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Help needed in culling procedural terrain

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Hello! I want to use noise to generate heightmaps for the terrain and when the camera gets close to an edge another heightmap is generated and tiled. My problem is that Im having trouble finding out where the camera is in relation to the heightmap so I can do culling. Ive read a lot of info on terrain rendering but I havent found anything that would be nice for a procedural terrain without any precalculations or storage. All I could come up with so far is to store the pixel position on the heightmap and find the distance to the edges. Does anyone have any prior experience with this or any ideas/info? Thanks!

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