ODE collisions

How to make groups of solids to create collisions? I have to use joints?

http://nemesis13.de/tmp/blender4col.png

either do the solids by code as described here, use chicken’s tags for it or write your own, interactive solids editor. Joints are rather meant for animations and have not much to do with collision detection or even collision solids.

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btw, nice model you have there
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I want to make two(or more) solids act just like one, without joints.
Is there a simple way using ODE?

I did it with JOINTS.