A hybrid LOD based rendering approach for dynamic scenes
K. Hilbert, Guido Brunnett · 2004
In this paper we present a novel LOD based rendering approach that integrates geometry based and image based LOD mechanisms in one system. We assume that every LOD object in the scene is represented by a textured polygonal mesh. In a preprocess we generate a continuous multiresolution model for every LOD object in the scene. During runtime we first check for every LOD object if an appropriate cached approximation generated for former frames is available. If so, this approximation object can be used for rendering the next frame. Otherwise, we extract a new suitable approximation of this object out of its continuous multiresolution model depending on view-dependent criteria. After that, we replace this adaptive geometry-based approximation by an image-based impostor if this is reasonable and efficient. To test efficiency we use resolution-dependent criterion and perform a cost analysis that compares costs for using a geometry-based approximation with costs for using an image-based approximation. Object approximations that have been created in this step are saved in a approximation cache using a LRUmechanism. The selected approximations of LOD objects are used for rendering the next frame.