If you select centroid as the reference point for a table-driven or sketch-driven pattern, the system determines the centroid based on the type of seed feature.
For cylindrical, conical, or revolved features, the centroid is the intersection of the axis of revolution with the X-Y plane of the pattern.
If the sketch consists of lines and arcs, such as rectangles or oval shapes, and if the sketch plane is parallel to the X-Y plane, the centroid is defined as the centroid of the sketch.
For any other condition, the centroid is the centroid of the face of the seed feature.
If there is more than one seed feature, the centroid of the first seed feature is used.
If the seed feature is generated from a sketch that includes multiple contours, the centroid of the largest closed contour is used.