3/6/2023 0 Comments 123d design alignThis process is pretty intricate and having no controls seems a little scary. Total blackbox: no controls to guide the 3D reconstruction or manipulate the results.Limited texture map size: in my few tests, the texture maps returned from 123D Catch’s automatic processes are returned at a given size…you have no control over how big a map you want.Down-rezed photos: pretty sure in order to speed the photo’s “ascent” into the cloud, the pictures are scaled down limiting their detail and use as a high-rez texture during the projection phase.Plus, capturing larger 3d scenes like detailed environments will require more than 70 pictures pretty quickly. (the non-mobile version for Windows is limited to 70.) There’s no technical reason why there should be any limit. Photo limits: the iphone app seems to allow a maximum of 40 images.Surely, a lot of power was being sacrificed by its fully automatic workflow? Here are some other ways that 123D Catch is quite limited: Was this futuristic tech (FUTURETECH?!1!!) finally in our hands?īut….I wasn’t thrilled by 123D Catch’s black box nature, and wondered whether there were any open source alternatives that could be used that wouldn’t have as many limitations. It had always seemed like ultimate vaporware, but now it was here, on an iPhone! I also remembered watching a product demo for a piece of software called ImageModeler from Autodesk a few years back that was more manual, but still pretty amazing. I remembered seeing something like this years ago: a product demo called Photosynth from Microsoft, which did this sort of reconstruction from thousands of tourist photos of the Notre Dame Cathedral. Until Dan showed me some models he generated from exhibts at the AMNH I didn’t really get the point of Catch…so what, you have a model of your water bottle…but what Dan showed me was that it worked incredible well on environments too: The Hall of African Mammals or even the penguin diarama from the infamous whale room! This is all done using a process called Photogrammetry or Structure from Motion (SFM) where the computer examines common features in each image and is able to construct a 3D form from overlapping features. 123D Catch (henceforth also refered to as “Catch”) is part of Autodesk’s consumer-line of 3D technologies which include a product for 3D modeling on the iPad and producing 3D prints. You feed in some pictures from your iPhone and they get uploaded to the cloud where they’re turned back into a textured 3D model you can explore on your phone or download on your computer. So a few weeks ago, Dan Short showed me 123D Catch. Hannah Davis: debugging + emotional support + snacks.Dan Short: for showing me his awesome 123d models that sparked this whole idea.In part two, I’ll flesh out more VFX-centric application of this workflow. This is part one in a series on open source photogrammetry.
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