you can also go to the main layer, click "select source" go a layer up, and click "clipping group". makes things a lot easier. and you can keep adding layers up, just remember to click "clipping group" uvu
Just wow, man. I think the 'backwards' shading works a hellavu lot better overall than the other way around.
Tried this tutorial out and am ecstatic with the results! I've attempted it the 'normal' way, but I got frustrated when trying to find how the lighting would look if it were real. Taking away is much more simplistic and less hassle-y. Thank you so much for this!