# Distance and Shape

Sketching with Math and Quasi Physics

## Distance function

A shape can be defined by a function that takes the coordinate of a point and returns the distance to the closest boudary of the shape. This function is called distance function and used as a modeling technique in computer graphics.

### Learn more

Ray Marching and Signed Distance Functions by Jamie Wong

The book of shaders - Shaping function by Patricio Gonzalez Vivo & Jen Lowe

Distance functions by Inigo Quilez

## Circle

The size of dots indicate the distance from the boundary of the shape (the smaller the closer). White dots are inside the shape. Black dots are outside.