ELI5: Explain Like I'm 5

T-spline

A t-spline is a kind of special shape for 3D models that makes it easier to change and adjust the shape. It's like playing with modeling clay, but on a computer. Normally, when you make a 3D model on a computer, you have to use lots of straight lines and corners to make the shape. This makes it hard to make changes, because you have to move lots of little lines to get the shape right.

But with a t-spline, you use curved lines instead. These curves can bend and twist in all sorts of ways, which makes it easier to smoothly change the shape of the model without having to adjust lots of little lines.

Think of it like building with Lego blocks versus playing with a flexible toy like Play-Doh. With Lego blocks, you have to put the blocks together in a certain way and it's hard to make changes without taking apart part of the construction. But with Play-Doh, you can bend and twist it any way you want, making it much easier to change the shape.

T-splines also help make 3D models look more realistic by allowing for smooth curves and surfaces, rather than hard edges and flat planes.

In summary, t-splines are a way of making 3D models that use curved lines to make it easier to adjust and change the shape.