So I have a scene where I want it to be raining.
It is a room with 2 windows, the camera points to the windows and looks out. The surrounding buildings are faked by a box enclosing the room. A plane with an emitter particle system generates the raindrops. The materials have Backface Culling enabled so you see the room. The room is closed, the surrounding box has no ceiling.
I have 3 point lights below the rain and above the ground, so it's like a street light and I also have a dim sum light (strength is .5 and the color is dark). Also, I tried adding an HDRI but for some reason, it always appears as light pink.
Problem is, (I think) the environment is dark so the raindrops are not that visible.
The material used for the rain is just a glass BSDF with glossy BSDF (0 roughness) mixed with a mix shader with a factor of 0.8.
How do I make the raindrops more visible?
Also, the raindrops are the slightly dark grey tint on the picture.
The camera view of the window: