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Ken,
Um, I guess I thought it *was* the simple way. I got my stuff from a course in geometric modelling, a graduate-level engineering class in the mathematics behind how computers generate real-time 3D scenes onto your monitor. The course started out assuming you were familiar with matrix algebra, vector and tensor calculus, and differential equations, and then got into the complicated stuff. Plan perspective was tossed out as a simple, intuitive way to picture what was going on when the computer was crunching bits.
As Allan says, you can paint any scene by painting through an imaginary frame, from life.
I suppose the next simplest way is to use a reference photo and accept whatever distortions are created by the camera lens.
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