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Hey Daniel,
when using the scalar filter for segmenting a part of a mesh created by the poisson reconstruction a gap between the two segmented areas shows up.
See the attached image. Filtering based on splitting or exporting both parts of the mesh creates the same gap.
Is this behaviour ment to be?

Cheers.
Arie

Indeed, when splitting a mesh based on the scalar field (or with the scissors tool, it works almost the same) the triangles which have at least one vertex outside of the range (or crossed by the boundary for the scissors tool) are removed. Which means that these triangle will be removed in all cases... (because some of the vertices are in the [a ; b] range, and some are in the [b; c] range).

We should handle the 'split' method slightly differently but I'm not sure that's easy.