Thanks HBG2. Did GRD say how he knew for sure the effect was done and why it was done that way vs. fiber optics, etc?
It wouldn't surprise me if this was a projection effect based on some experiments I've done projecting footsteps into a hallway. Sort of by accident, I found the footsteps "walked" nicely up a door or wall onto the ceiling (and the same in reverse) without much, if any, distortion. In a similar way, the Haunted Mansion footsteps walk up a 3D staircase without looking distored. Here are my early experiments. So the first projection set-up below is how they do it? (front projection from below)
Wondering if there would be any way to confirm how the effect is being done in-ride, e.g. at the Ballroom scene, holding up a lit cell phone screen will reflect in the glass. With a projection effect, if you looked closely enough, would you see dust particles in the projection path?
Or is there any other indicator in videos of the HM effect that would reveal it to be front projected versus some other method?