Eidos published an isometric game I coded in the 90s: https://en.wikipedia.org/wiki/Abomination:_The_Nemesis_Project https://en.wikipedia.org/wiki/Abomination:

Eidos published an isometric game I coded in the 90s: https://en.wikipedia.org/wiki/Abomination:_The_Nemesis_Project https://en.wikipedia.org/wiki/Abomination:_The_Nemesis_Proje... This article doesn't go into what a bitch isometric is. I remember spending a full day just on the calculation to go from 2D mouse pointer position->3D x,y,z tile position being clicked on. And the game was supposed to be all pixel art. But then you have to render thousands of frames of bitmaps for the characters to have 8 DoF with every frame of every action they can make (walk, run, shoot, climb, etc), which adds up to a quadrillion MB of graphics. So during development it was decided the game would be 3D poly characters over 2D iso tile backgrounds. So, converting the whole game was fun. Those were the days before 3D engines really existed. The 3D engine was the one you wrote.