Locator the image coordinate system. The Reference X and Reference Y coordinates of the point are expressed in pixels. l World Distance orders instances according to their proximity to a user-defined point in the World coordinate system. The Reference X and Reference Y coordinates of the point are expressed in the user-selected length units. l Shading Consistency orders instances according to the custom shading area created in the model. If no Custom Shading Area is defined in the model, the Locator uses the entire model area for shading analysis.
This mode is useful when the shading information, in addition to the normal contour inform- ation, can assist in discriminating between very similar hypotheses. This is a requirement for color processing of models and also often used for BGA application, as illustrated in the fol- lowing figure. Instance Ordering - Shading Consistency Output Symmetric Instances The Output Symmetric Instances setting determines how the Locator will handle sym- metrical or nearly symmetrical objects. l When set to false, the search process will output only the first best quality instance of a symmetric object.
l When set to true, the search process will output the results for all possible symmetries of a symmetric object. This can significantly increase execution time when there are many possible symmetries of an object, for example, if the object is circular. Timeout The Timeout setting controls the elapsed time after which the Locator aborts its search pro- cess. This timeout period does not include the model learning phase. When the Timeout is ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 573