Automated generation of control skeletons for use in animation

Wade, Lawson; Parent, Rick

doi:10.1007/s003710100139

Cited by 77 publications

(49 citation statements)

References 12 publications

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“…Alternatively, we could have used a method for automatic skeleton creation [Wade and Parent 2002;Baran and Popović 2007], however, this was outside the scope of our work. Once skeletons were defined, we used our method to calculate skinning weights for each set of input meshes/skeletons.…”

Section: Resultsmentioning

confidence: 99%

“…Our voxelization algorithm will benefit numerous applications including collision detection, CSG modeling, fluid simulation [Crane et al 2008], model simplification [Nooruddin and Turk 2003], or could be used to automatically extract skeletons, as part of a complete auto-rigging systems [Wade and Parent 2002]. Our method is also complementary to the recent subspace energy minimization method of Jacobson and colleagues [2012] which requires initial weights to be specified for a small number of skeleton bones.…”

Section: Discussionmentioning

confidence: 99%

“…Katz and Tal [2003] propose a resolution-dependent mesh segmentation strategy that can be applied to skinning. Wade and Parent [2002] use voxelization to extract a skeleton but resulting weights do not vary smoothly, causing artifacts on highresolution meshes. Baran and Popović [2007] compute skinning weights by formulating a linear system based on equilibrium heat equations over the mesh surface.…”

Section: Related Workmentioning

confidence: 99%

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Geodesic voxel binding for production character meshes

Dionne

Lasa

2013

Proceedings of the 12th ACM SIGGRAPH/Eurographics Symposium on Computer Animation

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Figure 1: Starting from a character skeleton and mesh (A), which may contain degenerate geometry (in red) (B), we voxelize the mesh using graphics hardware (C), and compute bind weights using geodesic distances from each bone (D). Resulting weights are applied to existing closed-form skinning methods to deform character geometry (E). AbstractWe propose a fully automatic method for specifying influence weights for closed-form skinning methods, such as linear blend skinning. Our method is designed to work with production meshes that may contain non-manifold geometry, be non-watertight, have intersecting triangles, or be comprise of multiple connected components. Starting from a character rest pose mesh and skeleton hierarchy, we first voxelize the input geometry. The resulting voxelization is then used to calculate binding weights, based on the geodesic distance between each voxel lying on a skeleton "bone" and all non-exterior voxels. This yields smooth weights at interactive rates, without time-constants, iteration parameters, or costly optimization at bind or pose time. By decoupling weight assignment from distance computation we make it possible to modify weights interactively, at pose time, without additional pre-processing or computation. This allows artists to assess impact of weight selection in the context in which they are used.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Geodesic voxel binding for production character meshes

Dionne

Lasa

2013

Proceedings of the 12th ACM SIGGRAPH/Eurographics Symposium on Computer Animation

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“…Previous methods are either mesh resolution dependent [Katz and Tal 2003] or the weights do not vary smoothly along the surface [Wade 2000], causing artifacts on highresolution meshes. Some commercial packages use proprietary methods to assign default weights.…”

Section: Skeleton Extractionmentioning

confidence: 99%

Automatic rigging and animation of 3D characters

2007

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Animating an articulated 3D character currently requires manual rigging to specify its internal skeletal structure and to define how the input motion deforms its surface. We present a method for animating characters automatically. Given a static character mesh and a generic skeleton, our method adapts the skeleton to the character and attaches it to the surface, allowing skeletal motion data to animate the character. Because a single skeleton can be used with a wide range of characters, our method, in conjunction with a library of motions for a few skeletons, enables a user-friendly animation system for novices and children. Our prototype implementation, called Pinocchio, typically takes under a minute to rig a character on a modern midrange PC.

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“…The algorithm of Wade and Parent, described in [23] and extended in [24], uses a subset of the DMS to generate a skeleton. The algorithm involves voxelization of the polygonal model, and computation of an approximate discrete Euclidean distance transform.…”

Section: Previous Workmentioning

confidence: 99%

Virtual Woodwork: Making Toys From Geometric Models

Raab

Gotsman

Sheffer

2004

Int. J. Shape Model.

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Shape idealization techniques provide a simplified description of a geometric model. Idealized descriptions are useful for recognition, animation, and other applications, providing a compact and efficient alternative to manipulating the complete model. Often idealized models are visually interesting in their own right and provide an appealing artistic impression of the models.We describe an algorithm for automatic generation of idealized bead figures from recognizable 3D models (animals, humans, etc.). The bead figures approximate the model by a set of cylindrical shapes threaded onto a skeleton of the model. As such, they provide volumetric shape information in addition to the skeleton. The bead figures can be used by applications requiring a simple and compact description of the shapes. They also provide a visually appealing, toy-like description which can be used in artistic applications. The input models are given as 3D triangulated meshes. A bead figure is generated using the skeleton of the model, often referred to as the "stick figure". The skeleton reflects the structure of the original mesh and its features, using a small number of edges. Once the skeleton is computed, beads are threaded onto it to create the final model. Computation of a compact and concise skeleton which captures the features of the model is crucial for realistic bead figure generation.The figure making process involves voxelization of the model; computation of the 3D Euclidean distance transform (DT); extraction of the skeleton from the DT data (combined with the model's curvature information); and threading the beads over the skeleton.In addition to the generation of the beaded figures, our work also introduces a novel skeleton construction algorithm. The algorithm has several advantages over existing methods and may be used in other applications which utilize skeletons.

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Automated generation of control skeletons for use in animation

Cited by 77 publications

References 12 publications

Geodesic voxel binding for production character meshes

Geodesic voxel binding for production character meshes

Automatic rigging and animation of 3D characters

Virtual Woodwork: Making Toys From Geometric Models

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