"SamuelT" <STB### [at] aolcom> wrote in message news:393EF506.59DE1364@aol.com...
| I got the same problem when I tried intersecting an isosurface and
transparent box
| with ior. The isosurface was using noise3d, by the way. I haven't tried it
without
| the noise3d yet.

I think that has to be it then, 'noise3d()'.  Since you insist :-) I just now
tried with the built-in sphere function and no border line is exists.
Something has to be wrong with noise3d then or the equations being used.  Hope
I can find out one way or another eventually.

Bob

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