Parser to contribute a node's geometry data for [NavigationPolygon] baking. Parser to contribute a node's geometry data for [NavigationPolygon] baking. If a script extends this class and the function [method _parses_node] is overridden and returns [code]true[/code], the overridden function [method _parse_geometry] gets called and can be used to add custom geometry data for the [NavigationPolygon] baking process. Called when overridden and the [NavigationMeshGenerator] is parsing geometry for [NavigationPolygon] baking. Custom 2D geometry can be added to the [param source_geometry]. Called when parsing geometry nodes for [NavigationPolygon] baking. If [code]true[/code] will call [method _parse_geometry] with this node.