The ConstructFromPolygons method is a member of the MapMesh class within the Editor.MapDoc namespace. This method is responsible for constructing a mesh from a given set of polygonal data. It takes a single parameter, mesh, which is of type Editor.MeshEditor.PrimitiveBuilder.PolygonMesh. This method does not return any value.

To use the ConstructFromPolygons method, you need to have an instance of the MapMesh class. You can then call this method by passing a PolygonMesh object that contains the polygonal data you wish to use for constructing the mesh.

This method is typically used in the context of map editing within the Hammer editor, where you might want to programmatically define or modify the geometry of a map node.