[request] Coloured point-cloud MeshLab export

[20kdc]

Is your feature request related to a problem? Please describe. Meshroom 2021.1.0 requires CUDA for the DepthMap node, making that and further stages completely unusable from within Meshroom for me.

EDIT: I later attempted draft meshing and received [01:03:57.339718][fatal] No EImageColorSpace defined for string: GammaCorrected2 in the Texturing stage.

However, I thought to attempt transfer to MeshLab. This was also not directly possible from MeshRoom, as ExportColoredPointCloud exports in Alembic format, which does not import into MeshLab 2020.09 (the packaged version on Ubuntu 22.04 LTS).

Transfer through Blender was also not possible as Blender's PLY export output empty results (not sure on the details of this). OBJ export works without vertex colours but I still need to figure out if I'm inputting the wrong transform.

Looking through the aliceVision binaries I noticed aliceVision_exportMeshlab, but this only exported camera data, which while a potentially useful start wasn't really usable for reconstruction by itself.

Describe the solution you'd like Export of point cloud data to a format MeshLab accepts and Exposing the exportMeshlab functionality as a graph node.

Describe alternatives you've considered A CPU-based DepthMap would work on any hardware Meshroom runs on.

Additional context No additional context.