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Track Motion perspective corner pin……object inside rotates
I am recreating the HP commerical where the guy holds the paper frame infront of his face, and a still of his face is held in place while he continues to move the frame. I have done a pretty good job using motion tracker perspective corner pin. The picture inside follows and rotates as it should. Everthing goes well, until right near the end when the frame is rotated past a certain point. The picture inside flips 90 degrees, then it flips back a few frames later, to where it should be, when the frame is rotated back just a bit more. I can not find anything to contrain the rotation. I don’t have a clue of what to search for.
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5 Replies
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all i can think of, is that your traker is swithcing corners as they cross, if they cross, you may have to handimate the few frame inbetween.
i hope that helps
Aaron Zander-Student edditor
If it’s out there and it does somethign to something,
teach me how to use it
Powerbook g4 1.5 GHz (it might not be big, but i can take it on set
fcp 5, ae 6.5pro adobe cs2 -
I know what you mean. I thought of that, and checked it. The corner points do not cross. I went trhough frame by frame. The flip happens when the frame roatates just beyond 90 degrees from where I started tracking. The picture flips back when the frame rotates back. I tried to mess with the inside picture’s rotation properties, the picture turned the proper direction, but the aspect ratio became distorted in the opposite direction.
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well humm, i bet it’s something to do withtta 90
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OK. I figured it out. The points were definately NOT switched. I had set the points frame by frame manually. All of the numbered corners stayed numbered in proper order. I watched all of the corner pin keyframe numbers as I moved frame by frame. At the point where the flip happened, I saw sets of numbers change drastically. So I wrote all of the numbers down and analyzed them. I found that sets of numbers were switching in each column. I flipped the numbers back for the 4 bad frames, and everything worked.
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i had a similar experience several months ago when designing a 3d box of pictures, part of it, im sure was my freshness to a.e. especially cameras and 3d.
anyways, this camera would circle aroung this box showing all the sides, and to ease it with the camera i also moved the box, as this happened. well it finally came to the top of the box where the camera would prgress inisde revealing 6 more pictures.
when it decended, the box (or the camera i never could figure it out, i should go back and look at it if i still have the .aep) would flip and rotate randomly neerly every frame with no particular pattern.
confused the heck outa me, but luckly it was for a psychology class and i just told my teacher it reflected my internal confusion. I got an A (:
after effects and finalcut, and any program that can do such amazing things can sometimes just get ahead of itself i think. who knows
Aaron Zander-Student edditor
If it’s out there and it does somethign to something,
teach me how to use it
Powerbook g4 1.5 GHz (it might not be big, but i can take it on set
fcp 5, ae 6.5pro adobe cs2
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