Abstract
Soft shadow with respect to the sun's position in virtual environments is a fascinating topic in outdoor rendering. A coherent mathematic formula to create shadow with respect to the sun's position in specific location, date and time can make outdoor rendering as easy as indoor rendering. A target of this study is to propose a new coherent formula to do this. Outdoor rendering using a coherent formula will eliminate worrying about the sun's position and shadow status during the daytime. Low frames per second (FPS) in real-time rendering is a crucial problem in computer graphics, especially in soft shadow generation. A novel technique to create soft shadow in virtual environments is proposed. Geometric progression to select the color and a combination formula using sequence progression are proposed to determine the sample size. The new soft shadow generation, in addition to increasing FPS, enhances the quality of soft shadows. Finally, we strongly contend that the proposed technique can be used in commercial gaming and virtual reality systems. [Kolivand, H, Sunar, M.S., Altameem, A., Rehman, A. A New Coherent Technique for Real-Time Shadow Generation with Respect to the Sun's Position. Life Sci J 2012;9(4):1039-1045] (ISSN:1097-8135). http://www.lifesciencesite.com. 158