A practical analytic model for daylight
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Shadow algorithms for computer graphics
SIGGRAPH '77 Proceedings of the 4th annual conference on Computer graphics and interactive techniques
GPU Based Real-time Shadow Research
CGIV '06 Proceedings of the International Conference on Computer Graphics, Imaging and Visualisation
Interaction between Sunlight and the Sky Colour with 3D Objects in the Outdoor Virtual Environment
AMS '10 Proceedings of the 2010 Fourth Asia International Conference on Mathematical/Analytical Modelling and Computer Simulation
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This paper introduced new real-time application for outdoor computer graphic programming to control the amount of shadow 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 designers and both of them are calculated in this proposed real-time application. Therefore, it can be used for teachers to teach some part of physics about earth orbit and effect of sun on shadow and it can be used in building design and commercial games in virtual reality systems.