@unknownuser said:

@unknownuser said:

what I'm doing wrong!

Have you pressed and holdCTRL when you click on the Join Connector and the group ?

NO! I watched a video and did not pick up on that. I just tried it and get the proper simulation.

Thanks for the tip.

Mike

@danyhkim said:

I made a video of my experiments, and posted to YouTube.

http://www.youtube.com/watch?v=74ji-NXsdDI
[flash=425,344:18h7jbs0]http://www.youtube.com/v/74ji-NXsdDI[/flash:18h7jbs0]

For a simple articulated joint between two blocks, where the blocks must interact with each other and with other objects, and where the entire articulation is able to move about, the joint should be added to a third grouped object during an "edit group" action, making it into a moveable object itself, then joint-connected to the "arms" of the articulation.

Yeah, watch the video. My description confuses even me, and I wrote it!

I watched the video (well done, BTW) but still cannot get the desired interaction. All I'm trying to replicate is the hinge and box which I create as you did. I use the joint connector, first selecting the hinge and then the box. When I run the simulation,the box just drops downward. I simply cannot figure out what I'm doing wrong!

I'm using SketchyPhysics 3.2 and Sketchup 8, free version on a Windows XP system.

Mike