“Continuous tone representation of three-dimensional objects taking account of shadows and interreflection” by Nishita and Nakamae

  • ©Tomoyuki Nishita and Eihachiro Nakamae

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    Continuous tone representation of three-dimensional objects taking account of shadows and interreflection

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Abstract:


    The effect of shadows and interreflection created by room obstructions is an important factor in the continuous tone representation of interiors. For indirect illumination, in most cases a uniform ambient light has been considered, even though the interreflection gives very complex effects with the shaded images.The proposed method for indirect lighting with shadows results in the following advanced points:1) The indirect illuminance caused by the surfaces of objects such as ceilings, floors, walls, desks, bookcases etc. gives added realism to images.2) The proposed method is suitable for every type of light source such as point sources, linear sources, and area sources.

References:


    1. Bui-Tuong,Fhong : Illumination for Computer- Generated Pictures, Comm. ACM, Vol.18, No.6 (1975) pp. 311-317.
    2. Cook, R.L. and Torrance, K.E.: A Reflectance Model for Computer Graphics, ACM Trans. on Graphics, Vol.l, No.i(1982) pp.7-24.
    3. Blinn, J.F. and Newell, M.E.: Texture and Reflection in Computer Generated Images, Comm. ACM, Vol.19, No. i0(1976) pp~542-546.
    4. Illuminating Engineering Society of North America, IES LIGHTING HANDBOOK Reference Volume (1981).
    5. Takahashi, Ishino et al. : Computer Method for Predetermining Illuminance in an Interior Lighting Installation, Journal of Illuminating Institute of Japan(Japanese), Voi.54, No.12 (1970) pp.697-707.
    6. Jensen, P. and Lewin, I. : The Effect of Room Obstructions on the Calculation of Interreflected Components, IES Tech. Conf. Priprint _No. 29(1982).
    7. Goral, C .M., Torrance ,K. E. , Greenberg,D. P. and Battaile, B. : Modeling the Interaction of Light Between Diffuse Surfaces, Computer Graphics, Vol.18,No.3(1984 ) pp.213-222.
    8. Nishita, T., Okamura,I. and Nakamae,E.: Shading Models for Point and Linear Sources, submitted for publication(TOG) (1983).
    9. Nishita, T. and Nakamae, E. : Half-Tone Representation of 3-D Objects Illuminated by Area Sources or Polyhedron Sources, Proceedings of The IEEE Computer Society’ s International Computer Software and Applications Conference (COMPSAC) (1983) pp. 237-241.
    10. Nishita, T. and Nakamae,E. : An Algorithm for Half-tone Representation of Three-Dimensional Objects, Information Processing in Japan, Vol.14 (1974) pp.93-99.
    11. Nishiata, T. and Nakamae,E. : Half-Tone Representation of 3-D Objects with Smooth Edges by Using a Multi-Scanning Method,Transactions of Information Processing Society of Japan (Japanese), Vol. 25, No.5(1984) pp.703-Tll.
    12. Crow, F.C. : Shadow Algorithms for Computer Graphics, Computer Graphics, Vol.ll, No.2(1977) pp. 242-247.


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