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Terrain patch blending

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Hi, I'm working on my high school senior project with random 3D terrain generation. What I currently have right now is a system that creates random patches of terrain, with fractal subdivision, and smooths them out a bit so lower pieces of the landscape aren't as rough. What I need to do now is blend the patches of terrain together. I'll need the terrain patches to blend to the 8 neighbors each one has, unless of course it's one on the edge of the grid of patches and doesn't have 8 neighbors. But I was wondering if there were any quick (at least doesn't take a few minutes just for a couple patches to do) and efficient techniques out there for doing this sort of thing.

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