Camera Tracker, Green Screen, and a 3D Room

[Sean Morton]

I am certainly going to try that next time! How would you do it with a closer shot though? I am guessing you are going to say i have to restrict my movement. I suppose i could hang some markers above the actors head so as to not impede the shot.

Do you have another suggestion?

one more thing… how should set origin be used in camera tracker? that really confuses me.

Thanks
Sean

[Ben G unguren]

If you don’t see the ground, then you don’t really need the solver to know exactly where it is. In that instance, I usually make the origin my point of interest (where I am putting in CG elements, for instance).

But, as others have said, the main difficulty with this shot is the lack of parallax: you need foreground, mid-ground, and background elements. And you only have background.. I use syntheyes, and if someone gave me this shot I would tell them that there may not be enough 3D information to get a good solve, but it might be possible to get a 2D track; that is, to treat the camera as though it were on a tripod. Of course, the shot is handheld, but you don’t move it around enough in 3D space to give much confidence for a 3D solution. Really you might get better results doing this in Mocha as a planar track, particularly if you only need to put in a background plate.

I recommend the syntheyes website for good general rules on what makes a track-able shot.

Ben Unguren
Motion Graphics & Editing
http://www.mostlydocumentary.com

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