Sebastian H. wrote:

> problem/bug?

I dug a bit in the source code and found that a
change in fnintern.cpp fixes the problem.
In the f_rounded_box function there is an offset
of 1e-6 subtracted from the actual result.

return (... - 1e-6);

With an increased offset magnitude of 1e-3
the problem disappears and the isosurface looks correct.
Why this offset is there is beyond me but removing it
slows down the isosurface rendering a lot.

Sebastian

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