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


| Doug Lindholm, Software Engineer          |  E-mail: lind@xxxxxxxx   |
| Research Applications Program             |   Phone: 303-497-8374    |
| National Center for Atmospheric Research  |                          |
| P.O. Box 3000                             |     There's no place     |
| Boulder, Colorado 80307-3000              |        like $HOME        |