Advanced Screen-Space Fluid Simulation
For projects targeting the Universal Render Pipeline, RaindropFX Pro URP 1.8 Unity offers a highly optimized approach to lens-based weather effects. At 2.5.1, the asset leverages both CPU and GPU solvers, allowing developers to balance the load based on their target hardware. The GPU solver is particularly effective for high-density rain screen-space effects, as it minimizes the overhead on the main thread, while the CPU solver provides the precision required for complex physics-based droplet paths.
Integration Tips
- Renderer Feature Setup: This asset requires adding a specific Scriptable Render Feature to your Forward Renderer asset. Don’t forget to check the ‘Opaque Texture’ and ‘Depth Texture’ boxes on your URP Pipeline Asset, or the refraction shaders won’t have a background buffer to sample from.
- Post-Processing Order: Ensure the RaindropFX is rendered after Bloom but before Film Grain in your volume stack to maintain the visual clarity of the droplets without them being blurred out by heavy HDR effects.
- Object Space Application: Beyond the camera, you can apply these shaders to world-space meshes (like window panes). Use a low-poly proxy mesh for windows to keep draw calls low while still benefiting from the dynamic wipe effects.
Best Use Cases
- Racing Simulators: The radial wind support is a game-changer here. By tying the wind turbulence parameters to the vehicle’s velocity vector, you create a realistic ‘streaking’ effect on the camera as the car accelerates.
- First-Person Horror: The screen fog and liquid simulation can be tinted. Using this for ‘blood on the lens’ or toxic sludge effects adds an extra layer of visceral feedback that standard particle systems can’t match in URP.