Water on camera lense effect

I’ve been playing around with problem evening, specifically trying to make it as procedural as possible - i.e. not having to rely on animated textures to do the droplet formation and dissipation.

is the shading graph I’ve come up with:


However, there seems to be a problem with the way the Noise procedural and the SceneTexture interact, since I end up with :


Its odd, all the droplets are aligning themselves to the normals of the objects in the scene, not the camera… Any ideas how to get around ?