期刊名称：International Journal of Computer Science Issues
印刷版ISSN：1694-0784
电子版ISSN：1694-0814
出版年度：2011
卷号：8
期号：6
出版社：IJCSI Press
摘要：This paper proposes a real-time software for outdoor rendering to control the shadows position with effect of sun\'s position. The position of sun plays an important rule for outdoor games. Calculation of sun\'s position, as a result, position and length of shadows require a lot of attention and preciseness. Julian dating is used to calculate the sun\'s position in the virtual dome. In addition, of computer graphics, building design is another field that this paper contributes on it. To create shadow, projection shadow is proposed. By calculating the sun\'s position in the specific date, time and location on the earth, shadow is generated. Length and angle of shadow are two parameters measured for building design and both of them are calculated in this real-time application. Therefore, it can be used for teachers to teach some part of physics about earth orbit and it can be used in building design and commercial games in virtual reality systems.
关键词：real;time shadow; sun\'s position; sun light; projection shadow
