Hi, I am using a pan/tilt robot to take pictures which I later assemble to 
a panorama using Hugin. Using the robot I get very a precise yaw-position 
for each image, and I input these values into Hugin. Then I want to 
optimize roll, pitch and the lens parameters before stitching. All the lens 
parameters are linked to a single lens instance (I do not touch zoom/focus 
during the take). I would like to link the pitch and roll parameters to a 
single instance as well, but I cannot find out how to do that. Does anyone 
know if it is possible in Hugin? 

It is possible in PTOptimizer, you can edit the .pto-file and enter ‘r=0’ 
and ‘p=0’ for all but the first image and only optimize r0 and p0, but it 
would be nicer to be able to do it from within the Hugin GUI.

The reason I want to do it this way is that I believe the cameras axis of 
rotation is very rigid. If assuming the axis is pointing straight up, then 
each image should have the exact same pitch and roll (only different yaw), 
and should be optimized as a single instance. And it is always good to keep 
the number of free parameters as low as possible.

In real life the axis is of course not pointing perfectly straight upwards, 
but that can be corrected after the first optimization by dragging the 
whole panorama as one entity.

- Henrik

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