distance surfaces has gaps in mesh

cross-ref EP1041

Problem was suspected to be in the iso-surface algorithms, but actually arises from the cell pre-filtering.

mentioned in commit 7b2354079c5c20beeac73d8956fcb2ce372390a3

mentioned in commit fc3d515be842a2c88da01958b640ad5033b13ffd

@Prashant

mentioned in commit f603cb0570c189f8ec2797f80635a98805cdb917

mentioned in commit 9abdd837bd6aef2acc259c00a5c8e9623709ab4a

mentioned in commit ae8499f2a3caffcaad66fc17d05af1c22092a778

mentioned in commit 4fa63d9bc6c6ec7c74b1c101e5454ce02a1e1de0

mentioned in commit 2a9c6c97

closed