We present a new interpolatory subdivision scheme based on PB-splines (Point-Based B-splines), over triangular meshes. Using the stencil of the interpolatory √3-subdivision scheme, we propose a different refinement s...
详细信息
For the NURBS curve that hold the arbitrary degrees and generally structured knots, under the assumption of unchanging;he knot vector and the degree of NURBS curve, we present the constraint conditions for elevating t...
详细信息
ISBN:
(纸本)0769524737
For the NURBS curve that hold the arbitrary degrees and generally structured knots, under the assumption of unchanging;he knot vector and the degree of NURBS curve, we present the constraint conditions for elevating the parametric continuity order of NURBS curve at the interior knots by modifying their control points and weights. Meanwhile, we obtain the freedom degree of the control points and the weights when the parametric continuity order of NURBS curve elevates by one. Furthermore, we obtain the conditions for elevating the parametric continuity order of NURBS surface along its iso-parametric line by modifying their control points and weights. Meanwhile, the freedom degree of the control points and the weights when the parametric continuity order of NURBS surface elevates by one is presented at the end.
We describe the rendering of massive volumes on a volume visualization cluster We present our data distribution scheme and introduce an algorithm which reduces the memory requirement with no loss of accuracy. the volu...
详细信息
ISBN:
(纸本)0769524737
We describe the rendering of massive volumes on a volume visualization cluster We present our data distribution scheme and introduce an algorithm which reduces the memory requirement with no loss of accuracy. the volume is automatically cropped and partitioned into small volume blocks. the bounding boxes of these volume blocks are used at run-time for flexible partitioning of the volume across the network. We present results of rendering the full Visible Male color dataset, seismic data, and several large micro-CT scanned fossil and teeth datasets.
Mesh-free deformation is an effective method for the simulation of deformable objects and characters in computer animation. It bears the merits of flexible control, good accuracy and easy implementation. Similar to ot...
详细信息
ISBN:
(纸本)0769524737
Mesh-free deformation is an effective method for the simulation of deformable objects and characters in computer animation. It bears the merits of flexible control, good accuracy and easy implementation. Similar to other physically-based deformation techniques, however, computational cost remains a pressing issue, especially for large scale problems. Based on our previous work, in this paper we investigate the underlying structure of the numerical approach in order to speed up the computation. three algorithms are presented and their efficiency and convergence are analysed Our results show that we are able to significantly reduce the computation time and memory usage with little loss in accuracy. the new technique is capable of achieving interactive frame rates with large models.
Based on the smoothness criterion of minimum curvature variation of the curve, tangent angle constraints guaranteeing an optimized geometric Hermite (OGH) curve both mathematically and geometrically smooth is given, a...
详细信息
In this paper, we conducted some well chosen experimental tests to determine what order is sufficient for Taylor model applied in subdivision based implicit curve plotting algorithm. Test results show that order 1 is ...
详细信息
In this paper, we present a new approach to detecting, locating and visualizing the local bifurcations originated from the changes of critical points in a 2D time-dependent vector field. Via precisely tracking the cha...
详细信息
One problem in subdivision surfaces is the number of facets grows exponentially withthe level of subdivision. Subdivision schemes are cost intensive at higher levels of subdivision. In this paper, we propose an adapt...
详细信息
In this paper we present a new adaptive rendering method for general Catmull-Clark subdivision surfaces. the new method is based on direct evaluation of the limit surface to generate an inscribed polyhedron of the lim...
详细信息
ISBN:
(纸本)0769524737
In this paper we present a new adaptive rendering method for general Catmull-Clark subdivision surfaces. the new method is based on direct evaluation of the limit surface to generate an inscribed polyhedron of the limit surface. the method generates less polygons in the filial rendering process because inscribed approximation usually provides faster convergent rate than circumscribed approximation. the new adaptive rendering method call precisely measure error for every point of the limit surface. Hence, it has complete control of the accuracy of the rendering result. Cracks are avoided by using a recursive marking process to ensure that adjacent patches or subpatches use the same limit surface points in the construction of the shared boundary. the new method performs limit surface evaluation only at points that are needed for the filial rendering process. therefore it is very fast and memory efficient.
Information security and assurance are emerging frontiers for collaborative design. the collaborative assembly design becomes one style of cooperation in bothdesign and the outsourcing manufacture. However, during th...
详细信息
暂无评论