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In my mind, this makes perfect sense, but I'm wondering if this really works. If I have an isometric cuboid, I can perfectly calculate it's shadow on the fly by using similar triangles and the Pythagorean theorem, correct? I would know the "height" of the light source and the "height" of the cuboid and that's really all I need, right? - Thank you

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If you mean you can project the cuboid's shadow onto a plane by simple math, then yes.
You'd need the distances of both the cuboid and the light to the plane as well as the distance between the cuboid and the light. With those values you should be able to calculate the projection on the plane.

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Isometric engines with shadows look pretty cool, ive seen them before.

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Lord_Evil, by the distances from the cuboid and the light to the plane, you mean what I am referring to as height, correct?

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