By combining a Texture Coordinate node with a Component Mask node in UEFN, you can create a grayscale gradient that’s more efficient than importing a bitmap texture. 
Save time and resources while enhancing your design! 
#FortniteCreative #GameDev
https://dev.epicgames.com/community/learning/tutorials/kBBO/fortnite-material-nodes-uv-coord-and-component-mask