ABSTRACT This paper presents a cage‐based inverse kinematics (CageIK) that enables interactive posing of character models in a wide range of mesh representations using handle points. By providing a set of cage geometries as examples, CageIK optimizes deformations of the cage according to handle movements and reconstructs the model using a subspace deformation method based on Green Coordinates. CageIK therefore not only poses the model naturally but also preserves details even when leaving the example space. Furthermore, by blending deformations based on bounded biharmonic weights, CageIK can edit the pose of the model locally. Because example cages can be generated from existing models, we can reuse animation assets that were already created by artists or simulations, which avoids repeating the time‐consuming process of creating examples. We show that CageIK can edit a wide variety of models, including multicomponent meshes, polygon soups, and quadrilateral meshes. Copyright © 2012 John Wiley & Sons, Ltd.

ABSTRACT In this paper, we propose a deformation transfer method that is applicable to multi‐component objects and is able to transfer fine‐scale deformations. To accomplish our goal, we combine surface‐based and space‐based deformation transfers. Our system enhances the result of space deformation transfer, which is applicable to multi‐component objects but loses details, by using surface‐based deformation transfer to add fine‐scale deformations. Self‐collisions are handled by approximating spatial relationships between surfaces, from the result of space deformation. Experimental results show that our method can transfer fine‐scale deformations such as motions of a skirt and muscle bulging. Copyright © 2012 John Wiley & Sons, Ltd.

In this paper, we present a novel technique that enables capturing of detailed 3D models from flash photographs integrating shading and silhouette cues. Our main contribution is an optimization framework which not only captures subtle surface details but also handles changes in topology. To incorporate normals estimated from shading, we employ a mesh-based deformable model using deformation gradient. This method is capable of manipulating precise geometry and, in fact, it outperforms previous methods in terms of both accuracy and efficiency. To adapt the topology of the mesh, we convert the mesh into an implicit surface representation and then back to a mesh representation. This simple procedure removes self-intersecting regions of the mesh and solves the topology problem effectively. In addition to the algorithm, we introduce a hand-held setup to achieve multi-view photometric stereo. The key idea is to acquire flash photographs from a wide range of positions in order to obtain a sufficient lighting variation even with a standard flash unit attached to the camera. Experimental results showed that our method can capture detailed shapes of various objects and cope with topology changes well.

Pose space deformation (PSD) is a method for creating a shape from example meshes [Lewis et al. 2000; Weber et al. 2007]. This is thought of as a combination of the skeletal-subspace deformation (SSD) and the shape interpolation (morphing). In PSD, a base mesh is first computed by SSD. This is then corrected by adding displacements computed from examples. To interpolate displacement vectors, example meshes must be transformed back to the rest pose by SSD to store the displacements in a rotation-invariant manner.