Camera view to accurately determine projection mapping?

[jarjones 5]

I've designed a show in VW that will have many projections on multiple projection surfaces that change location.  We're running through Q lab and I was wondering if there's a way to use a camera placed at the location of the projector to create the projection surface masks.  It seems like there could be, but I know there are so many camera variables, that I could see it being completely wrong.  Is there a way to get an accurate POV from a projection standpoint?

[JBenghiat 355]

I have a tool designed for this. After setting projector lensing and focus, you can view from the projector.  

 

https://www.benghiatlighting.com/software/products/pv-1

[jarjones 5]

Excellent! Just purchased.