# extrude.set.badzones

Syntax

Checks whether or not any elements in the set have bad geometries based on the extruder criteria (the check is performed for quadrilateral elements only). Will return true if the set contains at least one bad quadrilateral element which if extruded into zones may result in the “bad geometry” error. The function checks for two most severe prbolems with 2D quadrilateral elements (in the Extrusion Pane): element is not convex or if the area of a triangular sub-element in each overlay $$\le$$ 10% of the whole element area.