LÖVE

Thanks, @milon, I did see that it was an old post. I just recently came across the Textured Raycaster demo and thought it was quite interesting and tweaked it to work for mobile iOS in case others were interested. I'm also aware and have tried out Groveburger's 3D Engine. That project has been a bit more challenging to get to work all the time on mobile iOS. I've also found the 3DreamEngine project: https://github.com/3dreamengine/3DreamEngine works well on mobile iOS.

Gotcha. And it's cool that you posted an update for others. I don't own any Apple products, so I didn't really pay attention to the iOS bit - and I had no idea this would be easier to get working on iOS than Groverburger's. My bad!