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A way to solve tripod cam from different trackers

 
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loocas



Joined: 21 Mar 2009
Posts: 18
Location: Prague, Czech Republic

PostPosted: Fri Nov 25, 2011 5:54 pm    Post subject: A way to solve tripod cam from different trackers Reply with quote

Hi,

I need to get a super simple tripod solution for my camera. However, I specifically need the Z rotation of the cam from one tracker and X rotation from a different one?

The problem is the trackers are on different moving planes. One tracker is moving with the camera and the other one is stationary on a stick that the camera is revolving around.

I can use the stick tracker for only the Z rotation of the camera and the background tracker only for the X rotation of the camera, but not both at the same time.

So, I was thinking, can I solve the camera from the trackers on the stick, then lock the X curve and re-solve from the trackers on the background?

I need to get rid of the Y rotation (roll) of the camera which is being introduced when solving only from the sticks trackers. The camera was always horizontal to the ground (it was on a dolly).

Is it possible? If so, how can I do this in SE? Smile

Thanks a lot in advance, best!
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borgus



Joined: 30 Dec 2009
Posts: 144
Location: bremen, germany

PostPosted: Sat Nov 26, 2011 3:45 pm    Post subject: Reply with quote

hi!
one questions... when the trackers are on different moving planes and
the camera is moving around... why is it a tripod shot? I don't get that, yet Smile
Can u show one frame of your footage?

cheers, Seb
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loocas



Joined: 21 Mar 2009
Posts: 18
Location: Prague, Czech Republic

PostPosted: Sat Nov 26, 2011 9:25 pm    Post subject: Reply with quote

borgus wrote:
hi!
one questions... when the trackers are on different moving planes and
the camera is moving around... why is it a tripod shot? I don't get that, yet Smile
Can u show one frame of your footage?

cheers, Seb


It's a dolly shot of a camera rotating (360°) around actors. The green screen plate is also on a dolly on the same rail with the camera.

The only thing that is in the center is a lottery machine + the actors.

I need to add CGI environment around the actors.

I've solved it already, though.

But what I needed to do was to solve for X rotation of the camera from the green screen on the dolly, because the features were always the same height from the ground. And the Z rotation of the camera from the lottery machine in the center, because it was only possible for me to get a satisfactory motion in the Z axis (rotation of the Z axis).

The revolution around the actors was hand-animated. Smile It sticks together rather nicely this way, because there is no contact being visible of the CGI env with the actors, so we can get away with a lot, except for the roll of the camera.
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