Apr
29
I’m trying to camera track a roof with an actor hanging on wires. This is a wire removal job basically.
First I created a holdout roto for the actor and the wire masking of the moving objects. Then I used the camera tracker and tracked the background of the shot, which is the roof. I solved the camera and got a RMS error of less then 0.8 Pixels. Now since the roof isn’t straight I don’t know how to setup the ground plane. My main problem is to setup the correct coordinate system so that I can place a card correctly in the scene. I tried to select tracking points and define z and x axes. When I did this, I always switched between 3D and 2D view in the viewer in order to find two points that I thought might be correct in 3D space giving me either the x or z axis. So as I’m looking for two points I found out that the tracking points that are closer to the camera in the 2D viewer are the furthest away in the 3D viewer?! And viceversa: points that are far away from the camera in the 2D viewer are close to the camera in 3D view mode. Does anyobody now what I’m doing wrong? Maybe someone can enlighten me…
First I created a holdout roto for the actor and the wire masking of the moving objects. Then I used the camera tracker and tracked the background of the shot, which is the roof. I solved the camera and got a RMS error of less then 0.8 Pixels. Now since the roof isn’t straight I don’t know how to setup the ground plane. My main problem is to setup the correct coordinate system so that I can place a card correctly in the scene. I tried to select tracking points and define z and x axes. When I did this, I always switched between 3D and 2D view in the viewer in order to find two points that I thought might be correct in 3D space giving me either the x or z axis. So as I’m looking for two points I found out that the tracking points that are closer to the camera in the 2D viewer are the furthest away in the 3D viewer?! And viceversa: points that are far away from the camera in the 2D viewer are close to the camera in 3D view mode. Does anyobody now what I’m doing wrong? Maybe someone can enlighten me…
Thanks in advance for any help, I really appreciate it!
smarty
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