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Terrains are an essential part of virtual environments in computer games, movies, visual impact studies, archi- tecture, urban design and archaeology. In order to render large terrains in real-time multi-resolution represen- tations are used. The underlying data structures are usually static and do not allow modification of the terrain in real-time. In recent years an increasing number of applications have been developed requiring interactive terrain modelling. In this paper we describe a real-time geometric clipmapping terrain rendering technique for large terrains which allows incremental updates of the underlying data structure. We have combined the method with an interactive sketch-based terrain modelling technique. The clipmap data structure is updated during runtime to synchronise the terrain visualization with changes to the underlying digital elevation map. Tests and examples demonstrate the advantages of our method over traditional approaches. Disadvantages and limitations are discussed and potential solutions for future work are presented.

REAL-TIME TERRAIN RENDERING WITH INCREMENTAL LOADING FOR INTERACTIVE TERRAIN MODELLING