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A regional optimization of automatically generated machining toolpaths for computer based freeform mechanical models is considered in the framework of multiaxis (3-5) machining operations. A trichotomy of an arbitrary freeform shaped surface into convex, concave and saddle-like regions is considered. Saddle-like and concave regions can be milled using a ball end tool, in 3-axis or 5-axis mode. ...
An algorithm for the interactive display of trimmed nurbs surfaces is presented. The algorithm converts the nurbs surfaces to Bezier surfaces, and nurbs trimming curves to Bezier curves. It tessellates each trimmed Bezier surface into triangles, and renders them using the triangle rendering capabilities common in current graphics systems. It makes use of tight bounds for the uniform tessellation...
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