Artistic simulation of curly hair

Iben, Hayley N.; Meyer, Mark; Petrović, Lena; Soares, Olivier; Anderson, John R.; Witkin, Andrew

doi:10.1145/2485895.2485913

Cited by 36 publications

(17 citation statements)

References 24 publications

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“…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. 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.…”

Section: Related Workmentioning

confidence: 99%

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: Related Workmentioning

confidence: 99%

A multi-scale model for simulating liquid-hair interactions

et al. 2017

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“…Kubiak et al (2007) evaluate the amount of torque using torsion angle -the angle difference between the material frame and the Bishop frame associated with the thread ( Bishop, 1975 ); and the bending stiffness of each point is measured through the bending springs connecting its two adjacent neighbor points. Other approaches based on a mass-spring model ( Nakajima et al, 1999;Bertails et al, 2003;Ward and Lin, 20 03;Choe et al, 20 05;Iben et al, 2013;Michels et al, 2015 ) have been developed to simulate hair in the past. Mass-spring systems have the advantage of being easy to implement, computationally efficient and well suited to parallel computing, which makes realtime animations possible.…”

Section: Physical Based Simulationsmentioning

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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“…Later, Selle et al [9] augmented the mass-spring model to handle torsion and stretch-limiting for improved realism. More recently, Iben et al [10] addressed the needs for artistic control in spring-mass hair simulation, and demonstrated its efficacy in production of feature films. To accurately model hair strands' nonlinear bending and twisting deformations, Kirchhoff rods [11] has been introduced in graphics simulation [12].…”

Section: Prior Workmentioning

confidence: 99%

“…for each G ⊆ G and G = ∅ in ascending order of |G | do 4: for each guide hair g ∈ G do 5: Estimate coefficients of w g→s (i) in (6) Section 6.2 6: if max w g→s < ε then 7: goto next_set Skip this guide hair set 8: end if 9: end for 10:…”

Section: Algorithm 2 Precomputation Of Skinning For a Normal Hairmentioning

confidence: 99%

Adaptive Skinning for Interactive Hair-Solid Simulation

Chai

Zheng

Zhou

2017

IEEE Trans. Visual. Comput. Graphics

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Reduced hair models have proven successful for interactively simulating a full head of hair strands, building upon a fundamental assumption that only a small set of guide hairs are needed for explicit simulation, and the rest of the hair move coherently and thus can be interpolated using guide hairs. Unfortunately, hair-solid interactions is a pathological case for traditional reduced hair models, as the motion coherence between hair strands can be arbitrarily broken by interacting with solids. In this paper, we propose an adaptive hair skinning method for interactive hair simulation with hair-solid collisions. We precompute many eligible sets of guide hairs and the corresponding interpolation relationships that are represented using a compact strand-based hair skinning model. At runtime, we simulate only guide hairs; for interpolating every other hair, we adaptively choose its guide hairs, taking into account motion coherence and potential hair-solid collisions. Further, we introduce a two-way collision correction algorithm to allow sparsely sampled guide hairs to resolve collisions with solids that can have small geometric features. Our method enables interactive simulation of more than 150 K hair strands interacting with complex solid objects, using 400 guide hairs. We demonstrate the efficiency and robustness of the method with various hairstyles and user-controlled arbitrary hair-solid interactions.

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Artistic simulation of curly hair

Cited by 36 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

Adaptive Skinning for Interactive Hair-Solid Simulation

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