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18
Terrain Geometry—LOD
Adapting Concentric Rings
Florian Bösch
18.1 Introduction
Nested concentric rings are a common LOD scheme in geometric clipmapping and other
terrain rendering algorithms. We will cover geomorphing, mipmapping and MIP selec-
tion, detail mapping, and interpolation methods. For practical reasons (size and scope
of this chapter and example code distribution feasibility), we substitute virtual texturing
aspects, such as megatextures or clipmapping, etc., with lookups to a small repeatable
texture. e texturing function can be exchanged for any more elaborate scheme if so
desired.
At the basis of any large-scale terrain-renderi ...