Top-Down View-Dependent Terrain Triangulation using the
Technical report, Institut für Angewante Mathematik, 2003.
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In this paper, we introduce the octagon metric as a universal distance metric for the interactive visualization of large-scale terrain data. Based on recursive bisection triangle meshes, this metric automatically ensures valid triangular meshes without cracks or T-junctions. We will show how the octagon metric can be used for view-dependent refinement at little computational cost and with no additional storage requirements. It can easily be combined with a suitable geometric error metric to extract and render adaptive view-dependent terrain meshes in an output-sensitive way. We will show the performance of the whole system, which is straightforward to implement, in several examples.