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Surface design using hand motion with smoothing
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DOI：10.1016/S0010-4485(00)00130-5.png)
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Abstract
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We describe elements used in a system to manipulate a polygon-based surface object using a data glove (made by Fifth Dimension Inc.). A direct-manipulation method is used that allows for placing new displacements on previous ones. Good results are obtained for manipulation at any incidence angle to the surface by using a new linear transformation on the selected vertices, in order to properly calculate their displacement magnitudes. The design of the manipulation system emphasizes intuitiveness and speed. A method for smoothing selected portions of the object is also presented. The smoothing tool does not change regions of the surface where vertex coordinates may be expressed as a second-order implicit function i.e, the method has quadratic precision. It operates by finding a least-squares fit, followed by a relaxation phase where vertices are moved near the surface approximation. The smoother operates on a set of disjoint points in space, no knowledge of connectivity is required by the surface smoother. (C) 2001 Elsevier Science Ltd. All rights reserved.
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