2024-03-28T19:01:37Zhttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_oaipmhoai:ipsj.ixsq.nii.ac.jp:000384642023-04-27T10:00:04Z01164:03206:03252:03256
物理的モデルによる3次元物体のひび割れとアニメーションSimulation of Three - Dimensional Cracks and Animationjpnhttp://id.nii.ac.jp/1001/00038464/Technical Reporthttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_action_common_download&item_id=38464&item_no=1&attribute_id=1&file_no=1Copyright (c) 1999 by the Information Processing Society of Japan豊橋技術科学大学情報工学系豊橋技術科学大学情報工学系豊橋技術科学大学情報工学系田上, 靖行広田, 光一金子, 豊久本研究では,自然現象の中の1つひび割れ現象に注目し,分断を含む立体的なひび割れを物理的に表現することを試みた.乾燥によるひび割れの発生や外力(重力)によるひびの促進などをモデル化しシミュレーションを行なった.モデルでは,材料の剛性をバネで,材料の収縮をバネの自然長の減少で,ひびの発生をバネの破断で表した.シミュレーション結果は,発生から成長を含めた生成の様子を動画として表現した.また,小麦粉粘土を対象に選び,モデル化の際に必要となる物体の性質を規定するいくつかのパラメータは,実測を基に決定した.We describe a method for simulating the process of cracking based upon a three-dimensional(3D) physical model. Cracks appear when the stress caused by internal or external force exceeds the tolerable amount. We simulate the process by using a spring network model. The stress in the object material is caused by a deformation (or change of distance) between nodes in the network. Also, the material is broken by cutting springs when they are stretched beyond the tolerable maximum strain. We applied our model to the simulation of cracks that appear on drying clay. The clay contracts or shrinks according to its dryness. Because the surface part dries more quickly than the interior part, the stretching stress appears on the surface part. Consequently, the surface material breaks down, which generates cracks. Our model can simulate natural phenomenon of cracking not only in static status but also the whole animating process reasonably.AN10100541情報処理学会研究報告グラフィクスとCAD(CG)199919(1998-CG-094)13181999-02-262009-06-30