This procedural rain generation system creates animated precipitation, splashes, and associated water ripples. The geometry nodes setup calculates collisions, allowing rain particles to bounce off walls and objects within the scene. It calculates particle position data in world space, which means the main emitter object can be moved throughout a scene without abruptly shifting the position of already falling rain. Additionally, users can randomize the rain direction and adjust the animation frame rate, such as animating on twos for stylized motion.