MR external photogrammetry
Converters not implemented in Alicevision but available in openMVG:
openMVG_main_openMVG2Colmap
openMVG_main_openMVG2openMVS
https://github.com/pmoulon/CMVS-PMVS http://francemapping.free.fr/Portfolio/Prog3D/CMVS.html https://github.com/qedsoftware/pmvs-gpu