How QB matches my heat-exchanger design process

[Pete]

You could also take advantage of the massive power of SCREEN 0 and do the mechanical drawing relief of the pipes at one end...

PRINT "o    o     o"
PRINT "o    o     o" 
PRINT "o    o     o" 
PRINT "o    o     o"

There are pipe algorithms in OpenGL: https://www.songho.ca/opengl/gl_cylinder.html

General info: https://learnopengl.com/Model-Loading/Model

Now I have no experience with OpenGL, but a couple of forum users have put together some nice mapping examples in the past.

Pete