IJSER Home >> Journal >> IJSER
International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 11    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 11, November 2011
Real-Time Sky Color with Effect of Sun's Position
Full Text(PDF, 3000)  PP.  
Author(s)
Hoshang Kolivand, Mohd Shahrizal Sunar
KEYWORDS
Sky color, Sun’s position, Real-time, Outdoor rendering
ABSTRACT
In the rendering of outdoor scenes in virtual environments, the sun's position, sky color, clouds, shadow, trees, grass etc play very important roles in making it realistic. In this paper Sky color and the sun's position are combined. Specific longitude, latitude, date and time are required parameters to calculate the exact position of the sun. The sun's position is calculated based on Julian dating; the sky's color is created by Perez modeling. A functional application is designed to show the position of the sun and then sky color in arbitrary location, date and time. It can be possible to use this application in commercial games for outdoor rendering and for teachers to teach some part of physics about earth orbit and effect of the sun on the sky and it can be used in building design.
References
[1] S. Nawar, A.B. Morcos, J.S. Mikhail,” Photoelectric study of the sky brightness along Sun’s meridian during the March 29,” New Astron-omy, Vol. 12, pp. 562–568,2007.

[2] H.D. Kambezidis, D.N. Asimakopoulos, C.G. Helmis, ”Wake Mea-surements Behind a Horizontal-Axis 50 kW Wind Turbine, ” Solar Wind Tech Vol. 7, pp. 177-184,1990.

[3] M.S. Sunar, M.N. Zamri,” Advances in Computer Graphics and Virtual Environment” UTM Malaysia, 2007.

[4] J.F. Blinn, ”Light refection functions for simulation of clouds and dusty surfaces,” ACM Transactions on Graphics, Vol. 16:21-29, 1982.

[5] R.V. Klassen,” Modeling the effect of the atmosphere on light, ” ACM Transactions on Graphics, Vol. 6, pp. 215-237, 1987.

[6] K. Kaneda, T. Okamoto, E. Nakamae, T. Nishita, ” Photorealistic image synthesis for outdoor scenery under various atmospheric con-ditions, ” The Visual Computer, Vol. 7, pp. 247-258, 1991.

[7] T Nishita, E. Nakamae, Y Dobashi, ” Display of clouds and snow taking into account multiple anisotropic scattering and sky light, ” In Rushmeier, H., ed., SIGGRAPH 96 Conference Proceedings, Annual Conference Series, 379-386. Addison Wesley. held in New Orleans, Louisiana, 04-09 August 1996.

[8] K. Tadamura, E. Nakamae, K. Kaneda, M. Baba, H. Yamashita, T. Nishita,” Modeling of Skylight and Rendering of Outdoor Scenes, ” Computer Graphics Forum, Vol. 12, pp. 189-200, 1993.

[9] Y. Dobashi, T. Nishita, K. Kaneda, H. Yamashita,” A fast display method of sky colour using basis functions,” The Journal of Visuali-zation and Computer Animation, Vol. 8, pp. 115-127, 1997.

[10] A.J. Preetham, P Shirley, B. Smith, ” A practical analytic model for daylight,” Computer Graphics,(SIGGRAPH '99 Proceedings), 91-100, 1999.

[11] R. Perez, R. Seals, J. Michalsky, ”All-weather model for sky lumin-ance distribution - preliminary configuration and validation,” Solar Energy, Vol. 50, pp. 235-245, 1993.

[12] M.S. Sunar, N.A. Gordon,”Real-Time Daylight Sky Color Modeling,” Advances in Computer Graphics and Virtual Environment, 37-55, 2001.

[13] S. Li, G. Wang, E. Wu, ”Unified Volumes for Light Shaft and Shadow with Scattering,” IEEE, 161-166, 2007.

[14] S.M. Halawani, M.S. Sunar,” Interaction between sunlight and the sky color with 3D objects in the outdoor virtual environment,” Fourth International Conference on Mathematic/Analytical Model-ing and Computer Simulation, 470-475, 2010.

[15] V.M. Viswanatha, Nagaraj B. Patil, M.B. Sanjay Pande, Processing of Images Based on Segmentation Models for Extracting Textured Component, International Journal of Scientific & Engineering Re-search Vo. 2, no. 4, April-2011.

[16] D. Gutierrez, F.J. Seron, A. Munoz, O. Anson, ” Simulation of at-mospheric phenomena,” Computers & Graphics, Vol. 30, pp. 994-1010 , 2006.

[17] M. Iqbal, ”An introduction to solar radiation,” Academic Press. 1983, pp. 390.

[18] CIE, International commission on illumination. http://www.cie.co.at/cie/home.html,2011. Cited 16 July 2011.

[19] B. Berlin, P. Kay, ” Basic color terms,” Berkeley: University of Cali-fornia, Reprinted, 1991.

[20] B.W. Kimmel, G.V.G. Baranoski, ”Simulating the appearance of sandy landscapes,” Computers & Graphics, Vol. 34, pp. 441-448, 2010.

[21] L. Rayleigh,” Experiments on colour,” Nature (London), 25, pp. 64–66, 1881.

[22] R Penndorf, MIE scattering in the forward area. Infrared Physics, Vol. 2, pp. 85-102, 1962.

Untitled Page