Greetings,
No, I haven’t tested the OBS filters.
However, I discovered that the issue was with Unity. After some testing, I realized that I was using the wrong type of material, Lit, instead of Unlit. Additionally, I encountered a peculiar situation where I had to choose “Universal Render Pipeline/Unlit” rather than the standard Unlit option to render the inside of the sphere correctly, despite flipping the normals.
Here are some screenshots comparing the Before (Lit Material) with the After (Unlit Material):
I also want to share another observation. Initially, when I projected the 360º image onto the sphere, I noticed some distorted lines, especially around the plinth. I experimented with changing the shape of the sphere, making it more oval or even flattening some sides, but these adjustments didn’t yield the desired results. What proved to be more effective in reducing distortion was adjusting the size of the sphere. Ultimately, I settled on a diameter of 1f. While I haven’t yet determined a direct correlation between sphere size and lens type, through trial and error, I found that this size minimized distortion the most.
In the images I used to showcase the difference between Lit and Unlit materials, one can also observe the disparity in distortion. In the first image with the Lit material, the distortion in the lines is much clearer, whereas in the second image with the Unlit material, the distortion was significantly reduced.