| 摘要 |
<p>A method and system (10) for adaptively refining an arbitrary progressive mesh representation (72) for a graphical geometric model according to changing view parameters (80) is presented. The method uses efficient selective refinement criteria for view-dependent parameters based on the view frustum (188), surface orientation (190), and screen-space geometric error (192) to produce graphical objects and images such as a graphical terrain. A real-time method for incrementally refining and coarsening the mesh according to the selective refinement criteria is also presented. The real-time method exploits graphical view coherence, and supports frame rate regulation. For continuous motions, the real-time method can be amortized over consecutive frames, and smooth visual transitions (geomorphs) can be constructed between any two adaptively refined meshes used to represent a graphical object or image.</p> |
