How do you manually draw a 3D cone in OpenGL immediate mode? The OpenGL utility library (GLU) provides a cone function, but there may be various reasons for preferring to not use it, including reduced dependencies and finer control over the cone.
This article explains one way to manually draw a cone. There are two sections, first a verbal and mathematical explication of the main function, and second a listing of relevant code snippets. Snippets are embedded Gists from Github, which means that you are welcome to make them more concise or pretty if you like. If you want to skip directly to the code, click here.