This attribute
controls the behaviour of the
AST_SIMPLIFY method when applied to a
Polygon. The simplified
Polygon is created by transforming the vertices from the
Frame in which the Polygon was originally
defined into the Frame currently represented by the Polygon. If SimpVertices is non-zero (the default)
then this simplified Polygon is returned without further checks. If SimpVertices is zero, a
check is made that the edges of the new Polygon do not depart significantly from the edges
of the original Polygon (as determined by the uncertainty associated with the Polygon).
This could occur, for instance, if the
Mapping frrm the original to the current Frame is
highly non-linear. If this check fails, the original unsimplified Polygon is returned without
change.