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OpenGL ES 2 for Android by Kevin Brothaler

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Appendix 1The Matrix Math Behind the Projections

There are two main types of projections in OpenGL: orthographic and perspective. Both projections are used for transforming coordinates from a virtual world space into normalized device coordinates ranging from -1 to 1 on each axis. The projection defines what will be visible and how big it will appear.

Before we continue, you might want to give Linear Algebra 101, another read.

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