Hi to the crowd,

I wonder a little bit about the threshold values of isosurfaces. From the docs:

The surface appears where the function value equals the threshold value.

I observe that the surface appears at values smaller than the threshold value if
it is not reached. To be more precise: I have a function yielding only 0 or 1
depending on the membership to a given set. 0 indicates membership, 1 not (1
minus the characteristic function of the set). Threshold values of 0.1, 0.2 and
0.9 all give the desired object. To my surprise 1.0 too, 1.1 gives the expected
unit sphere. Threshold 0.0 yields nothing.

May be a numeric issue at threshold 0.0 and 1.0.

What do I miss here?

Since I get my object I have no real problem, more a problem with understanding
the isosurface concepts.

Best regards,
Michael

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