Matching orientation/scale from one align (re-oriented) to new one with same XML data

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    andrew.poznanski1

    Adding one important bit: I no longer have the old Project, I just have the exported obj's with their .rcinfo files. Everything was exported with default Coordinate system setting (Grid Plane).

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    Götz Echtenacher

    Hi andrew,

    I'm 99% certain that the grid plane is only an internal display adjustment and does not change the coordinates themselves. This is probably why the meshes are in the correct positions. Since you export the meshes as Grid Plane (which means the adjusted position), it will not match in the external software. The solution would be to export them as Project Output which means to use the "real coordinates" instead of the relative (adjusted) ones.

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    andrew.poznanski1

    In this case I was hoping to have one 'Master align' - first area of large project, nicely re-oriented, and then have subsequent aligns matching it, with new areas of the same large structure added later (shot over period of several months).

    What you are saying is that I can only do that if I export the 'real coordinates'? I hope a solution can be found, as these coordinates are always skewed (without control points RC doesn't know where is XYZ), plus in this particular case I don't have that old project anymore - just exported geometry with .rcfile information.

    Thx for taking the time to help!

    -Andrew

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    Götz Echtenacher

    Hi Andrew,

    no problem!   :-)

    Yes, the orientation wothout known coordinates is a bit wanting.

    What I would probably try is to scale it roughly, then add two GCPs that you know are on one axis of your intended orientation, note those coordinates and make a simple transformation (as in calculate the distance and then set one of them to 0 (only for two coordinates, leave the third unchanged) and the other on one axis with the distance as 2nd coordinate. If neccessary, you might be able to repeat this step for the third coordinate.

    But it's all about the old project, if that doesn't exist anymore, then it's a moot point. However, you could just recreate it since you seem to have the images still...

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    Götz Echtenacher

    Thinking about it, your issue is not uncommon - a model needs to be aligned but there are no known coordinates or scale. I'll make a feature request here: https://support.capturingreality.com/hc/en-us/community/posts/115003716432-orientation-along-xyz-axis

    Feel free to join in...   :-)

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