DirectManipulationRenderer

Hi,

I'm doing a sliding horizontal slice of 3D model data (akin to Vis5D). I
created a movable point (as in Test35) to move in the z-direction and
interpolate a 2D slice and display it as a contour. It works
surprisingly well with one minor problem: The point insists on being in
the middle of the xy-plane. I'd like it to be along the z-axis (i.e.
x=0, y=0). I tried a RealTuple for the point which allowed me to put it
where I wanted it but it has the side effect of letting me drag the
point all over when I only want to be able to drag it along z. Any
ideas?

Thanks,
Doug

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