Interesting.
Is there a way to say, determine the coordinates of the corners of the view?
I realize this would be dependent upon the distance...

I'm thinking:
draw a line from the camera to the look_at point C=<1,1,-1> and L_A=<0,0,0>
draw a plane perpendicular to that vector   plane {C-L_A, 0}

.... then there must be a way to draw line extending from the camera to the
corners, but I'm not familiar enough with the workings of the camera(s) to see
how to do that.
I guess this has something to do with direction and/or angle

I've seen that you can actually texture the _camera_?!
That would be useful to do with a grid - faster rendering than with a plane?
Can the camera be textured with a "frosted" effect to simulate an old
ground-glass view-camera?

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