i have added 3 spherical images, aligned them and added markers to set an arbitrary local coordinate system.
i then imported a planar mesh (densely triangulated, from 3dreshaper) and tried building texture and orthomosaic from just one of the spherical images to get a nice floor orthophoto.
in both cases i get an unfortunate artefact where the spherical image wraps around. In the textured mesh the triangles at the seam are not textured at all, and in the orthomosaic the seam has some crazy distortion going on as shown in attachments.