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relation of length of projection

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hello, i need to get the relation of a projection on the groundplane depending on the angle of projection so if the viewing angle is 90° (straight from top) the relation is 1:1 if it is from 45° it is 1:sqrt(2) if it is from 0° it is obviously 1:infinity can anybody hook me up with a formula for an arbitrary angle? looks like some sine or tangens, but i just cant figure it out! thanks!

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