Also consider if the fence is supposed to cast a solid shadow or a mostly transparent one. Using more accurate vrad settings gives you more accurate, and visually appealing, shadows for objects with partially transparent materials.
I've never trusted those options for the chain-link fences, and I don't think Valve does either (correct me if I'm wrong butI think the official maps just disable shadows). They only look right when you crank the lightmap scale down to like 1 or something.
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