Thank you all for your help with this issue.

After reviewing traces and doing some work with them, I think I will stick
with my original solution.  The main reason is that if I decide to make the
tire out of a mesh instead of a CSG, the method I originaly put together
will work.  Also, I can more easily deform the mesh to make it look like an
air filled rubber tire.

Mike wrote:
>Goal: To have a CSG shaped tire follow the shape of an isosurface ground
>during an animation.
>
>Method:
>I wrote a macro that will take the object identifier and a resolution
>attribute (float value).  I then create an array of points that fill the
>max and min extents of the object, spacing them at the value given by
>resolution.  I then iterate through the list and remove all the points
>outside the actual object (using the inside function).
>I then place the object (and the point array) below the lowest level of the
>ground (i.e. if the grounds lowest point is -.5, I place the wheel at -.6.
>I then test each point in the array to determine how far I need to
>translate the wheel up to get all the points outside the ground.  I then
>translate all the points and the wheel that amount.
>I repeat the above process for each frame of the animation.
>
>Problem:
>The method is not entirely accurate.
>The method is not very fast.
>
>Question:
>Is there a better way to do this?
>

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