Check the fantastic work on Porsche Cayman GT4, by Daniel Mozbäuchel.
Daniel Mozbäuchel is a Freelance CGI, 3D-Artist and Generalist. In this project used Cinema 4D, Octane 3, Particles, And BlackMagic Design’s Fusion for Compositing.
The rain scene is beautiful, the render also has an interesting raindrop texture effect pretty realistic.
In the scene Daniel created a 4K raindrop texture, that he could use into the shader as displacement.
Daniel has made the 4K raindrop texture loop free for download.