iso-surface (topo) can generate zero-size faces

Flagged in EP1578 as being related to distance-surface sampling, but it actually related to small topological cuts.

assigned to @mark

Example topological cuts (plane near corners). On output, the very small faces essentially collapse to zero due to the write precision.

Proposed resolution is to add optional point snapping (eg 1% of iso-value) to eliminate small cuts.

mentioned in commit 61dc4839

mentioned in merge request !488 (merged)

mentioned in commit 469be6e9

mentioned in commit 4ff010d0

mentioned in commit 680c1dcf

closed