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Quadtree vs GeoMipMapping

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You might want to read a bit more about both of them since I think you don''t undersand both of them fully. They mainly solve different things. QT is used for culling while GMM is for LOD, so there is not problem mixing them.

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What? I have read some papers, I think that the QT hierarchy is very good for culling but the QT was created for LOD. For example this paper.
Real-Time Generation of Continuous Levels of Detail for Height Fields Stefan Roettger, Wolfgang Heidrich, Philipp Slusallek, and Hans-Peter Seidel. http://www.vis.uni-stuttgart.de/~roettger/data/Papers/TERRAIN.PDF

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