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@ -305,12 +305,14 @@ Now let's have a simple **3D model data** of a quad. Quad is basically just a sq
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*quadModel*:
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```
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v3________v2
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| _/ |
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| _/ |
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| _/ |
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|/_______|
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v0 v1
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```
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In a computer this is represented with two arrays: vertices and triangles. Our vertices here are (notices all Z coordinates are zero, i.e. it is a 3D model but it's flat):
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