h a l f b a k e r y
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A combination of the Wall Printer idea with a laser and optical scanner.
The laser scanner can scan a wall for minute variations in texture.
The optical scanner picks up the correct color pattern off the wall.
A plotter type device then can excrete the right levels of stucco or faux paint
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||I don't see plotters crawling over walls. 3-D wallpaper is so much simpler.
||There's definitely engineering challenges to be solved here, but the goal of the idea is to actually copy a wall you've seen somewhere.
||Perhaps made to order 3D wallpaper can achieve the same thing simpler, but first it would have to use something similar to the description to pick up the original pattern.
||I like the custom-ordered 3d wallpaper idea best, I think. The cost of having a robotic wall plotter do the work would likely be as much or more than having an artist/craftsman do it. Artists are cheap. Equipment is expensive, especially when employed on-site.
Plus, I think you could work off of digital photographs of the original... That's how video game artists get their pixels for rendering surfaces.