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- 3DSHADE uses shading rather than a wire frame to plot z=f(x,y) in
- three dimensions. It requires a VGA graphics board and a VGA monitor.
- For the function supplied, try -1<=x<=1, -1<=y<=1, 70 divisions for x
- and y, and 30 degrees for tilt and rotation. To plot another function,
- change f(x,y) in the Microsoft C source, recompile, and run.