Locomotive BASIC - 3D Surfaces by Hung Tan Ngo

[ComSoft6128]

Type-in from the November 1988 issue of CPC Computing.
The program is Listed in the video.

Best viewed on a large screen at 720p (Dailymotion player setting)


https://www.dailymotion.com/video/x8loba6

From the magazine (courtesy of CPCRulez):
"OVER the past couple of years several routines have appeared which produce curving 3D surfaces. These have all worked on weird and wonderful mathematical calculations which leave little room for you to generate your own patterns - until now, that is.

The screen is divided into four segments on which two contour lines are drawn - one in the bottom left corner, and the other in the top right. They are controlled by the Q.W.E.R and T keys, which make the line travel up, down and horizontally.

When the bottom left line is complete you automatically move to the top right. After both have been drawn, you'll be given the option of joining them together to produce the surface. First you can link them from north to south, then east to west. Entering Y or N will either select this option or pass on to the next. If N is entered for both, you'll be given the chance to produce another pattern."