Pattern Locator Pattern Edition mode. 2. Enter values in the Location dialog, or use the mouse to configure the bounding box in the display. 3. To change the orientation of the pattern, rotate the X-Y axes marker or enter values in the Rotation text box. Orienting Patterns Models The Pattern Locator finds patterns that are aligned with the Pattern Locator region of interest. l The axes marker of the Pattern region of interest sets the orientation of the pattern. When the tool searches for pattern instances, it searches for only patterns with X-Y axes that are aligned with the X-Y axes of the tool region of interest.
l Only patterns that are rotated within less than ± 20 degrees can be found within the region of interest. l The following figure illustrates an example of a correctly oriented pat- tern, as well as the effect of the pattern rotation relative to the tool rota- tion on Pattern Locator results. Correct orientation of patterns models Sizing Patterns The size of the bounding box sets the size of the pattern. The bounding box should be just large enough to contain the pattern. The Pattern Locator only finds patterns that are aligned with the region of interest. l Patterns that are too large can unnecessarily increase processing time.
l Patterns that are too large can often result in false detections. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 587