Newby question - Edges - edges somehow not connect


When I add a subdivision modifier on a model, some strange artifacts appear:

It looks like the lines are somehow nog connected. Does anyone know a way to solve this?

Thankd in advance,


Most likely there are faces inside the object going along those diagonal edges. In edit mode switch to x-ray view, select those faces and delete them, then select all the vertices on those diagonal edges and do a merge by distance (with low distance).

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Thanks Stan!

It solved the problem.