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A method for estimating the errors in many-light rendering with supersampling

Computational Visual Media 2019年第2期5卷 151-160页

作者： Hirokazu Sakai Kosuke Nabata Shinya Yasuaki kei iwasaki Wakayama University WakayamaWakayama640-8510Japan Dwango CG Research KADOKAWA Hongo Bldg.5245 HongoBunkyo-kuTokyo1130033Japan

In many-light rendering, a variety of visual and illumination effects, including anti-aliasing,depth of field, volumetric scattering, and subsurface scattering, are combined to create a number of virtual point lights(VPLs). This is done in order to simplify computation of the resulting illumination. Naive approaches that sum the direct illumination from many VPLs are computationally expensive;scalable methods can be computed more efficiently by clustering VPLs, and then estimating their sum by sampling a small number of VPLs. Although significant speed-up has been achieved using scalable methods, clustering leads to uncontrollable errors, resulting in noise in the rendered images. In this paper, we propose a method to improve the estimation accuracy of manylight rendering involving such visual and illumination effects. We demonstrate that our method can improve the estimation accuracy by a factor of 2.3 over the previous method.

关键词： anti-aliasing depth of field many-light rendering participating media

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Temporal and spatial anti-aliasing for rendering reflections on water waves

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Computational Visual Media 2021年第2期7卷 201-215页

作者： Namo Podee Nelson Max kei iwasaki Yoshinori Dobashi Hokkaido University Sapporo060-0814Japan University of California Davis95616USA Wakayama University Wakayama640-8441Japan

The reflection of a bright light source on a dynamic surface such as water with waves can be difficult to render well in real time due to reflection aliasing and *** this paper,we propose a solution to this problem by approximating the reflection direction distribution for the water surface as an elliptical Gaussian *** we analytically integrate the reflection contribution throughout the rendering interval *** method can render in real time an animation of the time integrated reflection of a spherical light source on highly dynamic waves with reduced aliasing and flickering.

关键词： real-time rendering anti-aliasing reflection water surface water waves elliptical Gaussian

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Visual simulation of clouds

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Visual Informatics 2017年第1期1卷 1-8页

作者： Yoshinori Dobashi kei iwasaki Yonghao Yue Tomoyuki Nishita Hokkaido University/UEI Research Japan Wakayama University/UEI Research Japan The University of Tokyo Japan UEI Research/Hiroshima Shudo University Japan

Clouds play an important role when synthesizing realistic images of outdoor *** realistic display of clouds is therefore one of the important research topics in computer *** order to display realistic clouds,we need methods for modeling,rendering,and animating clouds *** is also important to control the shapes and appearances of clouds to create certain visual *** this paper,we explain our efforts and research results to meet such requirements,together with related researches on the visual simulation of clouds.

关键词： Clouds Procedural modeling Image-based modeling Fluid simulation Feedback control Genetic algorithms

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A CHALLENGE TO DEVELOPAN INEXPENSIVE“SPIRAL VORTEX PUMP”

A CHALLENGE TO DEVELOPAN INEXPENSIVE“SPIRAL VORTEX PUMP”

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亚州仿真会议暨第五届系统仿真和科学计算国际会议

作者： Tomohiro Tsujimoto Kiyotaka iwasaki Wataru Saeki kei Yoshida Makoto Arita Mitsuo Umezu Kou Imachi Kazuhiko Ishihara Takashi Tanaka Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Science and Engineering Waseda UniversityTokyo Japan The University of Tokyo Tokyo Japan The University of Tokyo Tokyo Japan Yasuhisa Biomechanics Inc. Tokyo Japan.

It is well known that the cost of artificial heart is more expensive than other cardiovascular devices and its cost still tends to increase. The cost is one of the important factors to be chosen by

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