下列步骤详细说明如何向您的项目添加物理表面类型。
"编辑"（Edit） -> "项目设置"（Project Settings）...-> "物理"（Physics） -> "物理表面类别"（Physical Surface Category）
将"SurfaceType#"旁边的"名称"（Name）字段中的"无"（None）改为您希望该表面类型表示的物质的描述性名称（混凝土、皮肉、木头，等等）
Welcome to the new Unreal Engine 4 Documentation site!
We're working on lots of new features including a feedback system so you can tell us how we are doing. It's not quite ready for use in the wild yet, so head over to the Documentation Feedback forum to tell us about this page or call out any issues you are encountering in the meantime.
We'll be sure to let you know when the new system is up and running.