Journal for Geometry and Graphics 11 (2007), No. 1, 045--057
Copyright Heldermann Verlag 2007
Development of a High Quality Expression System of Natural Elements Using the Real-Time Simulation Method
Tomohiro Fukuda
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
fukuda@see.eng.osaka-u.ac.jp
Kazuhiro Sakata
ORIX Corporation, 2-4-1 Hamamatsu-cho, Minato-ku, Tokyo 105-6135, Japan
kazuhiro_sakata@ore.orix.co.jp
Wookhyun Yeo
Dept. Housing and Interior Design, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
Atsuko Kaga
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
For a real-time simulation by Virtual Reality technology an expression method of sunlight, shadows, grass, and water is developed. These are elements requiring especially high operating frequency in a landscape simulation. For shadow expression, two functions are required: the movement of a light source to duplicate a solar orbit, and the rendering of shadows. For grass expression, texture mapping is performed by a shader program using HLSL (High Level Shader Language), raising the transparency of each polygon. For water expression, refraction of light is expressed with HLSL by carrying out bump mapping of the image under the water surface to the material of a water surface object. Reflection of light is realized by piling up the upside-down picture which sets a dummy camera to the position which reversed the camera to the water surface, and a dummy camera draws on it by HLSL to the material of a water surface object.
Keywords: Environmental design, real-time simulation, virtual reality, expression of natural elements, close-range view, system development.
MSC: 68U05; 51N05
[ Fulltext-pdf (768 KB)] for subscribers only.