To edit a face RX3, you need (free 3D software) plus a plugin called FIFA Blender Tools . You import the RX3 into Blender, sculpt the vertex positions (e.g., making a player look more like their real-life photo), and then export back to RX3.
: The editor allows users to import and export textures, typically in format, to customize in-game graphics. rx3 file editor