Portal’s physics engine rebuilt in 25KB—on a graphing calculator | Ars Technica # EPIC

Marcolina also had to attempt to replicate the characteristic Portal level design, but under severe memory constraints (graphing calculators are barely modern devices any more, having only just recently gotten color screens). Apps in a graphing calculator are limited to executing 16 kilobytes of code, a severe constraint given the amount of animation involved, Marcolina said.

Overall, he favored levels that are more mentally challenging, like the earlier levels of the original Portal, rather than the later levels that require good timing and hand-eye coordination. “Levels that require extreme dexterity to solve wouldn’t work very well due to the less than optimal control,” Marcolina said.

Portal’s physics engine rebuilt in 25KB—on a graphing calculator | Ars Technica.

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