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It would be nice if the Vector Placement tool could support objects using the "Fake Terrain" material in the future. I use this material on some of my own objects such as fences and hedges to reduce the amount of light reflected off of the object, as it can be too bright at a distance when using the "Standard" material and double-sided faces with alpha.
This material is also used by some of the default fences. However, unfortunately this material will not show when used as a Vector Placement, resulting in completely invisible objects, or objects with parts missing (if using a mix of material types). In SU11, these missing objects would sometimes show as a wireframe.
-RN44
