All is in the title 
in ZB4R4, it’s very convenient to use image references on the grid to create realistic meshes. But then there’s a time when i need to project the background as a polypaint texture, so i use Spotlight with scale option etc but… See what i mean ?
Just projecting the background would be faster and perfect because it’s actually scaling at the same time as the zoom on the document, very practical… Tell me what you think.