“Thin skin elastodynamics” by Li, Sueda, Neog and Pai

  • ©Duo Li, Shinjiro Sueda, Debanga R. Neog, and Dinesh K. Pai

Conference:


Type:


Title:

    Thin skin elastodynamics

Presenter(s)/Author(s):


Session Title: Rods & Shells

Moderator(s):



Abstract:


    We present a novel approach for simulating thin hyperelastic skin. Real human skin is only a few millimeters thick. It can stretch and slide over underlying body structures such as muscles, bones, and tendons, revealing rich details of a moving character. Simulating such skin is challenging because it is in close contact with the body and shares its geometry. Despite major advances in simulating elastodynamics of cloth and soft bodies for computer graphics, such methods are difficult to use for simulating thin skin due to the need to deal with non-conforming meshes, collision detection, and contact response. We propose a novel Eulerian representation of skin that avoids all the difficulties of constraining the skin to lie on the body surface by working directly on the surface itself. Skin is modeled as a 2D hyperelastic membrane with arbitrary topology, which makes it easy to cover an entire character or object. Unlike most Eulerian simulations, we do not require a regular grid and can use triangular meshes to model body and skin geometry. The method is easy to implement, and can use low resolution meshes to animate high-resolution details stored in texture-like maps. Skin movement is driven by the animation of body shape prescribed by an artist or by another simulation, and so it can be easily added as a post-processing stage to an existing animation pipeline. We provide several examples simulating human and animal skin, and skin-tight clothes.

References:


