Computational geometry: an introduction
Computational geometry: an introduction
Tangent, normal, and visibility cones on Be´zier surfaces
Computer Aided Geometric Design
Computational geometry in C (2nd ed.)
Computational geometry in C (2nd ed.)
Computer Graphics and Geometric Modeling for Engineers
Computer Graphics and Geometric Modeling for Engineers
Accessibility Analysis Using Computer Graphics Hardware
IEEE Transactions on Visualization and Computer Graphics
Mold Accessibility via Gauss Map Analysis
SMI '04 Proceedings of the Shape Modeling International 2004
Computational Geometry: Algorithms and Applications
Computational Geometry: Algorithms and Applications
Finding feasible mold parting directions using graphics hardware
Computer-Aided Design
Computer-Aided Design
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Global accessibility information of a CAD model has been utilized widely in various manufacturing applications. This information needs fast-computing to improve the efficiency of manufacturability analysis. It needs compact representation to increase the effective utilization in its process-planning task. We propose a new geometric algorithm to explicitly find the global accessibility cones (GAC) of a polyhedral model. The proposed algorithm has three main steps. The first is concave region extraction, collecting facets that are not on the convex hull of the entire model. Second, inaccessibility of convex polygonal facets in these concave regions is analyzed in order to find their inaccessibility cones (IAC). The method is done in 2D instead of 3D. Finally, to compute GACs of those facets, the complement of the IACs union is determined for an exact solution, while the slicing-method is proposed to find a near-exact solution. In this paper, geometric examples are demonstrated and a comparison of the computational complexity with existing algorithms is provided.