Parser to contribute a node's geometry data for [NavigationPolygon] baking.
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<description>
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].