Use antialiasing only on some actors

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@Michael

I will try to look at your file this afternoon.

vtkOsmLayer is the layer that contains OpenStreetMaps (Osm) tiles.

vtkOsmLayer is a feature layer, vtkFeatureLayer has an array of features (vtkFeature)

A tile is defined in vtkMapTile which is a layer feature (vtkFeature), a vtkFeature has this method vtkProp* PickProp();

So, in vtkGeoMapLayerPass, I guess, we have to determine to which vtkFeature a vtkProp belongs (I can work that) and disable the antialiasing on the vtkProp am I right ? So if you can give me a pseudo code, I can fix that.

Thanks !