NISHITA, T., AND NAKAMAE, E. 1987. A shading model for atmospheric scattering considering luminous intensity distribution of light sources. In SIGGRAPH, 303 -- 310.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....but, as they consider all the possible light interactions, they suffer of a long computation time. Older methods [2, 8] focus on simpler light interactions, considering only single scattering. With this approach, and based on ray tracing, the algorithms of N.L. Max [14] and of T. Nishita and al. [16] belong to the fastest algorithms representing a scene with a participating medium covering a whole scene. But, when dealing with gas, fire or smoke, which are concentrated in some areas of the scene, it is necessary either to split these medium in many small participating media, or to cover them ....

T. Nishita, Y. Miyawaki and E. Nakamae. A Shading Model for Atmospheric Scattering considering Luminous Distribution of Light Sources. Computer Graphics, proceeding of SIGGRAPH'87, vol. 21(4), pp. 303-- 310, 1987.

....ray, and returns a fractional transparency. In Max [10] and [18] I show how these integrals can be evaluated under particular conditions, for example, when t is constant or varies only along one dimension. Kaneda et al. 19] also describe a case of one dimensional variation, and Nishita et al. [20] consider multiple light sources when t is constant and opaque polygonal objects are present. A more general two pass numerical algorithm was suggested by Kajiya and Von Herzen [21] The first pass computes the illumination i(X, w) reaching X, as in equation (2) It propagates the flux from the ....

Tomoyuki Nishita, Yasuhiro Miyawaki, and Eihachiro Nakamae, "A Shading Model for Atmospheric Scattering Considering Luminous Intensity of Light Sources", Computer Graphics Vol. 21 No. 4 (July 1987) pp. 303-310.

....spectrum from the accurate to the ad hoc. Kajiya s original work on volume ray tracing for generating images of clouds [Kajiya84] incorporated a physicsbased illumination and atmospheric attenuation model. This work in realistic volume rendering techniques has been extended by numerous researchers [Nishita87, Ebert90, Krueger91, Williams92, Max95, Nishita98]. In contrast, traditional volume rendering has relied on the use of transfer functions to produce artificial views of the data to highlight regions of interest [Drebin88] These transfer functions, however, require in depth knowledge of the data and need to be adjusted for each data set. To ....

Tomoyuki Nishita and Yasuhiro Miyawaki and Eihachiro Nakamae. A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources, Computer Graphics (Proceedings of SIGGRAPH 87), 21 (4), pp. 303-310 (July 1987, Anaheim, California). Edited by Maureen C. Stone.

....will be discussed. It is worth mentioning additional published work in the field of atmospheric illumination which cover other issues not addressed in this project. Two of the new themes include shadows and variable or patchy fog. Work done in the area of shadows comes from Max[8] and Nishita et al.[9] who report good results. The correct rendering of shadows must take into account the volumes of atmosphere which do not receive direct light and so do not contribute to the total scattered intensity. This has been considered by Max and Nishita. Their computations can also render shafts of light, ....

....backwards, with a reduced intensity in a direction perpendicular to the incident light. For larger particles the scattering is much more concentrated in the forward direction. The larger the particle the more concentrated it becomes. This is certainly true for fog. The shadow work of Nishita et al.[9] mentioned in the introduction uses angular functions pro x y z f q An Atmospheric Illumination Model for Computer Graphics Atmospheric Illumination Physics of Scattering 29 portional to (1 Acos k f) where the exponent, k, is equal to 16 and 64. The phase functions of Blinn[5] serve the ....

Nishita, T., Miyawaki, Y. and Nakamae, E. A shading model for atmospheric scattering considering the luminous intensity distribution of light sources Comp. Graph. 21(4) (July 1987) 303 - 310 (SIGGRAPH '87)

....generation approach. The first phase generates all shadows and lighting falling within the refracted light area. The second pass renders all lighting and shadows outside this area. This method creates both the shadow and caustic effects of the refractive surface. In the first pass, a light volume [17] is generated for the refracting face. Shadow volumes are then generated for shadows falling inside this volume. This itself includes two cases; namely objects inside the volume generating shadows and objects outside the volume whose shadows get refracted into the volume. In the first case, the ....

