Materials in 3D can be a complicated topic, but Polygonjs aims to make this very intuitive.
I still have to write a full page on the subject, but in the mean time, here is a short video giving you an idea on how to create a glsl shader without having to write a single line of code.
Here is another one to achieve fun and psychedelic car effect!
Example: Freezing effect
This car scene will soon be available, but in the mean time you can look at the that gives the video below: