Adaptive nonlinearity for collisions in complex rod assemblies

Kaufman, Danny M.; Tamstorf, Rasmus; Smith, Breannan; Aubry, Jean‐Marie; Grinspun, Eitan

doi:10.1145/2601097.2601100

Cited by 63 publications

(50 citation statements)

References 24 publications

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“…Compared with the same elastic rod model by Kaufman et al [2014], our linearized solver suffers less cost per time step, although it also requires smaller time steps for the stiff repulsive/cohesive constraints between hairs. Overall the cost of our hair dynamics are comparable with the dry contact timings reported in prior work that handles per-strand collisions.…”

Section: Discussion Of Limitations and Future Workmentioning

confidence: 99%

“…A survey of earlier hair simulation work can be found in the reviews by and Hadap et al [2007]. More recently, several works have aimed towards making hair inextensible [Han and Harada 2013;Müller et al 2012], or combining position based dynamics [Kugelstadt and Schömer 2016] with the discrete elastic rods (DER) framework [Bergou et al 2010[Bergou et al , 2008Kaufman et al 2014]. Additionally, Iben et al [2013] proposed an artistic way to control curly hairs.…”

Section: Related Workmentioning

confidence: 99%

“…Additionally, Iben et al [2013] proposed an artistic way to control curly hairs. As for collision between hairs, Kaufman et al [2014] combined a nonlinear integrator with a Gauss-Seidel collision solver, while Gornowicz and Borac [2015] proposed a hybrid algorithm for higher performance and better stability. To simulate the underlying dynamics of hair, we adopt the DER framework, and model both the cohesive and repulsive effects as constraints.…”

Section: Related Workmentioning

confidence: 99%

“…We solve them with a stable constraint solver [Tournier et al 2015] alongside a modified conjugate gradient preconditioner. We choose such an implementation for simplicity, although we believe more sophisticated integrators or constraint solvers [Gornowicz and Borac 2015;Kaufman et al 2014] could also be applied for the constraints proposed in this paper.…”

Section: Related Workmentioning

confidence: 99%

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A multi-scale model for simulating liquid-hair interactions

et al. 2017

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Fig. 1. Hair is submerged in water and then rapidly flipped, resulting in wet locks and dripping.The diverse interactions between hair and liquid are complex and span multiple length scales, yet are central to the appearance of humans and animals in many situations. We therefore propose a novel multi-component simulation framework that treats many of the key physical mechanisms governing the dynamics of wet hair. The foundations of our approach are a discrete rod model for hair and a particle-in-cell model for fluids. To treat the thin layer of liquid that clings to the hair, we augment each hair strand with a height field representation. Our contribution is to develop the necessary physical and numerical models to evolve this new system and the interactions among its components. We develop a new reduced-dimensional liquid model to solve the motion of the liquid along the length of each hair, while accounting for its moving reference frame and influence on the hair dynamics. We derive a faithful model for surface tension-induced cohesion effects between adjacent hairs, based on the geometry of the liquid bridges that connect them. We adopt an empirically-validated drag model to treat the effects of coarse-scale interactions between hair and surrounding fluid, and propose new volume-conserving dripping and absorption strategies to transfer liquid between the reduced and particle-in-cell liquid representations. The synthesis of these techniques yields an effective wet hair simulator, which we use to animate hair flipping, an animal shaking itself dry, a spinning car wash roller brush dunked in liquid, and intricate hair coalescence effects, among several additional scenarios.