T. Nishita. A shading model for atmospheric scattering considering luminous intensity distribution of light sources. ACM Computer Graphics (Proc. SIGGRAPH '87), 19(3):303--310, 1987.

....packages. While visualization systems for CFD have concentrated on simple illumination and shading models, recent advances in computer graphics for realistic rendering of gases and fluids have produced dra 6 matic and near photo realistic images of water, steam, fog, and smoke [8] 9] 10] 15] 21][28][31] These techniques use physically based rendering techniques to display these natural phenomena realistically. Our systems for CFD visualization combine several techniques that provide the scientist with the option to trade time for image quality and explore the same data set by inspecting ....

T. Nishita, Y. Miyawaki, and E. Nakamae, "A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources", Proceedings of SIGGRAPH'87, Computer Graphics 21(4):303-310, July 1987.

....by the opacity in each layer. The second pass gathered the scattered flux along each viewing ray, taking into account the attenuation between the scattering event and the viewpoint. Voss [Voss83] used a similar method to produce fractal clouds in terrain scenes. Nishita, Miyakawa, and Nakamae [Nish87] have considered anisotropic single scattering in fog, and Inakage [Inak89] has included cases where the density and phase function of the scattering material varies from point to point. Kaneda et al. Kan90] also simulate anisotropic scattering in clouds and fog, including one case of double ....

Tomoyuki Nishita, Yasuhiro Miyakawa, and Eihachiro Nakamae, "A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources" Computer Graphics Vol. 21 No. 4 (July 1987) pp. 303 - 310

....all shadows and lighting falling within the refracted light area. The second pass renders all lighting and shadows outside this area. This method creates both the shadow and caustic effects of the refractive Figure 4.3: Refracted Caustics and Shadows surface. In the first pass, a light volume [Nis87] was generated for the refracting face. Shadow volumes were then generated for shadows falling inside this volume. This itself included two cases; namely objects inside the volume generating shadows and objects outside the volume whose shadows get refracted into the volume. In the first case, the ....

T. Nishita. A shading model for atmospheric scattering considering luminous intensity distribution of light sources. Computer Graphics (SIGGRAPH '87 Proceedings), 19(3):303--310, July 1987.

....physical approximation for the formation and animation of clouds. Gardner, 8] has use solid textured hollow ellipsoids in modeling clouds and more recently produced animations of smoke rising from a forest fire [9] Other approaches include the use of height fields [14] constant density media [13, 15], and fractals [21] The author has developed several approaches for modeling and controlling the animation of 3 1 gases [2, 7, 5, 3, 1] Recently, Stam has used fuzzy blobbies as a three dimensional model for animating gases with good results [20] The purpose of these notes is to describe my ....

Nishita, Tomoyuki, Miyawaki, Yasuhiro, and Nakamae, Eihachiro. A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources. Proceedings of SIGGRAPH'87 (Anaheim, California, July 27-31, 1987). In Computer Graphics 21,4 (July 1987), 303--310.

....all shadows and lighting falling within the refracted light area. The second pass Figure 2.9: Reflected light and shadows renders all lighting and shadows outside this area. This method creates both the shadow and caustic effects of the refractive surface. In the first pass, a light volume [Nis87] is generated for the refracting face. Shadow volumes are then generated for shadows falling inside this volume. This itself includes two cases; namely objects inside the volume generating shadows and objects outside the volume whose shadows get refracted into the volume. In the first case, the ....

T. Nishita. A shading model for atmospheric scattering considering luminous intensity distribution of light sources. ACM Computer Graphics (Proc. SIGGRAPH '87), 19(3):303--310, 1987.

