MAYA _ Light linking relationship editor not working

if light linking isn't working with this message:
// Error: file: C:/Program Files/Autodesk/Maya2016/scripts/others/relationshipEditor.mel line 725: No object matches name: shaderBallGeom1
Just close the hypershade ! source

MAYA _ Camera projection mapping not HD format

For a camera texture projection in HD format, nothing special to do but for a non HD format :
- get the ratio of the format (width/height=ratio)
- set the Film Aspect Ratio attribute of the camera to this ratio
- set Fit Resolution Gate to Overscan
- in the projected texture attribute set to Match camera film gate
source