Tricky thing with the likes of
Skyroads is the raised sections. When the surface is flat, as in
Trailblazer and
Roger the Pangolin, it's easy to present it in a pseudo-3D appearance. If you start from an overhead 2D view, really you're just distorting the view; squeezing and stretching it so it looks like it goes into the distance, yet it's still just a 2D image. Just like the roadway in any 8-bit racing game. But as soon as you need things to appear at different levels, then you've got a problem, as then you have to consider the third dimension.
I'd love to be able to render something like that, as I've always wanted to do
I,Robot in 3D on the Speccy. The best I managed was something like a flat chequerboard in three colours on the ST, but not solid 3D blocks.
You can make singular obstructions in the roadway with sprites, just like cars and trackside objects in a racing game. And even make the whole road appear to rise and fall like a hill, but to make individual chunks of the road run higher and lower is a much tougher processing task.
Anyway, have a look at Hewson's
https://spectrumcomputing.co.uk/entry/1 ... Eliminator, although it's a bit shootier.
