ok I'll have a few things to say here. Us video gods, dont actually sit up here on the top of Mount Olympus doing nothing from one year to the next. Making decent videos takes time and planning. My original 'tutorial' was never intended to be suitable for beginners and I'm not going to spend a whole...
its possible to do a convex warp with the transformer/patch/shapes/fill
or you can do a grid warp with madmapper
but if you are hoping to get a perfect image across 3 projectors on a curve, you'll need expert help