[racket] plot: HOLY MOLEY!

So, I've been plotting the frequency response of chebyshev filters, and I decided to try out the 3d plotting of the new plot:

(define chebyshev-fun (poles&zeros->fun chebyshev-poles '()))
(plot3d (surface3d (lambda (x y)
                     (magnitude (chebyshev-fun
                                 (+ x (* i y))))))
        #:x-min -1.0
        #:x-max 1.0
        #:y-min -1.0
        #:y-max 1.0
        #:z-max 100.0)

=> 

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Which is just absolutely amazing. But then, just on a total whim, I used the mouse to... grab and turn it ?!??   JAW DROPS OPEN HERE.

That was quite a shock. A good one!

Color me sold.  I'm just wondering how soon I can show this off to my students.

John

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