## Changes Introduced in V7.3.4

The following describes the most significant changes which occurred in the AST library between versions V7.3.3 and V7.3.4:

1. By default, the simplification of Polygons no longer checks that the edges are not bent by the simplification. A new attribute, SimpVerticesSimpVertices, can be set to zero in order to re-instate this check.

2. The PolygonPolygon class has a new mathod, astConvex, that returns a Polygon representing the shortest polygon (i.e. convex hull) enclosing a specified set of pixel values within a supplied array.