updated subs, added test for split_and_triangulate

3 jobs for develop in 5 minutes and 9 seconds (queued for 2 seconds)
Status Job ID Name Coverage
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passed clang-buster #98497
Linux buster

00:04:28

passed gcc-buster #98496
Linux buster

00:00:38

passed VS2017-x64 #98495
VS2017

00:01:38