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On XSIBASE, a user wanted to know how to achieve this:
[I]"For example, when the chain is drawn in front-view, root at 0,0,0, start second bone at 2,2,0, effector at 0,4,0, I would like to have the first bone NOT come off the Z-equals-Zero-plane, even when the effector is yanked from this plane.[/I]
[I]On Rotation-Order The help-file states, in Preventing Gimbal Lock: If an object is rotating on two axes, change the order of axes to correspond with the first and last axes; that is, if the object is rotating around the X and Y axes, change the order of axes to XZY.[/I]
[I]This brought me to the conclusion that the first bone needs Z-rotation first and then X-rotation only, so I’ve set the first bones’ rotation order to ZYX and limited the Y-axis to 0 degrees of freedom. To no avail : the first bone happily rotates about it’s Y-axis.[/I]
[I]Limiting all rotation on Z and Y gives me the desired effect on the X-axis, any liberty on the Z-axis brings it out of it’s desired arc."[/I]
So I tried and came up with this solution (attached zipped scene).
Load and hit play.
I prefer posting here cause you can attach simple scenes :)
Ciao.
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