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So I'm trying to figure out how to replicate this (picture attached). It seems pretty simple in concept, but I can't figure out how they did it. I have assumed it is based on some sort on extrusion from edge to tri, but I haven't figured out how that works. Does anyone have a clue?

tail mesh constructed from tris obj mode

tail mesh constructed from tris edit mode

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  • $\begingroup$ It would be a better question if you created a simplified (minified) example, e.g. where you want to create/extrude (whatever you want to do) 3 triangles or so. $\endgroup$ May 26, 2023 at 12:10

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For 1 edge

Since you're asking about a single triangle… Select the edge, Create a custom orientation from it:

now E to extrude, ⬆ ShiftY to lock $y$ axis (defined a moment ago by using the edge), M to merge and either A or B:

For multiple edges

You could use Goemetry Nodes to find a perpendicular vector, then maybe rotate randomly and finally merge by distance:

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