ELI5: Explain Like I'm 5

Doo-Sabin subdivision surface

Hello there! Do you know how when you draw pictures on paper, you can make them look more 3D by shading and coloring them in? Well, imagine we're doing the same thing for a 3D computer model. But instead of shading and coloring, we're going to add more little faces to make it look smoother and rounder.

Now, when we add more faces to a 3D model, we need to decide where they go. A doo-sabin subdivision surface is a special rule that tells us where to put the new faces so our model looks nice and even.

Here's how it works: first, we take each side or edge of the model and divide it into two. So now we have more little lines that make up our model.

Next, we look at each corner where those lines meet. We imagine a little tent being built on that corner, with each line as one side of the tent. Now we can put a new point in the middle of the tent, and connect it to all the points that make up the tent's sides.

Doing this for every corner in our model will create a bunch of new faces that make the surface look smoother and more round. It's like we're adding extra coloring and shading to our model, but drawing the extra details in a very special way.

So there you have it, a doo-sabin subdivision surface is a way to make a 3D model smoother and rounder by adding more faces in a specific pattern. Now, if you ever need to impress your friends with your 3D modeling skills, you know how to do it!