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• W2022854974 abstract "Reverse Engineering (RE) requires representing with free forms (NURBS, Spline, Bézier) a real surface $$S_0$$ which has been point-sampled. To serve this purpose, we have implemented an algorithm that minimizes the accumulated distance between the free form and the (noisy) point sample. We use a dual-distance calculation point to / from surfaces, which discourages the forming of outliers and artifacts. This algorithm seeks a minimum in a function $$f$$ that represents the fitting error, by using as tuning variable the control polyhedron for the free form. The topology (rows, columns) and geometry of the control polyhedron are determined by alternative geodesic-based dimensionality reduction methods: (a) graph-approximated geodesics (Isomap), or (b) PL orthogonal geodesic grids. We assume the existence of a triangular mesh of the point sample (a reasonable expectation in current RE). A bijective composition mapping $$S_0 subset mathbb {R}^3 longleftrightarrow mathbb {R}^2$$ allows to estimate a size of the control polyhedrons favorable to uniform-speed parameterizations. Our results show that orthogonal geodesic grids is a direct and intuitive parameterization method, which requires more exploration for irregular triangle meshes. Isomap gives a usable initial parameterization whenever the graph approximation of geodesics on $$S_0$$ be faithful. These initial guesses, in turn, produce efficient free form optimization processes with minimal errors. Future work is required in further exploiting the usual triangular mesh underlying the point sample for (a) enhancing the segmentation of the point set into faces, and (b) using a more accurate approximation of the geodesic distances within $$S_0$$ , which would benefit its dimensionality reduction." @default.
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• W2022854974 date "2014-10-19" @default.
• W2022854974 modified "2023-10-10" @default.
• W2022854974 title "Geodesic-based manifold learning for parameterization of triangular meshes" @default.
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• W2022854974 doi "https://doi.org/10.1007/s12008-014-0249-9" @default.
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