[Addon] Rigid body / spring physics for bones

It’s almost feature complete, it’s well tested, and it’s very fast. But it could always use more testing (especially on real world projects).

It’s very safe and robust, but theoretically in extreme situations it could mess up your bone’s parenting, so make backups of your .blend files!

Also, don’t add any objects into the RigidBodyBones collection, they will be deleted.

Note that you need Blender 2.91.0 or higher, because of a severe bug in earlier versions of Blender.


I test it a little, when I run the example file and try to move root bone the entire chain of bone breaks. Does this happen into yours as well?

@cconst Thanks for trying it out. I don’t have any issues when moving the root bone either in Edit mode or Pose mode. What is your Blender version? And could you share a screenshot?

This is in 2.90.1

Also this log appears all the time in console, if is helpful to mention.

Thanks. As I explained, you MUST use 2.91.0, it will not work in 2.90.1 because of a severe bug in Blender.

OK, I tested it quite a bit. It was really easy to use. Some ideas about this:

  • I was able to enable and use the addon in 2.90 despite not working at all. This means at least perhaps other users might run on LTS or something else. At least there should be a strong ban on the registration process not to allow the addon get enabled at all. Provide a nice warning message.
  • One common use case I do is to select a dozen of bones and change the properties at the same time. Selecting-bone-changing-setting-selecting-bone-changing-setting is too much of a burden. Luckily I learnt somewhere deep in the forums that having multiple objects selected ALT+CLICK a property allows you change the same property for all the selected objects. I wonder if you know this trick - is perhaps one of the most hidden secrets of Blender. That way I could change some properties easily for multiple bones. However not easy to do on enabling Active bodies and such, it would lead to crashes. Something really good to consider if it can be solved somehow.
  • Another idea is that relative settings could be grouped together so they are changed at once. Such for example, all stiffness values and all damping go together. Sliding along the value boxes and then setting the value only once, really useful that way. Checkboxes can be slided all at once however only input boxes that are grouped together should be slided, and that way you can’t hit X Stiffness + Y Stiffness in one go. Just a usability note here, in terms of organization your design makes sense, but is only a matter of speed here.
    2020-10-08 23_03_24-Blender_ D__documents_graphics_armature.blend

Generally, it was really good.

boxer.blend.txt (812.1 KB)

It already specifies the minimum version: Link

According to the documentation, that should prevent it from being installed:


Yes, it is in the TODO list, but it is tricky because the add-on API does not give access to the bone:

I copied Blender’s UI for rigid body and rigid body constraints, but I agree that grouping them differently would be better, so maybe I should make it different from Blender’s UI.

@cconst I released version 1.1, it fixes all of the issues that you mentioned:

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Great. You can also jump to blenderartists.org to continue with further feedback in case you want to get more ideas about features and such. Or decide to split code into a lite free version and a commercial full-featured.

I released version 1.2:

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I released version 1.3:

I released version 1.4.1:

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I released version 1.5.0 (this is a big release):

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I released version 1.6.0:


I released version 1.6.1:

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Actually the wiggle bone has this feature. Add an update attribute to the prope and then loop over by.context.sepected_pose_bones. that should work

@RomboutVersluijs That was fixed a long time ago: Release Version 1.1 · Pauan/blender-rigid-body-bones · GitHub

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