Perspective and Orthographic Projection Matrix
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1. Perspective Projection Matrix
This chapter explains intuitively how to build a perspective projection matrix that is used to project 3D points onto the image plane of a perspective camera.

2. OpenGL Perspective Projection Matrix
The final truth about the OpenGL perspective projection matrix!

3. Orthographic Projection
Learn how to project points in world space onto the image plane of an orthographic camera using an orthographic projection matrix.