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The only thing left is the camera definition, so that POV-Ray can calculate the image correctly:
camera { orthographic location -z*2 look_at 0 }
Why "2"? As the default direction vector is <0,0,1> and the default up
vector is <0,1,0> and we want the up direction to cover 2 units, we have to move the camera two
units away.
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