Add index output to project_facing_points

[thompson318]

In GitLab by @JoaoDanielMarquesRamalhinho on Feb 11, 2019, 09:54

• In sksurgeryvtk/utils/projection_utils.py, the function project_facing_points does not output the index of the 3D points that face the camera.
• In case we want to compare projections of the same 3D pointset (stereo), these indexes are necessary to compare where each point projects in the image.

[mxochicale]

Hi @MattClarkson and @thompson318 ,

Shall we close this one? In the meantime, I labelled as low priority.

Thanks

[thompson318]

It looks like this would be quite easy to do. I'm not sure anyone still wants it though so we could close.