from -pi/2 to pi/2 using cosine with frequency 1.  In 3D, I look at this
surface from above so I am looking down at a 'mountain'. The amplitude
of  this cosine has to be varied using the same image. Is it possible to
make a very large image and letting image_map cut only the part that it
requires, depending on the amplitude, to wrap this mountain. I don't
want the image to be stretched or compressed. Any suggestions?
Jan

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