Illuminated mockup?

What are we seeing here? Looks like internal illumination of a paper mockup in order to better visualize seams and overlaps…? Pretty cool, never seen that before.

@rkuchinsky are you familiar with a process like this?

Source: Matador x Carryology | Advancing to EDX Lite - Carryology


I’ve never seen anything like this, though bags are quite different than footwear.

The idea I think is interesting to visual seam allowances though I would think a pattern maker would rather make the overall pattern, then break it apart, then add back standard allowances. How the mockup material overlaps isn’t really relevant. Then again, I’m not a soft goods designer so I’m just guessing.