Lummox JR wrote in message <38D### [at] aol com>...
>Oddly they pass through only the isosurface cap, but not the cylindrical
>portion on the bottom. The cylinder primitive doesn't have this problem.
>If I extend the isosurface to the whole bomb (except the fins), the
>problem shows up for the whole bomb.
It sounds like it may be a problem with the ray-isosurface intersection
code. Since the isosurface is a *approximation* of the actual surface, the
intersection code may be getting confused and thinking that the two surfaces
are coincident. Try increasing the accuracy of the isosurfaces as high as
you can.
Mark
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