For more information, head over to https://learn.foundry.com/course/6628...
For User and Reference Guides, as well as more tutorials, head over to https://learn.foundry.com/nuke By using the GeoSelect Node, you are able to save and reuse selections on 3D objects. These saved selections can then be repurposed as emitters for particles or point clouds, or used for snapping objects to the same areas repeatedly.