I'm trying to convert a bunch of building wall tiles from SHP to DWG. The tiles are already polygons, but I coerced them into fme_polygon anyway. Then I use the DWG styler, with Area: Hatch, Fill Pattern: SOLID. The Inspector shows what I expected, however when I write the data, what I actually get in AutoCAD is just line-thin hatches, with some even missing. Also, when I open the file in the inspector, it just shows the lines on the ground, or everything got flattened.. do I need to manipulate the data further? I figured I could leave it as polygons, but AFAIK AutoCAD still interprets those only as the boundary lines, i.e. not opaque surfaces.
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I understand that this is an older question, but maybe the answer is still relevant.
Hatches need to be flat. I.e. all vertices either have the same height value or are 2D. You could use a 2DForcer to flatten the 3D polygons.