In many industrial designs, such as automobiles and electrical products, evaluating the quality of curved surfaces in the design is very important. H the designer can confirm shapes of curved surfaces visually, working with photo-realistic computer generated images, the designer 2019;s “sense” is well utilized. In this paper we will demonstrate method for producing images which can be used by designers to evaluate the visual quality of free-form curved surfaces. The method uses the reflected images of cylindrical light sources. It is important that curved surfaces be displayed accurately, without polygonal approximation, and that the generated images be photo-realistic images, including shadows. The shading model presented in this paper satisfies these requirements.
Many offices, classrooms, and factories are lit with multiple fluorescent lamps arrayed in parallel rows on the ceiling. The shading technique presented in this paper is applicable to estimation of illuminance distribution in such an environment. Our method performs hidden surface removal and shadowing of curved surfaces without polygonal approximation, yielding accurate display.
- Cylindrical light sources
- quality of curved surfaces
- Bézier surfaces
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Appel, A., (1967) The Notion of Quantitative invisibility and the Machine rendering of Solids. Proc. of the AOM National Conference, pp.387–393.
Baum, D.R., Rushmeier H. E., Winget, J. M.(1989) Improving Radiosity Solutions Through the Use of Analytically Determined Form-Factors. Computer Graphics, Vol.23, No.3, pp.325–334.
Beck, J., Farouski, T., Hinds, J.(1986) Surface Analysis Methods. IEEE OG & A, Vol.6, No.12, pp.18–36.
Dill, J.C.(1981) An Application of Color Graphics to the Display of Surface Curvature. Computer Graphics, Vol. 15, No.3, pp.153–161.
Farin, G.(1985) A modified Clough-Tocher interpolant. OAGD, Vol.2(1985) pp.19–27.
Higashi, M., Kushimoto, T., Hosaka, M.(1990) On Formulation and Display for Visualizing Features and Evaluating Quality of Free-Form Surfaces. Proc. of EUROGRAPHIOS ‘ 90 pp.299–309.
Kajiya, J.T.(1982) Ray Tracing Parametric Patches. Computer Graphics, Vol 16, No.3, pp.245–254.
Kajiya, J.T.(1986) The Rendering Equation. Computer Graphics, Vol. 20, No 4, pp.143–150.
Klass, R.(1980) Correction of local surface irregularities using reflection lines. OAD, Vol 12, No.2, pp.73–77.
Lane, J.M., Carpenter, L.C., Whitted, T., Blinn, J.F. (1980) Scan Line Methods for Displaying Parametrically Defined Surfaces. CACM, Vol 23, No.1, pp.23–34.
Nakamae, E., Harada, K., Ishizaki, T., Nishita, T.(1986) Montage: The overlaying of the Computer Generated hnage onto a Background Photograph. Computer Graphics, Vol 20, No.3, pp.207–214.
Nishita, T., Nakamae, E.(1983) Half-Tone Representation of 3-D Objects llluminated by Area Sources or Polyhedron Sources. IEEE COMPSAC pp.237–242.
Nishita, T., Okamura, I., Nakamae, E.(1985) Shading Model for Point and Linear Sources. ACM Tog, Vol 4, No.2, pp.124–146.
Nishita, T., Nakamae, E.(1985) Continuous Representation of Three Dimensional Objects Taking into Account of Shadows and Inter-reflection. Computer Graphics, Vol 19, No.3, pp.23–30.
Nishita, T., Nakamae, E.(1986) Continuous Representation of Three Dimensional Objects illuminated by Sky Light. Computer Graphics, Vol.20, No.3, pp.125–132.
Nishita, T., Sederberg, T., Kakimoto, M.(1990) Ray Tracing Rational Trimmed Surface Patches. Computer Graphics, Vol.24, No 4, pp.337–345.
Nishita, T., Kaneda, K., Nakamae, E.(1991) Scanline algorithm for displaying trimmed surfaces by using Bezier clipping. The Visual Computer, Vol.7, No.5–6, pp.269–279.
Phong, B. (1975) Illumination for Computer Generated Pictures. CACM, Vol 18, No.6, pp.311–317.
Poulin, P., Amanatides, J.(1990) Shading and Shadowing with Linear Light Sources. EUROGRAPHICS’ 90, pp.377–386.
Saito, T., Takahashi, T.(1990) Comprehensible Rendering of 3-D Shapes. Computer Graphics, Vol.24, No.4, pp.197–206.
Satterfield S. G., Rogers, D.F.(1984) A Procedure for Generating Contour Lines from B-spline Surfaces. IEEE CG & A, Vol 4, No.1, pp.61–74.
Verbeck, C.P., Greenberg, D.P.(1984) A Comprehensive Light Source Description for Computer Graphics. IEEE CG & A, Vol 4, No.7, pp. 66–75.
Wallace, J. R., Elmquist, K. A., Haines, E. A.(1989) A Ray Tracing for Progressive Radiosity. Computer Graphics, Vol.23, No.3, pp.315–324.
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© 1992 Springer-Verlag Tokyo
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Nishita, T., Takita, S., Nakamae, E. (1992). A Shading Model of Parallel Cylindrical Light Sources. In: Kunii, T.L. (eds) Visual Computing. CG International Series. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68204-2_27
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-68206-6
Online ISBN: 978-4-431-68204-2
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