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Topic: How 123dapp works?

Does anyone knows how 123dapp transforms a series of photos into a STL file?
Is there a opensource aplication that does that as well?

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Re: How 123dapp works?

VisualSFM is not opensource but I beileve it leverages some opensource tools.  If you need truly open source, I believe there is a Python photogrammetry toolkit or something like that.