I'm a newbie using 5.1 and have some experience with aligning projectors. Problem is, we need always to mount the projector so that it is on the outside top of a truss cube projecting inside on the floor http://www.eventworks.ae/page7/files/page7-1003-full.html
This gives you a lot keystone distortion. I now tried to adjust the keystone distortion with the grid using perspective and that works ok, but you end up first with a big linearity mismatch top to bottom of the picture, and, when you adjust that by getting the bottom part of the grid up you get rid of the linearity problem but the picture is half the size in y only.
I know you can do this with a projector like Christie with the Twistboard and resize the picture then, but not all projectors can do so.
Any suggestions?
Also one more question - to do linearity with the full adjustable grid is really difficult and eats a lot of time. Is there any way to move a complete single horizontal line up or down and is there any "undo" for the last action?
