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QuadTree LOD

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I have a problem, so i created a QuadTree but when i try to load a heightmap only the first LOD-Level is fine:


But when i come closer, and the LOD-Level increase the Level, i get some ugly "Stairs"


The Heightmap is created with LibNoise.XNA but it's the same with a Heightmap Generated in Photoshop.
The Height is set in the VertexShader.
The Size is 1024x1024.

Anybody can help me?
What Should i do to get a nice smooth Terrain?

Sorry for my english. :)
best regards


here is a another Picture from this Stairs:

stufe.png Edited by montify

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