It’s a control map, so that’s pretty much intended behavior. There is an RGB mode but I don’t think that’s what you are after- it just lets you use the three components to pick the direction of displacement. If I understand correctly that you want to use color images’ luminance as the control data for displacement along the normal then sure you can, but you’d be better off just using a textureFX for that. ColorChannelRemap should do what you want out of the box already. Also note you don’t need to build a texture array if you are only using one control map.