Abstract
We present a shape control scheme for free-form solids represented in CSG as Boolean combinations of low-degree algebraic halfspaces. In this scheme, we can create manifold solids of arbitrary topology through polyhedral smoothing, and the resulting shapes may be modified by changing control points and/or control weights, with each control point and weight having a local effect. As a solid changes shape, incremental B-rep-CSG conversions are used for fast updates of the corresponding CSG representation.A key ingredient of our scheme, and a main contribution of this paper, is an algorithm that uses Kuhn-Tucker conditions to efficiently compute valid control points.
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