All Credits go to benFF as he created the original script for photopost pro.
I manually edited the file to work with Photopost vbGallery.

Download the attached file , upload it to your vbseo_sitemap/addon/ folder.
In your vbulletin settings vBseo Google/yahoo sitemap settings add vbseo_sm_vbagallery.php to your Addon Generator Modules and save your settings.

Edit php file and change $gallery_url = according to your gallery folder

If you are using Photopost vBGallery v2.0 or v2.1 download vbseo_sm_gallery1.php otherwise you can still use the old one.

This mod also works for vB 3.6.x

For vBSEO users if you use CRR (Custom Rewrite Rules) for your gallery you may modify the file to work with your CRR's. Here is the url example :

Categorie Links (don't forget to change the url's to match your CRR's)

Image Links (don't forget to change the url's to match your CRR's)