Nodal Offset issue

[jimvfx51]

Hi Greg

I am not sure if this is the best place to post this so apologies if not. 



First off, I would like to thank your many videos over the years. They have been a great resource to me and the entire VP community.



I am writing because I was having an issue with the nodal point offset calculation from your “Perfect Nodal Offset..”video. 

As we use Disguise at Pier59, it’s been a few years since I’ve needed to do the Nodal offset procedure in UE but I recently bought a Retracker Bliss (I love it!) so I thought I’d try the procedure again. 







Very briefly, I did these steps:



- performed lens distortion calc




- imported april tag asset





- added Bliss as LL source (april tag tracks)





- performed observations in lens file for nodal offset











Upon clicking “Add to Nodal Offset Calibration”, I get this error: 
“Failed to resolve a camera position given the data in the calibration rows. Please retry the calibration.”











Any thoughts on this? (I’ve tried this process in the past with Vives and Optitrack and it always seemed a bit finicky).















Thanks in advance,



















Jim Rider

[MiloMindbender]

Hi, I think the issue here might be the confusion about the tags. I believe the Bliss tools use AprilTags but unreal's lens calibrator uses Aruco tags which look similar. If you tried to use an Apriltag in unreal's calibrator you would probably get an error like this. Let me know if this helps. Greg

…

On 09/11/2024 9:05 AM PDT jimvfx51 ***@***.***> wrote: Hi Greg
 I am not sure if this is the best place to post this so apologies if not. 

 First off, I would like to thank your many videos over the years. They have been a great resource to me and the entire VP community. 

I am writing because I was having an issue with the nodal point offset calculation from your “Perfect Nodal Offset..”video. 

As we use Disguise at Pier59, it’s been a few years since I’ve needed to do the Nodal offset procedure in UE but I recently bought a Retracker Bliss (I love it!) so I thought I’d try the procedure again. 

 

 

Very briefly, I did these steps: 


- performed lens distortion calc 



- imported april tag asset
 



- added Bliss as LL source (april tag tracks)
 



- performed observations in lens file for nodal offset

 



 



Upon clicking “Add to Nodal Offset Calibration”, I get this error: 
“Failed to resolve a camera position given the data in the calibration rows. Please retry the calibration.” 



 





Any thoughts on this? (I’ve tried this process in the past with Vives and Optitrack and it always seemed a bit finicky). 





 







Thanks in advance,

 







 







Jim Rider IMG_5684.JPG (view on web) https://github.com/user-attachments/assets/42057fde-b5a9-4f45-ba2e-5b5ca0b487b5 — Reply to this email directly, view it on GitHub #1, or unsubscribe https://github.com/notifications/unsubscribe-auth/AIGCSZDIYZIKJW72FT6WZODZWBS5HAVCNFSM6AAAAABOBJU636VHI2DSMVQWIX3LMV43ASLTON2WKOZSGUZDAMJVGI3DCNA. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>