Reconstructing and editing fluids using the adaptive multilayer external force guiding model  

作　　者：Xiaoying NIE Yong HU Xukun SHEN Zhiyuan SU 

机构地区：[1]State Key Laboratory of Virtual Reality Technology and Systems,Beihang University,Beijing 100191,China [2]School of New Media Art and Design,Beihang University,Beijing 100191,China

出　　处：《Science China(Information Sciences)》2022年第11期103-118,共16页中国科学（信息科学）（英文版）

基　　金：supported in part by National Key R&D Program of China(Grant No.2019YFF0301305);National Natural Science Foundation of China(Grant No.U19A2063)。

摘　　要：Reconstructing monocular fluids usually involves a tedious trial-and-error process,and editing desired fluid behaviors is notoriously difficult to predict and control.To address these problems,we propose an adaptive multilayer external force guiding model that alleviates the challenging parameter tuning and satisfies user-defined requirements.External forces cause the effect of target particles on fluid particles.The adaptive multilayer scheme makes the whole 3D fluid volume subject to the shape and motion of the water captured by the input video or designed by users.Therefore,we can avoid the tedious and laborious parameter tuning and easily balance the smoothness of fluid volume and the details of the water surface.Simultaneously,to vividly reproduce the inflow and outflow of the video scene,we construct a generation and extinction model to add or delete fluid particles according to the three-dimensional velocity field of target particles calculated using a hybrid model coupling shape-from-shading with optical flow.Besides,we edit fluids by subtly extracting features selected by users using the off-screen rendering method and seamlessly integrating them using the dynamic weight approach.Experiments show that our approach is comparable to the state-of-the-art reconstruction quality and is remarkably convenient in authoring flows by editing fluids.Furthermore,our results can be effectively applied to any desired new scenario.

关 键 词：reconstructing fluids editing fluids monocular videos adaptive multilayer external force guiding model generation and extinction model 

分 类 号：O35[理学—流体力学]