[stefanhendriks]

Although i am not an expert, i think it somehow has to do with the fact the 'tree' is not visible from that point according to the engine. It probably does some sort of trace or calculation and fails there. Though when you come closer the angle changes and thus the above same calculation succeeds. I think its engine related, but for fun you could try to raise the tree with a few units and see if it happens again. I bet the engine only does a basic check to know if its visible... perhaps you can do something with setting 'size' of this object? THat could also help a bit.