This HyperCard stack draws isometric projections of three-dimensional
curves and surfaces (wire-frame). Curves are described with 3
equations in one parameter, and surfaces with 3 equations in two
parameters. The curves and surfaces can be exported to Rotater files,
of which the files above are an example. There are various export
options, like choosing between the 7 available colours, exporting dots
or lines and varying the colour according to the z-coordinate of each
point. The number of digits after the decimal point can be chosen
between 0 and 20, but in most cases 4 digits are amply sufficient.
