homography for camera calibration

I’m thinking I’m going to use the homography glwarp (a la http://forum.openframeworks.cc/t/quad-warping–homography-without-opencv/3121/5) to place multiple projections because we want to slightly overlap the projections and then calibrate them using virtual fiducials. I’ve run some little tests and it seems to work ok, but I was just wondering if anyone else had done anything like this and if they ran into any trouble? Originally I started doing this with fragment shaders, but the glwarp seems way more smooth and easier to get positioned just right.

(Had a little debate with myself as to whether this should go here in extend or advanced, but figured here is fine.)