Center Pivot Not Centering Correctly

[amandaallsion.lila]

I just experienced a bug with the Center Pivot, which is very concerning, since it could cause major problems with future files if it happens again. This is in Alias 2025, and I CAN reproduce in my current file, but cannot reproduce it once I save and re-open the file. It also does not reproduce if I copy/paste it into a new stage. 

It happened with the "CV Centroid" option and did not happen with the other two options ("CV Bounding Box" and "Geometry Bounding Box"). I am hoping that if I change the option to one of the other two that this error won't happen again, but I wanted to make you aware this did happen, and with a very clean, simple file that only has lines in it, as well.

I had a co-worker record video of the center pivot function not working correctly, since I wanted to assure it was not an error on my part and also have evidence for you that this did happen. The video shows me verifying I am selecting the component only, applying zero transforms, and applying Center Pivot, with CV Centroid and showing the CV's all symmetrical, (it's a circle) - but the pivot centering off center. I do the same with a new group of the components, with a similar, but less noticeable shift of the pivot off center. I then paste it into a different stage, and the center pivot functions correctly. Again, if I save the current file and re-open it, it will center the same pivot correctly then.

Another oddity, which also happened in this file, and I don't know if it is related:

The Perspective Camera does not always show up in the SBD window as its grouped 3 components, but sometimes appears only as a single null node. Before I realized it was my Perspective Camera, I tried deleting null nodes, but it was not going away. I then realized it was the perspective camera, as it would sometimes show the full group when I clicked back in the SBD window. 

If you would like me to send the video, please let me know. For now, I am attaching 3 images showing the CV placement of the components and groups, and the resulting location of the centered pivot.

Thanks.

[KaiTi.L]

@amandaallsion.lila thanks for your detailed description and attached pictures. I tried to reproduce the issue but was not successful. Could you please write down the steps when the issue does occur? The mentioned video would also be helpful.

[ptelisman · Accepted solution]

Hi Amanda, 

    The three methods within 2025 are called CV Centroid, CV Bounding Box and Geometry Bounding Box. If the CV Centroid option is selected, the center pivot is not always in the circle center.

The example you have pointed out uses a Non-Periodic Circle -
In this particular case there are multiple identical CVs, the start and endpoint which are located in the same position, hence the centroid of all CVs are drawn in their direction.

Here is a link to the documentation giving a bit more information on the different options/settings - Alias 2025 Help | Center Pivot | Autodesk

I've also shot a short video illustrating an example using non-periodic to help illustrate the different results.

Regarding the additional issue with camera nodes, if you could supply a file or video that would be great.

Thanks,
Paul

[amandaallsion.lila]

Thank you very much for this response, Paul, and for taking the time to make a video to explain the differences! I was not aware that there was a change to the Center Pivot tool. I never made a change to the options, and it suddenly was behaving differently. I am very glad I noticed this! It could have caused major problems in my model down the line. I am glad to understand what was happening now. Thank you!

[amandaallsion.lila]

Sorry - I missed your question/response until now. Paul's response explains what was happening with the center pivot issue, and also has a video attached explaining what happens with the 3 different center pivot options. Is that what you are asking about, or are you trying to recreate the bug with the camera node? I am not concerned about that as it was a one time issue I saw. Thank you very much for your help, though!!