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In this paper, we investigate the direct manipulation problem of free form deformation with rational DMS spline volume (RDMS-FFD). For the weights based direct manipulation method, the solution of the weights can be achieved by solving a linear system; for the control points based method, the explicit solution of displacements of the control points can be obtained, and some properties are also derived...
An algorithm for reducing control points in NURBS surface skinning is proposed in this paper. We first give distance estimation between the input curves and the surface that has been removed a knot. Then we further reduce the control points in NURBS surface skinning within the given tolerance by utilizing the ldquoresidual distancerdquo. Furthermore, the algorithm is applied to simplify a NURBS surface...
This paper proposes an efficient shape reconstruction method from sectional data in 3-axis Numerical Control (NC) machining. A merge-divide algorithm is proposed to construct triangle meshes for machined surfaces with arbitrary shape and genus. The algorithm is of linear complexity due to the special property of the NC data. The method is used to interference detection and space cutter compensation...
We design a type of surface icons to visualize 3-D second-order symmetric tensor fields which are tangent to two of the three orthogonal eigenvector fields and orthogonal to the third one. We use the conception of discrete normal vectors and construct a space triangular mesh to approximate the desired surface icon with the discrete normal vector parallel to the given eigenvector field at every vertex...
We present a feature and parameterization approach for constructing garment surface with garment sections from human body sections. The body section is obtained from polygonal 3D human models with the horizontal cutting plane based on detecting feature points on human model. Then we make the interstice measure which converts from garment tolerance as the parameter to build garment sections from body...
Summary form only given. In my talk I will present some surface reconstruction techniques that handle imperfect data. Such data is common in raw scans and contains large missing parts, ghost outliers and under-sampled regions. We explore reconstruction techniques that focus on such problematic regions. Our general goal is recovering the expected shape in terms of global topology and local geometric...
A trimmed surface is usually represented as a parametric surface with a set of trimming curves. However, many CAD processes and algorithms cannot be applied to trimmed surfaces directly because of the complexity in manipulating trimmed surfaces. Moreover, trimmed surfaces will create gaps between different trimmed surfaces. Thus it is desirable to represent a trimmed surface by a group of regular...
Sculpting deformation is a powerful tool to modify the shape of objects intuitively. However, the detail preserving problem has not been considered in sculpting deformation. In the deformation of a source object by pressing a primitive object against it, the source object is deformed while geometric details of the object should be maintained. In order to address this problem, we present a detail preserving...
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