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Research of Acceleration Structures for Dynamic Scenes Based on Ray Tracing

Author: LiangYan
Tutor: JinHanJun
School: Central China Normal University
Course: Applied Computer Technology
Keywords: Ray Tracing Accelerating structure Octree Hierarchical bounding volume Scenes
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 59
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Abstract


Ray tracing algorithm is a simple principle, convenient and can generate high-realistic image rendering algorithms, have been widely used in the area of ??non-real-time rendering. With the development of computer hardware conditions and the new algorithm has better rendering, ray tracing algorithm is applied to interactive systems, and dynamic scene. Dynamic complex scenes, due to the complexity of the scene objects and scenes dynamic update features real-time rendering, ray tracing is still hot and difficult research. To address this problem, the dynamic complex scene involving a variety of different sports types of objects, according to the motion characteristics of objects, the object is divided into three categories: static objects, local moving objects, moving objects. Appropriate acceleration structures were constructed for each class of objects. To build global octree the scene static geometry acceleration structure decision-making, and the maximum depth of the octree to terminate divided; build local octree of local motion objects, its construction can be achieved by increasing the global octree depth ; build a two-tier level of dynamic geometry bounding box structure to effectively support its regular motion in the scene. Three acceleration structures dynamic scene, introducing a three-tier organization to manage. The top layer is a global organization of the entire static scene octree; intermediate layer is a local store local motion objects octree storage moving objects BVH two accelerated structural information are stored in the global octree structure on; bottom, lazy build BVH, this layer does not significantly build further through the moving object only when light passes through the global octree a subspace grid, BVH when building. Finally, the BART (A Benchmark for Animated Ray Tracing) dynamic ray tracing benchmark dynamic ray tracing benchmark scene data and its source framework and specific experiments, focusing on the test scenario Kitchen Robot was tested with two layers of tissue way of BVH BVH BVH Kd-tree tree to achieve the results were compared. Analysis of experimental results data, concluded: objects in dynamic scene classification and proper acceleration structures were constructed, three accelerating structure with a three-tier organization management, in line with the movement of objects type classification standard dynamic scenes can achieve better Global renderings, to some extent, to solve the problem of real-time rendering of dynamic scenes.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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