Here's a cross-section (along the x==0 plane) of a simple 3D
projection setup. The camera's aperture is centered at the origin,
facing in the +z direction. It's looking at an object at coordinates
(x,y,z), where x is zero and z is positive. The image is focused onto a
film plane at z==-1, one unit away from the origin, where the image
sits at coordinate Y_{w} (Y in the film window).

The question is, what's the equation for Y_{w} in terms of y and z? Please write the mathematical equation on a sheet of paper. Due in class on Tuesday, September 5th.

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