3D point from two angles and a distance?

I want to be able to calculate the coordinates of a 3D point, based on its distance from the origin, and two angles:...

Liquid level animation( Battery Doctor )?

I want to know how to make this kind of animation in android ( The same in Battery Doctor app ). I found a way to...

Rendering 2D sprites in a 3D world??

How do I render 2D sprites in OpenGL given that I have a png of the sprite? See images as an example of the effect ...

What does `precision mediump float` mean??

In the learningwebgl tutorial1 I've found an interesting line in the fragment shader. precision mediump float; I'...