Formulas for 3d objects?

Question

JavaScript

I decided to render a 3D object on canvas. Are there any formulas for a simple 3D object. And which way to dig?

Answer 1

here's a 3d object x^2+y^2+z^2=1(or R^2)

Answer 2

Usually a 3D object is a network of triangles (mesh). For example, a cube has 6 faces, each face is 2 triangles. An even (smooth) cylinder or sphere will not work.