Folding and crumpling adaptive sheets

Abstract

Figure 1: Crumpling a sheet of paper is a challenging process to simulate as it produces geometry with both sharp creases and smooth areas. We efficiently resolve the emerging detail in the material through adaptive remeshing. AbstractWe present a technique for simulating plastic deformation in sheets of thin materials, such as crumpled paper, dented metal, and wrinkled cloth. Our simulation uses a framework of adaptive mesh refinement to dynamically align mesh edges with folds and creases. This framework allows efficient modeling of sharp features and avoids bend locking that would be otherwise caused by stiff in-plane behavior. By using an explicit plastic embedding space we prevent remeshing from causing shape diffusion. We include several examples demonstrating that the resulting method realistically simulates the behavior of thin sheets as they fold and crumple.

View-Dependent Adaptive Cloth Simulation with Buckling Compensation

“…For scenes involving multiple characters or large crowds, these savings can be substantial. We have demonstrated our approach in simulations of clothing, but believe that it could equally well be applied to other objects that can be simulated in an adaptive framework, including materials that can crumple [15] or fracture [16].…”

“…Most relevant to our work are techniques for adaptive cloth simulation [10], [11], [12], [13], [14], which use remeshing to resolve detailed wrinkles and folds. The approach of Narain et al [14] has also been extended to efficiently model plastic deformation and sharp creases [15] as well as complex fracture patterns [16]. However, all those techniques are view-independent and element sizing is controlled only by geometrical and dynamical properties of the simulated system.…”

Data-driven finite elements for geometry and material design

“…Such methods seek to maintain an optimal number of elements and thus achieve reasonable performance. Adaptive remeshing has proven useful for simulating thin sheets such as cloth [Narain et al 2012], paper [Narain et al 2013], as well as elastoplastic solids [Wicke et al 2010] and solid-fluid mixtures [Clausen et al 2013]. More general basis refinement approaches have also been suggested [Debunne et al 2001;Grinspun et al 2002].…”

Adaptive tearing and cracking of thin sheets

“…Volumepreserving multiplicative plasticity models have been explored for volumetric meshes [Bargteil et al 2007;Wojtan and Turk 2008], but are seldom applied to sheet models. Wicke et al [2010b] introduced a plastic embedding to prevent diffusion of plasticity in volumetric materials, which was adapted to bending plasticity in sheets by Narain et al [2013]. However, for sheets with both bending and stretching plasticity their embedding approach encounters problems.…”

“…However, techniques to prevent this plasticity loss, such as plastic embedding [Wicke et al 2010a;Narain et al 2013], don't work well for combined stretching and bending plasticity. They also may produce artificial plasticity in connected regions with different plastic material parameters (Fig.…”