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Excellent! A similar program, apparently from 3 years ago, did similar things, in Basic also, on the Amstrad CPC, a machine with the same processor, a little more RAM and more (27) colors or shades of green, depending on the screen it was hooked to.

* colored spheres (like you did)

* (one) checkerboard surface

* self-shadowing (like you did)

* cast shadows (like you did)

* partial or total specular reflection!

See https://www.cpc-power.com/index.php?page=detail&num=19283

The webpage displays the color (left) and green (right) versions on hovering your pointer over the ribbon (above). Image 1 and 2 are okay in both cases, image 3 is clearly tuned for color screen, image 4 for green screen.

Or direct links to the relevant variants:

https://www.cpc-power.com/extra_lire_fichier.php?extra=cpcol...

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