Linking a rotating object to a stationary object

I want to be able to create a single object that has two pieces - a stationary platform and a rotating ball above the platform. The platform and ball do not touch. WHen they are not linked, the ball rotates fine. When I link the ball to the platform, the ball doesn't rotate anymore or the platform attempts to rotate.

Is there a way to make these a single object with 2 prims and NOT have the ball effect the platform?

Fixit

Hmm... You could attempt to rotate the ball using child llSetPos(). However, this would be repeated stress on the server.

Is there any alternative?
What exactly is this for?


==Chris

the llSetTargetOmega does work quite well on child objects.

I can't remember the thread in which it was first posted, but there is a way to make one element of a linked set spin using llTargetOmega while another remains stationary.

Create your ball and platform, and make sure neither has a script in them. Link the two together, with the platform as the parent object. (That is, click on the ball first, then shift-click on the platform, then hit Ctrl-L.)

Then choose the "Select Individual" button on the Edit panel, and select the ball.

Go to the Contents pane and add the rotation script to the ball.

When you leave edit mode, the ball will rotate while the platform remains stationary, yet they remain linked; you can moved the two as a set.

(I have no idea if this behavior is by design or a bug.)

ok, so can (or has) some wizard come up with a way to do this on a multiple prim subset? i.e. a propeller? yes I could do it with a rotating texture now that they dont look like wobbly jello anymore but wouldn't real props be fun?
(well virtual real... erm... whatever)

Fixit, does the sphere have to truly rotate? You can have the texture rotate with no problems.