You divide the relative coordinates (in inches) by the distance (in inches) of 
the 'anchor' image from the projection plane - this gives TrX etc. values which 
are unitless.

If you don't know the distance to the projection plane, then Hugin can 
calculate it for you. Estimate the distance and divide the coordinates as 
above, then optimise just the TrZ values of all photos in the project.

-- 
Bruno


On 15 April 2021 22:48:47 BST, SRM wrote:
>It does make sense. I've been doing just that and am getting close to what 
>I want to see, but I'd like to be a bit more precise with respect to this 
>variable.  Is there some way I can use the real word physical
>measurements 
>I do know to calculate the correct offsets to apply to TrX and TrZ  for
>the 
>1unit sphere projection?  Specifically I have a secondary camera who's 
>entrance pupil was physically located at -3.6" in the TrX direction and
>
>+1.6" in the TrZ direction with a Yaw of 48.9 relative to the primary 
>camera who's corresponding location and yaw are zero. Isn't there some sort 
>of formula I can apply to get an accurate TrX and TrZ value that applies to 
>the 1 Unit Sphere?   Perhaps the horizontal view angle of all the cameras 
>(49.95 deg) would be a pertinent variable in such an equation?

-- 
A list of frequently asked questions is available at: 
http://wiki.panotools.org/Hugin_FAQ
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