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Relight Lab 2024.01 - Different Highlight Region Size When Defining Spheres, Time to Detect Highlights, Understanding Exporting Normals Algorithm

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I've recently started using the 2024.01 RelightLab release and have noticed a few differences from the 2023.02 release I was using previously.

-The sphere outlines in my scenes are generally circular albeit not perfectly due to camera distortion. Firstly, is it recommended to correct lens distortion in another program (like Photoshop) before processing data in Relight? Secondly, in the 2024.01 release, when I outline the spheres using less than four points, the inner circle in which highlights are detected is much larger but when I define the sphere with a large number of points, this becomes significantly smaller (see attached screenshot). Is there a reason for this? This did not happen in the 2023.02 release.

-Also, what is the significance of the 90 degree axes marks in the sphere defined with many points ("SmallSphereDetail2") and what does the red dot in the upper left corner of the "LargeSphere" image represent?

-All of my datasets are of similar size and quality, but I've noticed that for some, highlight detection progresses rather quickly (a few minutes) while for others it can take hours. What might be causing this difference?

-Lastly, when using the "Export Normals" function after highlights are detected, what algorithm/process is Relight using to create the normals image? At present, the only selectable option is "least squares" but what exactly does that mean? Is it PTM? HSH? Something else?

In case it is relevant, I've been experiencing these issues both on a Windows 10 and Windows 11 computer.

Apologies for my ignorance but I greatly appreciate any help or insight anyone can offer! 





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