4th Corner - Tracking

[philspitler]

Hi,
I have quiet a bit of hand corner pinning to do where tracking just won't cut it.

I was wondering if there was an expression or script that would help keep the proportions of my corner pinned screens intact.

If I know that 3 of them are lined up, there must be some math that can give me the position of the 4th corner.

Any ideas?

Thanks.

Phil

[vidpat]

I was working on a script (setting up expressions) that did something similar, but had to put it aside. I think that it is possible. However, the problem is that, due to projection of points to the plane, there will be multiple solutions to the system of equations that govern the relationship among the four points, if they represent an object in space.

If you know that all for points will fall in a single plane parallel to the image plane, then it would be much easier. Is this the case for your project?

[philspitler]

It is a screen on a PDA but it is hand held with motion on all axis.

But it is a flat plane.

Phil