| Summary: | 碩士 === 國立交通大學 === 資訊工程系 === 88 === Daylight is the most economical and natural light source, and will differ when the location of sun, time of the day, and the weather condition vary. Dynamically simulating daylight based on the traditional radiosity method and making it a smooth animation is no easy task. We propose an approach which treats light sources in the scene as independent as a sole light source in the progressive refinement radiosity (PRR) framework. By means of performing independent PRR computation for each luminaire with which stores the shot and unshot radiosity, the radiosity of polygons in the scene due to each luminaire can be linearly combined to achieve the final image as luminaires all have being functioning in the process of energy exchange. When changing the sky parameters or simulating the daylight, our proposed method can preserve geometry information of the scene, thus avoiding recomputing the radiosity from the scratch. Therefore, rapid rendering and displaying make daylight simulation with smooth animation possible. When the user expects to observe the daylight effects within a duration of time, he can only specify the starting and ending time of the simulation and the time slot for observation. Our proposed method can effectively simulate the daylight, while performing a vivid animation for observing the lighting variation.
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