Rain spots effect spawning on a sampled static mesh, will only spawn on a given mesh directional normal.

For example, if you set your directional normal to 0,0,1 and set the tightness to 0.75, particles should only spawn on faces that are pointing up in the Z axis or close to that given direction.

Contains:

Unreal Engine Version: UEFN, 5.3, 5.4
Effect Type: CPU, GPU
Master Materials: 1
Material Instances: 1
Textures: 1

Parameters:

Spots
Spots – Colour, Spots – Emissive Boost, Spots – Alpha Max, Spots – Alpha Min, Spots – Spawn Rate, Spots – Directional Normal, Spots – Normalized Directional Tightness, Spots – Normal Offset, Spots – Size Min, Spots – Size Max, Spots – Kill Box Enabled?, Spots – Kill Box Size, Spots – Static Mesh,
 

Optimization
Spots – Max Spawn Distance

Component Assets:

Material: VFX Sprite Basic
Texture: Rain Impacts 01
Module: Kill By Normal

Source Files:

Substance Designer File: Rain Impacts 01