Fast Image-Based Ambient Occlusion IBAO
The International Journal of Virtual Reality, 2011, 10(4):61-65 61 Fast Image-Based Ambient Occlusion IBAO Robert Sajko and Zeljka Mihajlovic University of Zagreb, Faculty of Electrical Engineering and Computing,Department of Electronics, Microelectronics, Computer and Intelligent Systems Ambient lighting is an approximation of the light reflected from Abstract— The quality of computer rendering and perception other objects in the scene. Its presence reveals the spatial of realism greatly depend on the shading method used to relationship between objects, their shape, depth and surface implement the interaction of light with the surfaces of objects in a complexity details. Ambient lighting can be locally occluded scene. Ambient occlusion (AO) enhances the realistic impression by nearby object or a fold in the surface. Ambient occlusion of rendered objects and scenes. Properties that make Screen produces only subtle visual cues, however, they are very Space Ambient Occlusion (SSAO) interesting for real-time important in natural perception and thus also in a convincing, graphics are scene complexity independence, and support for fully dynamic scenes. However, there are also important issues with realistic lighting model. current approaches: poor texture cache use, introduction of noise, Modern consumer GPUs offer impressive computational and performance swings. power which has allowed the use of various techniques and In this paper, a straightforward solution is presented. Instead algorithms in real-time computer graphics that were previously of a traditional, geometry-based sampling method, a novel, possible in offline rendering only. One such technique is image-based sampling method is developed, coupled with a ambient occlusion, which approximates soft shadows due to revised heuristic function for computing occlusion.
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