You can use Make Importance Texture | Unreal Engine Documentation and Importance Sample | Unreal Engine Documentation to do that. An explanation of those can be found here: Unreal Engine 4.17 Release Notes | Unreal Engine Documentation.
You can use Make Importance Texture | Unreal Engine Documentation and Importance Sample | Unreal Engine Documentation to do that. An explanation of those can be found here: Unreal Engine 4.17 Release Notes | Unreal Engine Documentation.