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Terrain LOD

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Hey all, I am trying to figure out a good way to generate terrain from a heightmap where the flat portions of the terrain use less polygons, and the bumpy portions are made up of more polygons. The technique I tried created T-Junctions which I hear are bad because they can cause artifacts. Are there any links or books you can point me towards to help me with this problem, and any good books on terrain in general?

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Here's an interesting read

http://www.fsinsider.com/developers/Pages/GlobalTerrain.aspx
The 5th image refers to the poly-reduce method you are interested in.

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The classic one is ROAM, but it isn't used much anymore because it requires lots of CPU work (whereas most new techniques are geared towards moving work to the GPU).

You could easily adapt the ROAM algorithm to simply optimise the mesh overall (e.g. merging flat areas into less triangles) instead of using it in real-time to constantly optimise for the current view-point.

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