mrdoob/three.js — pull request #3477 by insominx (2013-05-13 22:09:32+00:00)
Title: Added terrain raycast example.

This example shows one way to visualize the operation and also
illustrates the need to triangulate any quad based geometry whose quads
are not planar. For consistency, it is using the same terrain from the other examples.

It also shows how to procedurally create a checker texture.