Finally a bit of progress on First Plague: tracks don't have to be strictly on a straight line, and scenery chunks try to follow that. To ease that, the chunks must now fit on a tile grid. There is still a long way to go (the amount of scenery would ideally depend on the camera angle, the camera would smoothly follow the track, and there is not yet objects (trees, houses...) in the scenery tiles). Here is a debug view, way above, that shows track parts and scenery appearing and disappearing. https://streamable.com/t62vwd