XMP workflow problem

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3 comments

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    Götz Echtenacher

    Hi Merih,

    I've used XMP only a few times so I'm not too experienced.

    It strikes me as odd though that it only works with certain files in the cache. Do you start from scratch with the new alignment or is the "mother-component" still present?

    A relatively easy workaround would be to identify the file(s) responsible and make sure that those will be present in the cache before a new alignment.

    I am also surprised that the scale would be kept with a new alignment. Are you certain it is true? You need to measure because the Display grid in RC does not correlate to the coordinate system (apart from the direction of the grid lines) but has a somewhat arbitrary position, changing from alignment to alignment. In my experience, a new alignment leads to a completely new scale and orientation, which might only roughly be the same or only look like it is. Might be different with XMP, but I would also think that the positions are either locked or, like in your case, not which means that RC would neet to decide where to move the cameras. Quite possible that the changes are way below your needed accuracy though.

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    Merih Oztaylan

    Hi Götz,

    I have checked again after your comment about having the scale propagate from mother to child. Everything looks perfectly reasonable. When I export the XMP's of the child setup and compare it with the XMP's of the mother setup I see that the child's camera position and rotations changes slightly to compensate for the fact that the  rig moves a bit. But roughly (but not that much) everything stays the same. This is ofcourse if I work with a preloaded cache. If I empty the cache the positions and rotations change drastically.

    For further testing I went through the same procedure this time keeping "prior calibration" and "prior distortion" as "fixed" but keeping the "prior pose - absolute pose" at "position and rotation" assuming lens values would not change when the rig moves a bit. To my surprise I get proper alignment even  without the cahce.

     

     

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    Götz Echtenacher

    Hi Merih,

    sounds good!

    Are the camera positions then identical or does RC still compensate? If the latter, then you should be good to go, right?

    I still find the cache thing weird. Maybe RC uses some info of the mother if present in the cache...

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