| Adaptive Faceting |
| List of: | Discussion Topic | |
| Subjects: | Faceting | |
| Contents: | Faceter | |
| Because ACIS supports various types of geometric representation (e.g., planar, conical, toroidal, and spline surfaces), faceting relies on the curvature measurements of each faceted face to capture the underlying geometry. All types of surface geometry, except spline, can be well approximated with a regular grid whose lines are equidistant in parameter space. However, due to their intrinsic free-form nature, spline surfaces necessitate a different approach. | |||||
| Adaptive faceting is employed to lay a grid of non-equidistant lines, rather than a regular grid, for spline surfaces. The nonregular grid is based on the curvature computation of the spline surface at some parameter space sampling locations. Sampled curvature distribution controls the density of grid lines in the parameter space. Higher curvature areas get a greater number of grid lines, while lower curvature areas get fewer lines. In all cases, faceting tries to satisfy the refinement criteria set by the application. | |||||
| The adaptive faceting algorithm now subdivides internal triangles according to the specified refinements in the case of faceting a body with triangles when no uv grid was selected. | |||||