Exploiting temporal coherence in real-time rendering
ACM SIGGRAPH ASIA 2010 Courses
Temporal Coherence Methods in Real-Time Rendering
Computer Graphics Forum
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This paper presents an efficient keyframeless image-based renderingtechnique. An intermediate image is used to exploit the coherencesamong neighboring frames. The pixels in the intermediateimage are first rendered by a ray-casting method and then warpedto the intermediate image at the current viewpoint and view direction.We use an offset buffer to record the precise positions of thesepixels in the intermediate image. Every frame is generated in threesteps: warping the intermediate image onto the frame, filling inholes, and selectively rendering a group of old pixels. By dynamicallyadjusting the number of those old pixels in the last step, theworkload at every frame can be balanced. The pixels generated bythe last two steps make contributions to the new intermediate image.Unlike occasional keyframes in conventional image-based renderingwhich need to be totally rerendered, intermediate images onlyneed to be partially updated at every frame. In this way, we guaranteemore stable frame rates and more uniform image qualities. Theintermediate image can be warped efficiently by a modified incremental3D warp algorithm. As a specific application, we demonstrateour technique with a voxel-based terrain rendering system.