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« on: July 05, 2011, 05:27:26 pm »
Do the break-into-many-parts, but instead break the cube in 8 sub cubes, and check wich ones will be affected and break those down too until you have the desired level of accuracy, and then remove some minicubes.
That would work, you could build the terrain using huge cubes underground and over ground you could break them down to make it smooth. Also you should not render them as cubes, but do something to cut the edges on sides/corners with no adjacent cubes.
Or, you could make the terrain using really-low-quality spheres but that might be ugly and/or lag.