In this Unreal Engine tutorial, learn how to use the Section Filter in Niagara’s Static Mesh Location module! If your mesh has multiple material elements and you only want particles to emit from specific sections rather than the entire mesh, the Section Filter makes it easy.
https://dev.epicgames.com/community/learning/tutorials/Zdlxv/unreal-engine-mastering-section-filter-in-ue-5-1-with-niagara-static-mesh-locations