I have stumbled upon a large problem in a script I am currently writing.
The routine basically checks for overlapping layers - it does this by copying a reference polygon to a region and doing a series of subtractions to work out how much (if any) of the polygon overlaps another one.
The script works perfectly if the reference polygon is contained completely within another (if it is smaller), or if the reference polygon overlaps the other. HOWEVER, if the polygons have vertices which touch more than once (eg they are the same shape, or share a common series of vertices) then when I run the getboundingbox command, the arrays minExt and maxExt both return 0,0,0.
Is this a limitation with the getboundingbox command, and does anybody have any ideas on how to fix this problem?