Merging "At Center" or "Collapse"?

What’s the difference? And which one do I pick? They seem to have the same effect in this lecture.

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Good question. Had to experiment, and check the online Blender manual.

At Centre

It will place the remaining vertex at the centre of the selection. Available in all select modes.

Collapse

Every island of selected vertices (connected by selected edges) will merge on its own median centre, leaving one vertex per island.

Ah Ha!

If you had two cubes in the same object, and selected a top set of 4 verts on each cube, At centre would join them all together at one mid point.

If you use collapse, each cube merges it’s selected verts separately.

Pairs of cubes.
Back ones all top verts selected, M ‘At Centre’.
Front ones all top verts selected, M ‘Collapse’.

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