Keyframing off Animated property of a rigid body causing it not to be animated at all #39512

New Issue

Garrett · 2014-03-30T07:58:45+02:00

Garrett commented

2014-03-30 07:58:45 +02:00

System Information
OS: Ubuntu 13.10
Linux kernel: 3.11.0-18-generic

Blender Version
Broken: blender-2.70-b64bdb2-linux-glibc211-x86_64

Short description of error

In this .blend file, keyframing off the Animated property of a rigid body (found in Properties window -> Physics context -> Rigid Body panel), is causing object to reset to original position and not undergo any physics simulation.

Exact steps for others to reproduce the error
I was unable to reproduce the error from scratch. But if you open the .blend file below and scrub through the first 10 frames you will see that at frame 6, when Animated is disabled, it returns to original position.

File: bug_with_rigidBody.blend

**System Information** OS: Ubuntu 13.10 Linux kernel: 3.11.0-18-generic **Blender Version** Broken: blender-2.70-b64bdb2-linux-glibc211-x86_64 **Short description of error** In this .blend file, keyframing off the Animated property of a rigid body (found in Properties window -> Physics context -> Rigid Body panel), is causing object to reset to original position and not undergo any physics simulation. **Exact steps for others to reproduce the error** I was unable to reproduce the error from scratch. But if you open the .blend file below and scrub through the first 10 frames you will see that at frame 6, when Animated is disabled, it returns to original position. File: [bug_with_rigidBody.blend](https://archive.blender.org/developer/F83443/bug_with_rigidBody.blend)

Garrett commented

2014-03-30 07:58:45 +02:00

Changed status to: 'Open'

Garrett commented

2014-03-30 07:58:45 +02:00

Added subscriber: @Garrett-8

Sergej Reich was assigned by Bastien Montagne

2014-03-30 18:22:36 +02:00

Bastien Montagne commented

2014-03-30 18:22:36 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2014-03-30 18:22:36 +02:00

Sergej, that one is for you. :)

Sergej Reich commented

2014-03-30 18:43:22 +02:00

@Garrett-8:
It seems thst your rigid body world doesn't have a group assigned.
Try selecting "RigidBodyWorld" as the simulation group and things should work.

@Garrett-8: It seems thst your rigid body world doesn't have a group assigned. Try selecting "RigidBodyWorld" as the simulation group and things should work.

Garrett commented

2014-03-31 08:50:14 +02:00

Thanks! That solves my problem, although it still seems like surprising behaviour, but perhaps it's because I don't understand Rigid Body Worlds well enough.

Here's 2 unexpected behaviours in my opinion:

(1) Even when there is no Rigid Body World group set, the objects set to Rigid Body Physics have strange behavior. They do not follow their F-curves as in the example file I attached. Specifically, unless the Animated property is enabled, they just remain motionless. But if they're not part of Rigid Body World, then shouldn't they follow their F-curves?

(2) When you first set a rigid body object, a Rigid Body World is automatically created and it is automatically sets the Rigid Body World Group in the Scene context of Properties window. So the user never has to do this normally. Then if the user, hits Remove Rigid Body World (say by mistake), but then immediately hits Add Rigid Body World. This time, no group is given, so many users will not think that they need to manually set the group, since they may have never done so before. Perhaps a group should get automatically assigned like it does the first time Rigid Body World gets created.

Thanks! That solves my problem, although it still seems like surprising behaviour, but perhaps it's because I don't understand Rigid Body Worlds well enough. Here's 2 unexpected behaviours in my opinion: (1) Even when there is no Rigid Body World group set, the objects set to Rigid Body Physics have strange behavior. They do not follow their F-curves as in the example file I attached. Specifically, unless the Animated property is enabled, they just remain motionless. But if they're not part of Rigid Body World, then shouldn't they follow their F-curves? (2) When you first set a rigid body object, a Rigid Body World is automatically created and it is automatically sets the Rigid Body World Group in the Scene context of Properties window. So the user never has to do this normally. Then if the user, hits Remove Rigid Body World (say by mistake), but then immediately hits Add Rigid Body World. This time, no group is given, so many users will not think that they need to manually set the group, since they may have never done so before. Perhaps a group should get automatically assigned like it does the first time Rigid Body World gets created.

Sergej Reich commented

2014-03-31 16:16:59 +02:00

@Garrett-8:
I agree, I'm not a fan of the use of groups here either. But it was decided to use them here and it's hard to change it now.

@Garrett-8: I agree, I'm not a fan of the use of groups here either. But it was decided to use them here and it's hard to change it now.

Sergej Reich commented

2014-03-31 16:17:18 +02:00

Changed status from 'Open' to: 'Archived'

Sergej Reich closed this issue

2014-03-31 16:17:18 +02:00

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Keyframing off Animated property of a rigid body causing it not to be animated at all #39512