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as far as i know n-gons cant be subdivide by adding edge loop but i discover that some times it can be :

enter image description here

enter image description here

i tried to make loop cut again but it doesn't done , i know it should good thing to cut Ngons sometimes but that make me wondering /: ?!

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Going around the cube this way:

enter image description here

You have a continuous face loop, regardless of its ngon status, because the connecting faces just have one edge between them.

enter image description here

If we "unwrapped" the shape in the direction you're cutting it would look like this (I've only shown three sides)

enter image description here

If we went the other direction it would look something like this, with a couple extra verts:

enter image description here

And this is no longer a continuous face loop. The loop cut operation will stop when it can no longer find a definite way to travel down the next face.

Looking at all the edges this cut could decide to go to:

enter image description here

I would say as human onlookers it's pretty clear where it should go, but programmatically (for the general case) it's probably a hard problem to solve. The operation just stops when it can't find the next face in the loop.

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  • $\begingroup$ I opened Blender just to prove you wrong, and then was surprised it actually works! :) Cool. $\endgroup$ Commented Feb 20, 2021 at 8:41
  • $\begingroup$ I dont think its because the loop cut can not continue, as such. But basically because if you subdivide the surface it does not form a strictly defined loop. Which is what 3d artist are generally looking for with a loop split. So while you could relatively easily make a inference un these cases, its just that its counter to what the modelers are generally doing. So its mainly because its preferable to terminate like this because it represents the path of least surprises few operations down the line. $\endgroup$
    – joojaa
    Commented Apr 21, 2021 at 13:29

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