Abstract
In this paper, we present a versatile, point handles based character skinning scheme. Point handles are easier to design and fit into an object’s volume than a skeleton. Moreover, with a conventional blending technique such as linear blending, point handles have been successfully demonstrated to handle stretching, twisting, and supple deformation, which are difficult to achieve with rigid bones. In the context of only blending, limbs, however, are not bent rigidly with point handles, limiting the space of possible deformations. To address this, we propose a method that automatically recovers the local rigidities of limbs via minimizing a surface-based, nonlinear rigidity energy. The minimization problem is subjected to the positions of a set of point handles’ proximal vertices. The positions fitting point transformations are computed by linear blend skinning, leading to speedups of the minimization in particular for large deformations. The use of nonlinear energy also allows versatile posing by intuitively selecting which point handles provide their proximal vertices on-the-fly. The degrees of freedom in modeling user constraints are reduced, and the skinning process is automated by relevant functionalities included in our scheme. The effectiveness of our scheme is demonstrated by a variety of experimental results, showing that the scheme could be an alternative to skeletal skinning.
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References
Shapira, L., Shamir, A., Cohen-Or, D.: Consistent mesh partitioning and skeletonisation using the shape diameter function. Vis. Comput. 24, 249–259 (2008)
Baran, I., Popović, J.: Automatic rigging and animation of 3d characters. ACM Trans. Graph. 26, 72 (2007)
Jacobson, A., Panozzo, D., Glauser, O., Pradalier, C., Hilliges, O., Sorkine-Hornung, O.: Tangible and modular input device for character articulation. ACM Trans. Graph. 33, 82:1–82:12 (2014)
Jacobson, A., Baran, I., Popović, J., Sorkine, O.: Bounded biharmonic weights for real-time deformation. ACM Trans. Graph. 30, 78:1–78:8 (2011)
Jacobson, A., Sorkine, O.: Stretchable and twistable bones for skeletal shape deformation. ACM Trans. Graph. 30, 165:1–165:8 (2011)
Wang, X.C., Phillips, C.: Multi-weight enveloping: least-squares approximation techniques for skin animation. In: Proceedings of the 2002 ACM SIGGRAPH/Eurographics Symposium on Computer Animation, SCA 2002, pp. 129–138 (2002)
Merry, B., Marais, P., Gain, J.: Animation space: a truly linear framework for character animation. ACM Trans. Graph. 25, 1400–1423 (2006)
Wang, R.Y., Pulli, K., Popović, J.: Real-time enveloping with rotational regression. ACM Trans. Graph. 26, 73 (2007)
Kavan, L., Collins, S., O’Sullivan, C.: Automatic linearization of nonlinear skinning. In: Proceedings of the 2009 Symposium on Interactive 3D Graphics and Games, I3D 2009, pp. 49–56 (2009)
Kavan, L., Collins, S., Žára, J., O’Sullivan, C.: Skinning with dual quaternions. In: Proceedings of the 2007 Symposium on Interactive 3D Graphics and Games, I3D 2007, pp. 39–46 (2007)
Yang, X., Somasekharan, A., Zhang, J.J.: Curve skeleton skinning for human and creature characters: research articles. Comput. Animat. Virtual Worlds 17, 281–292 (2006)
Forstmann, S., Ohya, J., Krohn-Grimberghe, A., McDougall, R.: Deformation styles for spline-based skeletal animation. In: Proceedings of the 2007 ACM SIGGRAPH/Eurographics Symposium on Computer Animation, SCA 2007, pp. 141–150 (2007)
Kavan, L., Collins, S., Žára, J., O’Sullivan, C.: Geometric skinning with approximate dual quaternion blending. ACM Trans. Graph. 27, 105:1–105:23 (2008)
Sederberg, T.W., Parry, S.R.: Free-form deformation of solid geometric models. In: Proceedings of the 13th Annual Conference on Computer Graphics and Interactive Techniques, SIGGRAPH 1986, pp. 151–160 (1986)
Ju, T., Schaefer, S., Warren, J.: Mean value coordinates for closed triangular meshes. ACM Trans. Graph. 24, 561–566 (2005)
Sorkine, O., Alexa, M.: As-rigid-as-possible surface modeling. In: Proceedings of the Fifth Eurographics Symposium on Geometry Processing, SGP 2007, pp. 109–116 (2007)
Botsch, M., Sorkine, O.: On linear variational surface deformation methods. IEEE Trans. Vis. Comput. Graph. 14, 213–230 (2008)
Sorkine, O., Cohen-Or, D., Lipman, Y., Alexa, M., Rössl, C., Seidel, H.P.: Laplacian surface editing. In: Proceedings of the 2004 Eurographics/ACM SIGGRAPH Symposium on Geometry Processing, SGP 2004, pp. 175–184 (2004)
Guennebaud, G.: Eigen: a c++ linear algebra library, version 3.0 (2011). http://eigen.tuxfamily.org/ (2011). Accessed 22 November 2014
Meyer, M., Desbrun, M., Schröder, P., Barr, A.H.: Discrete differential-geometry operators for triangulated 2-manifolds. In: Hege, H.-C., Polthier, K. (eds.) Visualization and mathematics III, pp. 35–57. Springer, Heidelberg (2003)
Kavan, L., Sloan, P.P., O’Sullivan, C.: Fast and efficient skinning of animated meshes. Comput. Graph. Forum 29, 327–336 (2010)
Jacobson, A., Baran, I., Kavan, L., Popović, J., Sorkine, O.: Fast automatic skinning transformations. ACM Trans. Graph. 31, 77:1–77:10 (2012)
Chen, X., Saparov, A., Pang, B., Funkhouser, T.: Schelling points on 3d surface meshes. ACM Trans. Graph. 31, 29:1–29:12 (2012)
Landreneau, E., Schaefer, S.: Poisson-based weight reduction of animated meshes. Comput. Graph. Forum 29, 1945–1954 (2010)
Le, B.H., Deng, Z.: Two-layer sparse compression of dense-weight blend skinning. ACM Trans. Graph. 32, 124:1–124:10 (2013)
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Luo, Z., Veltkamp, R.C., Egges, A. (2015). As-Rigid-As-Possible Character Deformation Using Point Handles. In: Bebis, G., et al. Advances in Visual Computing. ISVC 2015. Lecture Notes in Computer Science(), vol 9474. Springer, Cham. https://doi.org/10.1007/978-3-319-27857-5_6
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DOI: https://doi.org/10.1007/978-3-319-27857-5_6
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