A point-based system for local and remote exploration of dense 3D scanned models

Abstract

We present a client-server framework for network distribution and real-time point-based rendering of large 3D models on commodity graphics platforms. Model inspection, based on a one-touch interface, is enriched by a bidirectional hyperlink system which provides access to multiple layers of multimedia contents linking different parts of the 3D model many information sources. In addition to view and light control, users can perform simple 3D operations like angle, distance and area measurements on the 3D model. An authoring tool derived from the basic client allows users to add multimedia content to the model description. Our rendering method is based on a coarse grained multiresolution structure, where each node contains thousands of point samples. At runtime, a view-dependent refinement process incrementally updates the current GPU-cached model representation from local or remote out-of-core data. Vertex and fragment shaders are used for high quality elliptical sample drawing and a variety of shading effects. The system is demonstrated with examples that range from documentation and inspection of small artifacts to exploration of large sites, in both a museum and a large scale distribution setting.