Append Face issue with aligned vertices

Is this normal behavior?

I’m trying to close an open SubD with a face (append) by picking all the vertices (in this example 6 vertices) but the resulting Subd is kinked and not closed. However, if I move the middle vertices outward and redo the process, the resulting SubD is closed and correct.

SUBD-FACE.3dm (138.3 KB)

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@Gijs you replied in the other SubD thread so just tagging you here as well if you could have a look at this please.

@ftzuk thanks for reporting, that looks buggy to me.
RH-92146 SubD: append doesn’t weld

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I see what’s happening, 3dFace ignores consecutive aligned pick points so only the end ones are used to make an edge. After that it cannot connect the new edge to the original middle vertex because there is no new vertex there.

I should be able to fix it when 3dFace is in append mode and ngon mode, it shouldn’t ignore pick points on existing vertices even if they are aligned.

Meanwhile you can easily get the same result here by making multiple quads or triangles using the middle vertices as corners, then merging them in one face by deleting the shared edges.

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