Early mathermatical software

> On the other hand, if one has a picture onscreen and wishes to look
> at
>  it from a different angle, it may be preferable to select the view-
> point
>  using a pointer. For instance the 3D Grapher, [11], draws a picture
> of a
>  surface and the viewpoint may be changed by dragging an ?eye?
> around
>  in a window representing the horizontal plane of the domain, or it
> may be
>  raised or lowered by shifting an ?eye level? marker. As the eye is
>  dragged around, the surface is constantly being redrawn in rough
> detail,
>  until the chosen viewpoint is selected and the drawing is done with
> highlevel accuracy (figure 5).

? ["Graphical Packages for Mathematics Teaching & Learning", p.6][1]

Compatibility
Architecture: 68k

  [1]: https://homepages.warwick.ac.uk/staff/David.Tall/pdfs/dot1987e-graphic-packages.pdf

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