I have found a half way decent way to make 360 degree backgrounds for Silvam's great updates for OOTP21. I am doing historic first. I am no doing any that you can't see the backgrounds, e.g. coliseums, enclosed domes, etc.etc.
These are the ones I am uploading today:
American_League_Park_I_1901-1903_v1_4
American_League_Park_II_1904-1910_v1_4
Angel_Stadium_1966-1978_v1_4
Buffalo_Soldiers_Field_v1_4
Civic_Stadium_v1_4.
These are far from perfect but the best I can do, so far, with Setchup. I have used Google Earth to make the backgrounds. I have yet to find satellite photos for any historic parks, current backgrounds will have to do. You may also note as you scan around the park that there are some repeats and stretch/smear areas. That is what happens when making panoramic back grounds in Sketchup. I have not found a way to keep that from happening. I also have not been able to find a way to make the parks look like they are on ground level, yet.
In my opinion, these backgrounds are better than sky boxes. But is some of his historic parks may have sky boxes I may just leave them alone.
Making these backgrounds is tedious and time consuming. So, I will post more as I get them done.
I have added these as an addition to Silvam's parks. So mine will have newer dates. If you don't want to overwrite his. just change the file name on mine, e.g. add 'new" to the end, before you copy it to your Models folder.
I am open to any feedback or suggestions, positive or negative.
In case you are wondering, Buffalo Soldiers Field is what I use for my PT teams.
Here is the link:
https://www.mediafire.com/folder/akd2ejkdtk4dx/