1981 MTU ad for PET graphics

[GK2001]

Hmm, I reckon that link looks rather similar to the one AndyG posted!

The math is pretty straightforward, but the real labor in realising a Spirograph emulator is in measuring the multiple hole-center radius's for each of the multiple wheels along with the diameters of the wheels themselves. Then there are the multiple start positions for each wheel too. All up it will take a fairly decent DATA array in BASIC.

 

[ab3ap]

Hmm, I reckon that link looks rather similar to the one AndyG posted!

I've been caught showing up to class without doing the assigned reading - thanks, AndyG, for the useful links that I somehow missed!

 

[GK2001]

It is raining and I was bored. I figured out a program that draws a wire-frame sphere in an orthographic projection to any angle (0 - 360 degrees) of rotation on the x and y axes that you tell it to. The program only computes the coordinates at which the lines intersect, so it executes fairly quickly. Execution time is mostly determined by the number of segments drawn and the sphere as photographed took 13 minutes to plot.

This is a true projection of an object defined in three-dimensional space by three Cartesian coordinates. I'm trying to figure out how to slice it to implement a hidden-line algorithm with the much more time consuming gazillions of points plotting method.

 

[davepl1968]

Old thread, but I thought I'd show off my KIM-1 w/ MTU-K-1008 graphics board running this plot... slightly sped up

 

[Hugo Holden]

Reminds me of Weird Science for some reason.

View attachment 1241061

I managed to get some interesting graphics on my 5155 computer with a graphics package, I will try to find and post it.