We propose a new methodology to analyze the anatomical variability of a set of longitudinal data (population scanned at several ages). This method accounts not only for the usual 3D anatomical variability (geometry of structures), but also for possible changes in the dynamics of evolution of the structures. It does not require that subjects are scanned the same number of times or at the same ag...

The Delaunay edge-flip algorithm is a practical method for transforming any existing triangular mesh S into a mesh T (S) that satisfies the Delaunay condition. Although several implementations of this algorithm are known, to the best of our knowledge no parallel GPU-based implementation has been reported yet. In the present work, we propose a quadriphasic and iterative GPU-based algorithm that ...

According to [2], in this paper we discuss a new method to match two 3D shapes in a geometrically consistent way. We understand a matching as a diffemorphism and want to find the matching that minimizes the physical energy that is necessary to deform one shape into the other. Because of the fact that diffeomorphisms can be completely characterized by their graph, we propose an equivalent formul...

Modeling free-form shapes in a 3D space is one of the difficult problems in computer graphics. In a parametric patch, intuitive control of free-form shapes is not easy. Modeling methods based on strict physical laws need considerable computation time to deform objects, which are not suitable for interactive applications. In this paper we focus on a cellular automaton and try to apply it to inte...

Template-based methods have been successfully used for surface detection and 3D reconstruction from a 2D input image, especially when the surface is known to deform isometrically. However, almost all such methods require that keypoint correspondences be first matched between the template and the input image. Matching thus exists as a current limitation because existing methods are either slow o...

We describe a novel interface for composition of polygonal meshes based around two artist-oriented tools: Geometry Drag-and-Drop and Mesh Clone Brush. Our drag-and-drop interface allows a complex surface part to be selected and interactively dragged to a new location. We automatically fill the hole left behind and smoothly deform the part to conform to the target surface. The artist may increas...

Meshes made from 3D points are used to represent many important geoscience concepts such as the surface of the Earth (topography), rock strata (horizons) and faults. When creating complex computer models, a geoscientist may need to directly affect the shape of such a surface to bring in in line with other data. We present a method that allows a geoscientist to precisely interact with these surf...

This paper develops an efficient, physically based shape manipulation technique. It defines a 3D model with profile curves, and uses spine curves generated from the profile curves to control the motion and global shape of 3D models. Profile and spine curves are changed into profile and spine wires by specifying proper material and geometric properties together with external forces. The underlyi...