A multiresolution control method using view directional feature

The technique using multiresolution models is one of the research efforts to render complex virtual world in real-time. It is desirable for a multiresolution model to preserve the prominent visual features. In this paper, we present a mechanism that generates the multiresolution model in real-time. Our model incorporates the so-called view dependent features directly into the model generation process. One of the consequences is that object silhouette, that is regarded as the primary feature for visual perception, is preserved in low-resolution representations. To facilitate the real time generation of multiresolution model, a new data structure called multiresolution view sphere is devised. The view sphere maps the directional relationship between object surface and the viewpoint. Using the view sphere, coherence of surface orientation in the object space is mapped into spatial coherence in the view sphere. In this paper we present fast algorithm to construct multiresolution view sphere and rendering method that preserves object silhouette.