    1. Albrecht, I., Haber, J., and Seidel, H.-P. 2003. Construction and animation of anatomically based human hand models. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 98–109. Google ScholarDigital Library
    2. Baraff, D., and Witkin, A. 1998. Large steps in cloth simulation. In Proc. SIGGRAPH 1998, Annual Conference Series, 43–54. Google ScholarDigital Library
    3. Bargteil, A. W., Wojtan, C., Hodgins, J. K., and Turk, G. 2007. A Finite Element Method for Animating Large Viscoplastic Flow. ACM Trans. Graph. 26, 3 (July), 16:1–16:8. Google ScholarDigital Library
    4. Beeler, T., Hahn, F., Bradley, D., Bickel, B., Beardsley, P., Gotsman, C., Sumner, R., and Gross, M. 2011. High-quality passive facial performance capture using anchor frames. ACM Trans. Graph. 30, 4 (July), 75:1–75:10. Google ScholarDigital Library
    5. Choe, B., Lee, H., and Ko, H. 2001. Performance-driven muscle-based facial animation. The Journal of Visualization and Computer Animation 12, 2, 67–79.Google ScholarCross Ref
    6. Davis, T. A. 2006. Direct Methods for Sparse Linear Systems. SIAM Book Series on the Fundamentals of Algorithms. SIAM. Google ScholarDigital Library
    7. Dong, S., Bremer, P.-T., Garland, M., Pascucci, V., and Hart, J. C. 2006. Spectral surface quadrangulation. ACM Trans. Graph. 25, 3 (July), 1057–1066. Google ScholarDigital Library
    8. Fan, Y., Levin, D. I. W., Litven, J., and Pai, D. K., 2013. Eulerian-on-Lagrangian simulation. To appear In ACM Transactions on Graphics. Google ScholarDigital Library
    9. Feldman, B. E., O’Brien, J. F., Klingner, B. M., and Goktekin, T. G. 2005. Fluids in deforming meshes. In ACM SIGGRAPH/Eurographics symposium on Computer Animation, 255–259. Google ScholarDigital Library
    10. Gourret, J.-P., Thalmann, N. M., and Thalmann, D. 1989. Simulation of object and human skin formations in a grasping task. In Computer Graphics, vol. 23, 21–30. Google ScholarDigital Library
    11. Grinspun, E., Hirani, A. N., Desbrun, M., and Schröder, P. 2003. Discrete shells. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 62–67. Google ScholarDigital Library
    12. Huang, H., Zhao, L., Yin, K., Qi, Y., Yu, Y., and Tong, X. 2011. Controllable hand deformation from sparse examples with rich details. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 73–82. Google ScholarDigital Library
    13. Irving, G., Teran, J., and Fedkiw, R. 2004. Invertible finite elements for robust simulation of large deformation. In ACM SIGGRAPH/Eurographics symposium on Computer Animation, 131–140. Google ScholarDigital Library
    14. James, D. L., and Twigg, C. D. 2005. Skinning mesh animations. ACM Trans. Graph. 24, 3 (July), 399–407. Google ScholarDigital Library
    15. Kavan, L., Collins, S., Žára, J., and O’Sullivan, C. 2008. Geometric skinning with approximate dual quaternion blending. ACM Trans. Graph. 27, 4 (Nov.), 105:1–105:23. Google ScholarDigital Library
    16. Kim, B., Liu, Y., Llamas, I., and Rossignac, J. 2005. Flowfixer: using BFECC for fluid simulation. In Proceedings of the First Eurographics conference on Natural Phenomena, 51–56. Google ScholarDigital Library
    17. Kry, P. G., James, D. L., and Pai, D. K. 2002. Eigenskin: real time large deformation character skinning in hardware. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 153–159. Google ScholarDigital Library
    18. Lee, S.-H., Sifakis, E., and Terzopoulos, D. 2009. Comprehensive biomechanical modeling and simulation of the upper body. ACM Trans. Graph. 28, 4 (Sep), 99:1–99:17. Google ScholarDigital Library
    19. Lentine, M., Aanjaneya, M., and Fedkiw, R. 2011. Mass and momentum conservation for fluid simulation. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 91–100. Google ScholarDigital Library
    20. Levin, D. I. W., Litven, J., Jones, G. L., Sueda, S., and Pai, D. K. 2011. Eulerian solid simulation with contact. ACM Trans. Graph. 30, 4 (July), 36:1–36:9. Google ScholarDigital Library
    21. Lewis, J. P., Cordner, M., and Fong, N. 2000. Pose space deformation: a unified approach to shape interpolation and skeleton-driven deformation. In Proc. SIGGRAPH 2000, Annual Conference Series, 165–172. Google ScholarDigital Library
    22. Magnenat-Thalmann, N., Laperrire, R., Thalmann, D., and Montral, U. D. 1988. Joint-dependent local deformations for hand animation and object grasping. In In Proceedings on Graphics interface 88, 26–33. Google ScholarDigital Library
    23. Maillot, J., Yahia, H., and Verroust, A. 1993. Interactive texture mapping. In Proc. SIGGRAPH 1993, Annual Conference Series, 27–34. Google ScholarDigital Library
    24. McAdams, A., Zhu, Y., Selle, A., Empey, M., Tamstorf, R., Teran, J., and Sifakis, E. 2011. Efficient elasticity for character skinning with contact and collisions. ACM Trans. Graph. 30, 4 (July), 37:1–37:12. Google ScholarDigital Library
    25. Mohr, A., and Gleicher, M. 2003. Building efficient, accurate character skins from examples. ACM Trans. Graph. 22, 3 (July), 562–568. Google ScholarDigital Library
    26. Monagan, M. B., Geddes, K. O., Heal, K. M., Labahn, G., Vorkoetter, S. M., McCarron, J., and DeMarco, P. 2005. Maple 10 Programming Guide. Maplesoft, Waterloo ON, Canada.Google Scholar
    27. Park, S. I., and Hodgins, J. K. 2006. Capturing and animating skin deformation in human motion. ACM Trans. Graph. 25, 3 (July), 881–889. Google ScholarDigital Library
    28. Qin, H., and Terzopoulos, D. 1996. D-NURBS: A Physics-Based Framework for Geometric Design. IEEE Transactions on Visualization and Computer Graphics 2, 1, 85–96. Google ScholarDigital Library
    29. Rohmer, D., Popa, T., Cani, M.-P., Hahmann, S., and Sheffer, A. 2010. Animation wrinkling: augmenting coarse cloth simulations with realistic-looking wrinkles. ACM Trans. Graph. 29, 6 (Dec.), 157:1–157:8. Google ScholarDigital Library
    30. Selle, A., Fedkiw, R., Kim, B., Liu, Y., and Rossignac, J. 2008. An unconditionally stable maccormack method. J. Sci. Comput. 35, 2–3 (June), 350–371. Google ScholarDigital Library
    31. Sheffer, A., Praun, E., and Rose, K. 2006. Mesh parameterization methods and their applications. Found. Trends. Comput. Graph. Vis. 2, 2 (Jan.), 105–171. Google ScholarDigital Library
    32. Sifakis, E., Neverov, I., and Fedkiw, R. 2005. Automatic determination of facial muscle activations from sparse motion capture marker data. ACM Trans. Graph. 24, 3 (July), 417–425. Google ScholarDigital Library
    33. Sifakis, E., Hellrung, J., Teran, J., Oliker, A., and Cutting, C. 2009. Local flaps: A real-time finite element based solution to the plastic surgery defect puzzle. Studies in Health Technology and Informatics 142, 313–8.Google Scholar
    34. Stam, J. 1999. Stable fluids. In Proc. SIGGRAPH 1999, Annual Conference Series, 121–128. Google ScholarDigital Library
    35. Stam, J. 2003. Flows on surfaces of arbitrary topology. ACM Trans. Graph. 22, 3 (July), 724–731. Google ScholarDigital Library
    36. Sueda, S., Kaufman, A., and Pai, D. K. 2008. Musculotendon simulation for hand animation. ACM Trans. Graph. 27, 3 (Aug.), 83:1–83:8. Google ScholarDigital Library
    37. Sueda, S., Jones, G. L., Levin, D. I. W., and Pai, D. K. 2011. Large-scale dynamic simulation of highly constrained strands. ACM Trans. Graph. 30, 4 (July), 39:1–39:9. Google ScholarDigital Library
    38. Teran, J., Blemker, S., Hing, V. N. T., and Fedkiw, R. 2003. Finite volume methods for the simulation of skeletal muscle. In ACM SIGGRAPH/Eurographics Symposium on Computer Animation, 68–74. Google ScholarDigital Library
    39. Terzopoulos, D., and Waters, K. 1990. Physically-based facial modelling, analysis, and animation. The Journal of Visualization and Computer Animation 1, 2 (Dec.), 73–80.Google ScholarCross Ref
    40. Volino, P., Magnenat-Thalmann, N., and Faure, F. 2009. A simple approach to nonlinear tensile stiffness for accurate cloth simulation. ACM Trans. Graph. 28, 4 (Sept.), 105:1–105:16. Google ScholarDigital Library
    41. Wicke, M., Ritchie, D., Klingner, B. M., Burke, S., Shewchuk, J. R., and O’Brien, J. F. 2010. Dynamic local remeshing for elastoplastic simulation. ACM Trans. Graph. 29 (July), 49:1–49:11. Google ScholarDigital Library
    42. Wilhelms, J., and Gelder, A. V. 1997. Anatomically based modeling. In Proc. SIGGRAPH 1997, Annual Conference Series, 173–180. Google ScholarDigital Library
    43. Wu, Y., Kalra, P., and Thalmann, N. 1996. Simulation of static and dynamic wrinkles of skin. In Computer Animation’96. Proceedings, 90–97. Google ScholarDigital Library


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