Fabricating articulated characters from skinned meshes

Articulated deformable characters are widespread in computer animation. Unfortunately, we lack methods for their automatic fabrication using modern additive manufacturing (AM) technologies. We propose a method that takes a skinned mesh as input, then estimates a fabricatable single-material model that approximates the 3D kinematics of the corresponding virtual articulated character in a piecewise linear manner. We first extract a set of potential joint locations. From this set, together with optional, user-specified range constraints, we then estimate mechanical friction joints that satisfy inter-joint non-penetration and other fabrication constraints. To avoid brittle joint designs, we place joint centers on an approximate medial axis representation of the input geometry, and maximize each joint's minimal cross-sectional area. We provide several demonstrations, manufactured as single, assembled pieces using 3D printers.

[1]  John P. Lewis,et al.  Pose Space Deformation: A Unified Approach to Shape Interpolation and Skeleton-Driven Deformation , 2000, SIGGRAPH.

[2]  David W. Rosen,et al.  Additive Manufacturing Technologies: Rapid Prototyping to Direct Digital Manufacturing , 2009 .

[3]  Doug L. James,et al.  Skinning mesh animations , 2005, ACM Trans. Graph..

[4]  Takeo Igarashi,et al.  Converting 3D furniture models to fabricatable parts and connectors , 2011, ACM Trans. Graph..

[5]  Michael Gleicher,et al.  Building efficient, accurate character skins from examples , 2003, ACM Trans. Graph..

[6]  Jessica K. Hodgins,et al.  Pixar Animation Studios , 2003 .

[7]  M. Pauly,et al.  Discrete scale axis representations for 3D geometry , 2010, SIGGRAPH 2010.

[8]  Diego F. Nehab,et al.  Efficiently combining positions and normals for precise 3D geometry , 2005, SIGGRAPH 2005.

[9]  David W. Rosen,et al.  Development of Additive Manufacturing Technology , 2010 .

[10]  Ilya Baran,et al.  Automatic rigging and animation of 3D characters , 2007, SIGGRAPH 2007.

[11]  F. Pellacini,et al.  Fabricating spatially-varying subsurface scattering , 2010, SIGGRAPH 2010.

[12]  P. Sharma Mechanics of materials. , 2010, Technology and health care : official journal of the European Society for Engineering and Medicine.

[13]  Wojciech Matusik,et al.  Physical reproduction of materials with specified subsurface scattering , 2010, ACM Trans. Graph..

[14]  Wojciech Matusik,et al.  Design and fabrication of materials with desired deformation behavior , 2010, ACM Trans. Graph..

[15]  Chris Hecker,et al.  Real-time motion retargeting to highly varied user-created morphologies , 2008, SIGGRAPH 2008.

[16]  Jirí Zára,et al.  Geometric skinning with approximate dual quaternion blending , 2008, TOGS.

[17]  F. Durand,et al.  Procedural modeling of structurally-sound masonry buildings , 2009, SIGGRAPH 2009.

[18]  Tim Weyrich,et al.  Fabricating microgeometry for custom surface reflectance , 2009, SIGGRAPH 2009.

[19]  Dinesh K. Pai,et al.  EigenSkin: real time large deformation character skinning in hardware , 2002, SCA '02.

[20]  Wojciech Matusik,et al.  Printing spatially-varying reflectance , 2009, SIGGRAPH 2009.