Paul Ramsey wrote: > > Would a type-cast which forces box3d into a polygonal envelope clean up > such problems? BTW, after transformation, is a box3d still rectangular? A BBOX just has the Bottom LL corner and Top UR corner in it. Transform() now just transforms these 2 points, so the result is *always* rectangular. 'envelope( <bbox-only geometry> )' will return a polygon. dave