Rain Fx in Houdini by Kamran Khan Wazir

Want rain that actually reads as wet and heavy on screen? This tutorial walks you through a full production-style setup for cinematic rain in Houdini — from falling rain to splashes, flowing water on a car, and the final render.

🎯 What you’ll learn

• Rain setup using POP simulation with proper speed, direction, and variation
• Splash creation on impact for believable ground and surface hits
• FLIP simulation for water flowing over a car body
• Droplets and ripple solver details for added realism
• Lighting and rendering in Solaris with Karma for a cinematic look

✅ Requirements

• Skills: Basic understanding of Houdini UI and SOPs, familiarity with simulation concepts
• Tools: Houdini with Solaris and Karma enabled
• Hardware: System capable of running POP and FLIP simulations, minimum 16GB RAM, dedicated GPU recommended

📝 Description

This is a straight-to-the-point workflow, no fluff. You start with a POP simulation to get the rain fall itself — count, streaks, wind drift, and how to keep it cheap enough to iterate. It is about making rain that works for camera, not just particles in a viewport.

Then you sell the contact. You will build impact splashes, add droplets, and use a ripple solver so surfaces feel wet instead of just getting hit by points. The big piece is the car: you run a FLIP simulation so water actually flows over the panels, pools in the right spots, and breaks up naturally.

To finish, everything moves into Solaris for lighting and rendering with Karma. You will set up moody cinematic lights, get those wet reflections and streak highlights, and put out a shot that holds up in a reel.

🧑‍🎓 Who this course is for

• Houdini users with basics down who want to add weather and water FX to their work
• FX artists and generalists who need a practical rain setup for cars, streets, and cinematic shots

🧑‍🏫 About the Author

Kamran Khan Wazir is a Houdini artist focused on practical FX workflows and step-by-step tutorials. He breaks down POP and FLIP setups into repeatable production moves, with an eye on what actually renders well in Karma.

🏁 Final Result

• A cinematic rain shot featuring a car with FLIP-based water flow, POP rain, splashes, droplets and ripples, lit and rendered in Solaris with Karma