This material set is used for rain flow effect on surfaces like glass windows or solid surfaces. Scene is included.
Technical Details
Warning: Because of a bug stated here, material overlay volume doesnt work right on 4.22 and 4.23. That bug fixed on 4.24.2.
General flow speed: Set 0 to stop all flowing.
Mask general flow speed: If general flow speed is not 0, this will set the general speed of vertical flow piles.
Bottom layer flow speed: Set 0 to stop 1/3 of drops.
Bottom mask flow speed: This will set the partial speed of vertical flow piles on bottom layer. Set it 0 to hide 1/3 of vertical flows.
Middle layer flow speed: Set 0 to stop 1/3 of drops.
Middle mask flow speed: This will set the partial speed of vertical flow piles on middle layer. Set it 0 to hide 1/3 of vertical flows.
Top layer flow speed: Set 0 to stop 1/3 of drops.
Top mask flow speed: This will set the partial speed of vertical flow piles on top layer. Set it 0 to hide 1/3 of vertical flows.
IOR: Index of refraction value
Opacity-control: Material opacity value
Specular amount: Material specular value
Static speed: This value will set the flow speed of tiny drops between static drops.
Static drop on?: Set it to 1 for horizontal surfaces that has no flow. (General flow speed must also set to 0)
Static drop speed: This is the refresh rate of changing positions of the drops which looks like rain fall on surface.
UV multiplier: Tile multiplier of the general Material.
Original_Link: https://www.unrealengine.com/marketplace/en-US/product/animated-rain-waterdrop-material
