Turning Corner Pin into 3d coordinates

Theoretically, you should be able to do it with just three corners. You know that one side is the solid's width and the other is the height and that the actual angle between the sides is 90 degrees. Given that, and the coordinates of the three corners projected onto the comp view should be enough (I think) to calculate the position and orientation of the solid. I don't have the 3D transform chops to do it though.

Dan

Create 3D depth from 2D planar tracking using corner pin into quatra points in 3d space. bam?

http://www.videocopilot.net/tutorials/magic_tracking/