OpenGL (Open Graphics Library) is a specification defining a cross-language cross-platform API for writing applications that produce 3D computer graphics (and 2D computer graphics as well). The interface consists of over 250 different function calls which can be used to draw complex three-dimensional scenes from simple primitives. It is very popular in the video games industry where it competes with Direct3D (on Microsoft Windows) (see Direct3D vs. OpenGL). OpenGL is widely used in CAD, virtual reality, scientific visualisation, information visualisation and video game development.

OpenGL is one of the number one methods used to create WallHacks by modifying the OpenGL32.dll to render walls semi-transparent.


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