I`m trying to use mesh params from bp to make particle deform from one mesh to another. My solution was to create two meshs objj parameters in Niagara, with the source mode of the source mesh (which the particles departed) to “Attach parents” and the another(which particles are going to reach) to “Source”.
IThen in the blueprint I attach the source mesh under niagara component, and position the target mesh comp and niaraga comp at the same hierarchy level, then use “Set niagara static mesh component” to send target mesh comp to niagara.
It works for me in UE5.4, hope it helps somebody~