In Flame, I often use Planar Track to hold one point, retouch it, and then use a GMask with tracking to remove unwanted elements.
Using the tracked axis, I then hold another point for additional retouching by copying and parenting a new axis under the previously tracked axis, fixing the axis values at that point, and enabling Invert to perform the cleanup.
Normally, this workflow works without any issues.
However, when I enable Perspective in the Planar Tracker, the tracking on the other point no longer works as expected.
Could you explain why enabling Perspective in Planar Tracking prevents the other point from tracking properly?
Once you turn on perspective, the planar tracker is now moving in 3d space and not just changing the mask on a 2d plane. You can see the difference if you create one version without perspective and then another with perspective, and then look at the scene with a top/side view or perspective camera.
With perspective enabled, the child axis is now moving in space and the tracking just doesn’t really work.
Could you, in theory, hang a camera off the perspective-tracked plate the way you can with “not Randy’s camera projection”?
I’ve never tried. Always just use the non planar track or go whole hog with a camera track.
EDIT: it works. Make sure that the card hanging off of the tracked axis is zeroed out (don’t try to make it correctly planar). If you do this, and film it through a camera hanging off the card as you would in Randy/Kirk/Patrick’s technique you get a stabilized result that can be successfully re-applied in a downstream action just as you would with a normal camera projection stabilization (copy the action, plug the stabilized output into the card input, remove the diffuse map.)
I didn’t want to be too negative, but it works, TECHNCIALLY.
it does not work as you’d want it to; it does not “unproject” the surface the way a camera project does. it’s just that if you’ve used a perspective surface to stabilize you can invert the stabilization using the not-Randy/Kirk/Patrick technique.
I would strongly advise not bothering, as a non-perspective planar track has similar utility with less baggage and a camera track/projection is significantly better for anything not doable with a planar track.