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Question with Tutorial 10

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Ok I''m a newbie gl coder so bear with me and tell me if I missed something in the lesson. Ok I would like to know why it uses triangles to draw the scene and how it makes them look like squares. --Insert smart and witty signature here--

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It uses triangles because they are faster than quads. It just uses two triangles to make up a quad, instead of one quad. For example:

|---|        |---||  /|        |   || / |        |   ||/  |        |   ||---|   vs   |---|

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