29 June 1982 Real-Time Simulation Of The Seasonal And Diurnal Aspect Changes In Real Three-Dimensional Scenes
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This paper presents the principle, the realisation and the results of a system simulating in real-time extremely realistic views of 3D scenes. The simulation considers two factors, namely the seasonal and diurnal illumination variation and the change in the atmospheric visibility. Such effects are responsible for the main aspect changes in real scenes like for instance mountainous terrains. The scene aspect simulation is based on information from a digital terrain model and albedo maps previously derived from aerial photographs. A scene model is assembled in a stage of preprocessing and is then used as the data base for the simulation. The generation of the image itself is performed in real-time. Any modification of the scene illumination and the atmospheric visibility within the scene can be entered interactively and the new aspect of the scene can be seen instantly on the display where the new images are updated at video rate. This simulation system is implemented on a display processor making an intensive use of its transform capabilities via video processor and look-up-tables. The results show typical illumination and visibility effects in various scenes simulating real natural terrain.
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Heinz Hugli and Werner Frei "Real-Time Simulation Of The Seasonal And Diurnal Aspect Changes In Real Three-Dimensional Scenes", Proc. SPIE 0303, Visual Simulation and Image Realism II, (29 June 1982); doi: 10.1117/12.932662; https://doi.org/10.1117/12.932662

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