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Section: Discussion Of Limitations and Future Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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A multi-scale model for simulating liquid-hair interactions

et al. 2017

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“…This is a difficult problem for one dimensional models (with zero thickness) since, within a single time step a portion of the rod can pass through a different portion and collisions or interpenetration may not be detected at all. This collision of portions of the thread with itself raises difficulties in collision detection and response ( Akutsu and Wadati, 1988;Kaufman et al, 2014 ).…”

Section: Simulation Of Plectoneme Formation and Tying Knotmentioning

confidence: 99%

Real time simulation of inextensible surgical thread using a Kirchhoff rod model with force output for haptic feedback applications

Wang

Fratarcangeli

Ruimi

et al. 2017

International Journal of Solids and Structures

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International Journal of Solids and Structures (ISSN: 0020-7683)Citation for the published paper: Wang, Z. ; Fratarcangeli, M. ; Ruimi, A. et al. (2017) "Real time simulation of inextensible surgical thread using a Kirchhoff rod model with force output for haptic feedback applications". International Journal of Solids and Structures, http://dx.doi.org/10.1016/j.ijsolstr.2017.02.017Downloaded from: http://publications.lib.chalmers.se/publication/248860 Notice: Changes introduced as a result of publishing processes such as copy-editing and formatting may not be reflected in this document. For a definitive version of this work, please refer to the published source. Please note that access to the published version might require a subscription.Chalmers Publication Library (CPL) offers the possibility of retrieving research publications produced at Chalmers University of Technology. It covers all types of publications: articles, dissertations, licentiate theses, masters theses, conference papers, reports etc. Since 2006 it is the official tool for Chalmers official publication statistics. To ensure that Chalmers research results are disseminated as widely as possible, an Open Access Policy has been adopted. The CPL service is administrated and maintained by Chalmers Library.(article starts on next page)International Journal of Solids and Structures 113-114 (2017) 192-208 Contents lists available at ScienceDirect a b s t r a c tWe discuss the dynamics of an inextensible thin Kirchhoff rod used in the modeling of surgical threads, and demonstrate a very efficient scheme to not only simulate the motion of the thread in real-time (up to 1 ms per frame) but also obtain the constraint axial forces which can be fed back to a haptic system. The numerical scheme is based on a family of schemes called geometric or discrete variational integrators guaranteeing that the momentum and energy are exactly conserved over long periods of time for conservative systems. Besides, we report on an efficient numerical procedure to handle the inextensibility of the thread through physically based Lagrange multipliers, as well as the internal dissipation of the thread. We have performed simulations to verify the capabilities of our model to conserve momentum and energy, accurately calculate the axial constraint forces along the thread for haptic feedback, and capture bending-torsion coupling leading to the formation of plectonemes. While many of the ideas are well known in the computer graphics community (especially in hair modeling), we have implemented several improvements for the specific purpose of speeding up the computations for developing physically based haptic interfaces for knot tying and suturing.

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Incorporating particle motion into an ADF for fast coupling of fluids with rigid and deformable solids

Kim

Lee

2016

Computer Animation & Virtual

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We present a new method for the fast simulation of interactions between fluids and solids by incorporating particle-based water flow into an adaptive signed distance field. In some previous methods, the motion of every water particle is checked when simulating the collision with the solid in the coupling process, and the computational cost becomes very great as the number of particles increases. If only the particles on the leaf nodes surrounding the solid are considered, this reduces the computational cost of collision detection, but some collisions may not be detected. This may lead to the "tunneling" artifact, in which particles with high velocities skip across the layer of leaf nodes. This paper addresses the problem by (i) considering particles only on the leaf nodes in the adaptive structure to improve the processing time required for the water-solid coupling and (ii) considering the water flow to avoid the tunneling artifact by incorporating particle motion into the tree structure of the adaptive signed distance field. Our method can be computed in parallel, and experimental results show that it outperforms previous methods while producing animations that are largely free of artifacts. Copyright

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Adaptive nonlinearity for collisions in complex rod assemblies

Cited by 63 publications

References 24 publications

A multi-scale model for simulating liquid-hair interactions

A multi-scale model for simulating liquid-hair interactions

Real time simulation of inextensible surgical thread using a Kirchhoff rod model with force output for haptic feedback applications

Incorporating particle motion into an ADF for fast coupling of fluids with rigid and deformable solids

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