....by the opacity in each layer. The second pass gathered the scattered flux along each viewing ray, taking into account the attenuation between the scattering event and the viewpoint. Voss [Voss83] used a similar method to produce fractal clouds in terrain scenes. Nishita, Miyakawa, and Nakamae [Nish87] have considered anisotropic single scattering in fog, and Inakage [Inak89] has included cases where the density and phase function of the scattering material varies from point to point. Kaneda et al. Kan90] also simulate anisotropic scattering in clouds and fog, including one case of double ....

Tomoyuki Nishita, Yasuhiro Miyakawa, and Eihachiro Nakamae, "A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources," Computer Graphics Vol. 21 No. 4 (July 1987) pp. 303 - 310

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T. Nishita, Y. Miyawaki, E. Nakamae, "A Shading Model for Atmospheric Scattering Considering Distribution of Light Sources," Computer Graphics, Vol. 21, No. 4, 1987, pp. 303-310.

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T. Nishita, Y. Miyawaki, E. Nakamae, \A Shading Model for Atmospheric Scattering Considering Distribution of Light Sources," Computer Graphics, Vol. 21, No. 4 (1987) pp. 303-310.

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T. Nishita, Y. Miyawaki, E. Nakamae, "A Shading Model for Atmospheric Scattering Considering Distribution of Light Sources," Computer Graphics, Vol. 21, No. 4,(1987),pp. 303310.

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T. Nishita, Y. Miyawaki, E. Nakamae, \A Shading Model for Atmospheric Scattering Considering Distribution of Light Sources," Computer Graphics, Vol. 21, No. 4,(1987),pp. 303-310.

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T. Nishita, Y. Miyazaki, E. Nakamae, "Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources," Computer Graphics, Vol. 21, No. 4, 1987, pp.303-310.

....requires a large number of particles. One of the methods to model the density distribution of smoke is to define a function that shows the density distribution of smoke or clouds. Musgrave created a typhoon by a procedural approach using 2 dimensional fractals [4] Gardner [5] and Nishita et al. [6] displayed smoke by using a Fourier series. However, these three methods use mathematical functions to define the smoke flow, so it is difficult to add physical parameters to represent a more realistic smoke flow. There have been several approaches to modelling the flow of the smoke or clouds. For ....

T. Nishita, "A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources," Proc. of SIGGRAPH'87, 1987, pp.303-310.

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T.Nishita, Y.Miyawaki, E.Nakamae, "A Shading Model for Atmospheric Scattering Considering Distribution of Light Sources," Computer Graphics, Vol.21, No.4 (1987) pp.303-310.

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NISHITA, T., AND NAKAMAE, E. 1987. A shading model for atmospheric scattering considering luminous intensity distribution of light sources. In SIGGRAPH, 303 -- 310.

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Nishita T, A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources, Siggraph'87, Computer Graphics, 1987, vol. 21(4), pp. 303-310.

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Nishita, Tomoyuki, Y. Miyawaki, and E. Nakamae. A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distributioin of Light Sources. Computer Graphics(Proceedings of ACM SIGGRAPH '87), 21(4), pp. 303-310, July 1987. 3

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Nishita, Tomoyuki, Miyawaki, Yasuhiro, and Nakamae, Eihachiro. A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources. Proceedings of SIGGRAPH'87 (Anaheim, California, July 27-31,

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T. Nishita, Y. Miyawaki and E. Nakamae. A Shading Model for Atmospheric Scattering considering Luminous Distribution of Light Sources. Computer Graphics, proceeding of SIGGRAPH'87, vol. 21(4), pp. 303-- 310, 1987. 1

No context found.

Tomoyuki Nishita and Yasuhiro Miyawaki and Eihachiro Nakamae. A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources, Computer Graphics (Proceedings of SIGGRAPH 87), 21 (4), pp. 303-310 (July 1987, Anaheim, California). Edited by Maureen C. Stone.

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Nishita, T., Miyawaki, Y., and Nakamae, E., A Shading Model for Atmospheric Scattering Considering Luminous Intensity Distribution of Light Sources. Computer Graphics 1987: 21(4), pp. 303310.

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