title: What are glm's vec1, vec2, vec3, and how/when should I use them?
body: <p>What is a <code>glm::vec2</code> what are its applications? I cannot find it in the glm reference. I can, however, find vec1. This leads me to think that <code>vec2</code> is for 2D, <code>vec3</code> is for 3D, etc., but I might be wrong.</p>