2D Hatching Requirements

Methodology  

1. The plugin retrieves all hatchings (areas) present in the same Civil 3D or AutoCAD layer whose name has more than 5 letters (so not to take layer 0 or any other modelling layer). 
2. Then the plugin adds up the value of each hatched area to obtain a global hatched area for the layer. This corresponds to a pavement design option. 
3. Finally, the user can define or apply a pavement model to create the various layers of material for this option. 

Modeling 

Here is a typical example of correct 2D  modeling required for the plugin to function correctly.

Define a new layer with the name of the desired pavement option, e.g. "PavementType FF1".

Draw closed polylines corresponding to the road boundaries. 

Add hatching within these closed polylines inside the "PavementType FF1" layer. 

If you have set up 2D modeling as above, when you launch the "2D Hatching Option", hatch retrieval will be carried out correctly. 

Remarks  

If the hatch has not been modeled correctly or, for example, if its boundaries have been removed and the value of its area is not available, the plugin will computationally redefine the value of its area. 

Note: This approach may yield slightly less precise results compared to cases where the hatch is accurately modeled.