Link cubemap sides from suffixes in filename ( _left, _right, etc.)

[cpkcpkcpk]

Hi, considering the lack of support for equirectangular/spherical images, a nice workaround would be to link the decomposed cubemap sides from suffixes in their filenames. I currently find it very difficult to align the cubemap sides in colmap due to the lack of overlap.

This is how 3DF Zephyr deals with equirectangulars, and it seems like a good workflow - https://www.3dflow.net/zephyr-doc/en/Decomposeequirectangularpanorama.html

Zephyr decomposes each 360 image into 6 pinhole like cameras, and uses these as constraints during the Structure from Motion phase as long as the filenames of the extracted cameras keep the suffixes in the filename ( _left, _right, _front, _back, _top, _bottom).