A study on mesh reduction for water surface【Cancel】

Reference No.	20200006
Type/Category	Grant for General Research-Short-term Joint Research
Title of Research Project	A study on mesh reduction for water surface【Cancel】
Principal Investigator	Yoshinori Dobashi（Faculty of Information Science and Technology, Hokkaido University・Associate Professor）
Research Period
Keyword(s) of Research Fields	mesh reduction, water surface, visualization
Abstract for Research Report	The goal of this study is efficient visualization of fluid phenomena by using computer graphics techniques. Visualization of fluid phenomena is one of the important research topics in computer graphics and is widely used for not only entertainment applications such as movies and video games but also disaster simulations. However, a serious problem with visualization of fluid phenomena is its high computational cost. In this study, we focus on visualization of water, where the water surface is represented by a triangular mesh. The computation time for generating an image is approximately proportional to the number of triangles. The size of the mesh obtained by the high-resolution fluid simulation is usually huge, resulting in the extremely expensive computational cost. However, many of the triangles are not visually important in the rendered image.The regions far from the viewpoint should have little effects on the visualization results due to reflection, refraction, and scattering. Our study expoits this property to reduce the number of the triangles. We calculate the visual importances of the triangles and remove those with smaller importances. We also take into account the temporal and spatial coherency to avoid the discontinuities in the animation. In summary, the purpose of this study is to develop 1) calculation method of the visual importance taking into account the reflection, refraction and scattering of light, and 2) mesh reduction method using the visual importance while taking into account the temporal and spatial coherency. We expect that this study will reduce the computational cost from 1/2 to 1/4. We also expect that portability of the mesh data is improved particularly for a distributed rendering environment where mesh data is shared among multiple machines .
Organizing Committee Members (Workshop) Participants (Short-term Joint Usage)	Yoshinori Dobashi（Hokkaido University・Associate Professor） Takayuki Oba（Hokkaido University・Graduate Student） Hiroyuki Ochiai（Kyushu University・Professor） Ken Anjyo（OLM Digital Inc.・Executive R&D advisor） Syuhei Sato（Toyama University・Assistant Professor）