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Extra info for Advances in computer graphics and computer vision : international conferences, VISAPP and GRAPP 2006, Setúbal, Portugal, February 25-28, 2006 : revised selected papers

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Ma | (6) It sometimes happens that merging two arcs in Ma does not form a contiguous patch. Thus, for these patches at least 2 triangle strips have to be used, so that there would be 38 M. Holst and H. Schumann (a) original 7512 patches (b) av. patch size 5 3575 patches (c) av. patch size 10 1941 patches (d) av. patch size 20 1018 patches Fig. 6. Rendering of the same LOD of the Armadillo model with different average patch sizes (each patch is differently colored) no benefit in the number of processed vertices.

For angles in the ranges [0, π ) and (π , 2π ] we create varying radial curvature inflection points (Fig. , 2003) such as the cheekbone shown in Fig. 21. Note that these inflection points are not necessarily directly under the sketch, since they result from the Laplacian surface reconstruction and the boundary constraints around the ROI. 0 GHz computer. The main computational core of the surface reconstruction algorithm is solving a sparse linear least-squares problem. We use a direct solver which first computes a sparse triangular factorization of the normal equations and then finds the minimizer by back-substitution.

After collapsing arc a the monotonic bottom-up increase of simplification errors is broken To achieve a specific average patch size our procedure is as follows: All arcs are ordered in a priority queue, starting with the smallest weight. Then, iteratively, the arc at the head of this queue is collapsed (if it does not produce a cycle, of course). During this, weights of the in- and outgoing arcs of the merged nodes are updated. We stop collapsing arcs if the desired average patch size is reached (or if there is only one arc left in the hierarchy).

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