AreaCentroid calculates the area centroid of surfaces, for both open and closed surfaces.
VolumeCentroid calculates the volume centroid of closed surfaces / solids. If VolumeCentroid is used on an open surface a warning message appears. If the user proceeds it is not obvious what the result represents.
Both calculate the total centroid if multiple surfaces or solids are selected. Pascal’s script may be redundant.
For a sculpture made of a single thickness of plate the center of gravity should coincide with the area centroid. Any discrepancy in center of gravity vs area centroid should be less than the thickness of the plate.