okey, next few posts will be about opengl. What is it, how it works, basic commands, etc..

OpenGL (Open Graphics Language - Ogl) is multiplatform union of functions and procedures for making real time 3D graphics on computer monitor, which is drawn in 3 dimensions (3D), including 2D graphics in real time. It is popular because it is used in big number of games for drawing graphics, and its competition is Direct3D (also reffered as D3D) by Microsoft, which is one platform, made only for Microsoft Windows. OpenGL is used in: 3D applications, and scientific applications for visualization. It is consisted with about 250 commands that enables drawing of complicated 3D scenes.