I'm currently building a city but I can't even see half of the map at once. I think the render distance is around 4,000 studs. How do I change it to, say, 20,000 studs?
You cant, only way is to turn the lag on (High graphics settings)
I personally think they should add more graphics options, so you can manually change render/draw distance, change graphics detail etc.
They are simple spheres, not models, he used a script to calculate the size and position of the spheres and where the should go, then placed them using the script