What is the different between Subdivision modifier and Right click - Subdivide?

Video detail: 2024-07-10 20-47-00.mp4

I tried to use Subdivision modifier on the door frame and then right click in edit mode → Subdivide, the results are different, can anyone explain this scenario to me?

Check the manual


The door frame contains many edges.
But the door is not.
This is a topology problem and requires an understanding of topology modeling.

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Simple said: they are different algorithms. You do not need to understand the math (but it may help ). But fro sure have a look a the different results:

Left Subdivision modifier; right Subdivide with Smoothness 1.0 :

In fact there are lot of other possiibilities:

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