precondition violation when using P.join_vertex(h)

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precondition violation when using P.join_vertex(h)

Shi Yan
hello guys,

i need to do edge collapsing on my triangulated mesh. but when i use
join_vertex, i got precondition violation error. i then realized that
i need to make sure size of both facets incident to h is at least
four.

so how should i do edge collapsing on triangles?

thank you so much.
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