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Do you mean we have to activate that for ***every ***actor now?! Because I’ve done that on Characters when I was using 4.7 and had no results…
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No, the bReturnMaterialOnMove should only have to be turned on on the blueprint that is moving and attempting to find the physical material. However, if you are moving on landscapes there was a separate bug reported that has been fixed and scheduled for 4.8. If you are moving on BSP’s they are hollow and do not properly return traces due to . It may work if you put a blocking volume inside the BSP but I have not tested myself so I cannot guarantee results until I’ve had time to test it one way or the other.