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I would like to create a compound rigid body. I had a look at this video, therein compound bodies were created by sampling primitive bodies together. The collision shape was set to a primitive like box or capsule. Than these bodies were all parented an so connected to each other and acted as a complex body.

However, the video used the blender-game mode, where the physics panel looked different to the one available in cycles-mode. In opposite to the video there is no option to set the collision bounds to compound.

But probably some images to explain:

That hook is the a hierarchy of 9 cylinders, each is a rigid body.

enter image description here

That is how it looks like in the outline:

enter image description here

This is the view of the physics panel:

enter image description here

Finally I connected each body with another, using »fixed« as constraint type, but all in all, the resulting body is not stiff and deforms, what is not what I want. I would like to have a completely stiff body. How can I gain that?

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  • $\begingroup$ Could you provide your .blend as a starting point? What you are looking for should be possible. $\endgroup$
    – user2859
    Commented Oct 30, 2014 at 20:07
  • $\begingroup$ You'll probably have to increase the number constraint solver iterations in Scene > rigid body world. That said, you might be better off using the Triangle mesh collision shape on a normal hook model. Also note that this feature was written as part of the 2013 Gsoc, but doesn't seem to be integrated yet.. $\endgroup$
    – gandalf3
    Commented Oct 30, 2014 at 20:18
  • $\begingroup$ You can also use Override Iterations and increase the number of iterations in the constraint panel for the constraints. $\endgroup$
    – user2859
    Commented Oct 30, 2014 at 21:28
  • $\begingroup$ give it a shot… $\endgroup$
    – philipp
    Commented Oct 31, 2014 at 9:22

2 Answers 2

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This is not possible in official blender at the moment, however this feature was written as part of the 2013 GSOC.
I haven't seen word of it since, so if someone knows why it hasn't been integrated with master yet, please tell me :P

The closest you can get is the Mesh collision shape:

enter image description here

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I don't know if this is an option for you, but you could Join the meshes (Ctrl-J) into a single mesh, eliminating the need for Fixed constraints.

If that is not an option, then increasing the number of iterations as suggested by gandalf3 and user2859 is probably the best way to work around the wiggle inherent in the Bullet physics engine.

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