis

blender-admin commented

2020-07-30 18:22:29 +02:00

This issue was referenced by 8dc2fbd7b6

This issue was referenced by 8dc2fbd7b666b6cf0477627249f1a2b6a4924e9e

Jacques Lucke commented

2020-07-30 18:26:26 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-07-30 18:26:26 +02:00

Jacques Lucke self-assigned this 2020-07-30 18:26:26 +02:00

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Rigid body costraint produces dependency cycle #79117