[Solved] - Issue with krpano Tools spheretocube -rotate and image.prealign

I have some highly misaligned panoramic images, and I want to convert them into perfectly aligned cube faces.

Here’s my process:

1. I obtain the image.prealign (x|y|z) values using krpano Tools → Edit pano-type → Set North and Level the Pano.
2. I invert the values: positive becomes negative, and negative becomes positive.
3. I run krpanotools spheretocube CUBE pano.tif cube.tif -rotate=XYZ,x,y,z

In some cases, the cube faces are generated perfectly aligned. But not always.

When I change -rotate=XYZ,x,y,z to -rotate=ZYX,x,y,z, the cube faces that were previously misaligned become perfectly aligned. However, those that were already aligned now become misaligned.

I have two examples:

• prealign="-2.547|-41.74|1.762" → with -rotate=XYZ,2.547,41.74,-1.762, the cube faces are perfect.
• prealign="-0.416|75.013|-2.556" → with -rotate=ZYX,0.416,-75.013,2.556, the cube faces are perfect.

Here’s my question: how do I determine when to use XYZ and when to use ZYX?
Is there a formula or a method to figure this out?

Thanks!

Translated by ChatGPT.

Hello,

I think my question is a bit technical.

I would like to work on some scripts over the weekend.

Does anyone have any suggestions on how to do this? klaus.krpano ?

Thank you.

Hi Klaus, thanks for the feedback.

I did some more tests and got really confused. 😵

Example:

- I take 6 perfect faces and generate a perfect panorama.
- With this panorama, I generate 6 faces with -rotate=XYZ,-1.5,20,3.5
- With these 6 faces I generate a misaligned panorama.
- To return the 6 perfect faces I used -rotate=ZYX,1.5,-20,-3.5
- If I use -rotate=XYZ,-3.5,-20,1.5 it doesn't give the same result.

In the viewer, the panorama is not aligned with any of these values in image.prealign. I got a satisfactory alignment with "-1.4|20.1|3". 🤯 And with these values in -rotate I don't get the aligned faces.

I'm attaching the aligned faces that I used in the tests.

Thank you very much.

Hello,

Thank you very much klaus.krpano, it works perfectly. 🥇
Maybe it would be interesting to have an example like this in the documentation.

Thank you for your work.
Krpano is amazing.

Quote from klaus.krpano

Hi,

for the next release I have added a -prealign=X|Y|Z option for the tool, then the prealign setting from the xml can be directly used witout any change.

Best regards,
Klaus

Hi,

Excellent solution. 🎉
Thank you very much!!

Quote from Fernando

Hi sexta, very interesting post, until now I had not worried about aligning the .jpg image and only did it in the .xml code. I see that with minimal effort the image is adjusted.

Hi,

Yes. In my case, it helps me keep a more organized workflow.