Mod Unreal Define a brush. February 14, 2023February 14, 2023 nick create a black and white image with a transparence. Next select all by using the keyboard shortcut Alt + Ctrl A or using the menu select and clicking on all. Then you need to define your brush by clicking on the menu Edit > define brush From here you can define your brush by using the brush option menu. If you can’t find it select the window menu than brushes. then click on brush settings. From there, you have a lot of options on how you want to control your new made brush.