About Fluid Frenzy

Key Features Contents Requirements Limitations Pipeline Support Platform Support Feature Support

Installation

Package Manager Unity Package File

Samples

Importing Samples Universal Render Pipeline Running Samples River Grand Canyon Water Modifiers Volcano Terraform Fossil Finder Pool Simple Terraform Tiled Simulation Runtime Setup GPULOD Terrain Scene Configuration

Setup

Simulation Time Step Water Simulation Terraform Simulation Simulation Regions Fluid Channels Shader Stripper GPULOD Displacement Waves Flow Mapping Ocean FFT Cascades Sampling Universal Render Pipeline High-Definition Render Pipeline

Fluid Frenzy Toolbar

Accessing the Toolbar Simulation Preview Modes Sculpt Mode (WIP) Modifier Mode Shared Settings Terrain or Fluid Layer Splat Channels Blend Mode Tool Properties

Fluid Simulation Components

Fluid Simulation Terrain and Obstacle Input Boundary Conditions Side Border Settings Domain Solver Initial Conditions Terrain & Ground Simulation Culling Extension Layers Create Collider Fluid Simulation Settings Creation Properties Second Layer Flux Fluid Simulation The Pipe (Flux) Model Simulation Characteristics Flux Fluid Simulation Settings Creation Specialized Flux Properties Flow Fluid Simulation The 2D Height Field Model Performance and Stability Solver Ocean FFT Coupling Flow Fluid Simulation Settings Creation Specialized Flow Properties Foam Layer Foam Layer Settings Foam Render Settings Foam Decay Settings Foam Pressure Settings Foam Wave Settings Shallow Foam Settings Turbulence Foam Settings Wetness Layer Wetness Layer Settings Rendering Settings Decay Settings Fluid Flow Mapping Fluid Flow Mapping Settings Erosion Layer Multi-Layer Terrain System Terrain Modification Processes Erosion Settings Terraform Layer Liquefaction (Solid Terrain to Fluid) Fluid Contact Reactions (Fluid and Terrain) Fluid Mixing (Fluid + Fluid to Solid Terrain) Fluid Contact Reaction Terraform Settings Terrain Modifier Terrain Modifier Settings Terraform Modifier Fluid Particle Generator Splash Particles Surface Particles Fluid Particle System Fluid RigidBody Prerequisite Fluid Density Calibration Interaction Calculation Fluid Displacement Profile Fluid Interaction Profile Fluid RigidBody Lite Fluid Floater Fluid Simulation Obstacle Settings Fluid Event Trigger

Fluid Rendering Components

Fluid Renderer Fluid World Renderer Fluid Renderer vs Fluid World Renderer Setting up a tiled world Which simulations are included General Mesh Rendering Water World Renderer Ocean FFT Settings Surface Renderer Render Properties Detail Wave Effect Detail Wave Settings HDRP Water Surface Properties Water Rendering Water Surface Underwater Effect Underwater Settings Current Particles Current Particle Settings Wet Lens Effect Wet Lens Settings Caustics Effect Caustics Settings Surface Reflections Fluid Decal Renderer Lava Lava Surface Under Lava Effect Shadows HDRP Water System

Fluid Shaders

Water Shader Stylized Water Shader Toon Water Shader Lava Shader Particle Shaders Fluid Decal Shader

Terrain

Simple Terrain Terraform Terrain Terraform Terrain Shader Terraform Terrain (Single Layer) Shader

Fluid Modifiers

Fluid Modifier Volume Fluid Source Settings Fluid Flow Settings Fluid Force Settings Fluid Modifier Waves Fluid Modifier Pressure Foam Modifier

C# Interaction & Scripting

Fluid Simulation Manager Simulation control Adding fluid Applying flow and forces Sampling the simulation Creating simulations, modifiers, and obstacles Simulations Surfaces In-memory settings Extension layers Terraform terrain and simulation Editor presets Fluid modifiers Terrain and terraform brushes Obstacles

Using ShaderGraph

Fluid Simulation Nodes Terraform Terrain Nodes Particle Nodes Current Displacement Shaders

Tiled Simulations

Purpose Setup Padding for Continuity

Physics Colliders

Surface Collider GPU-CPU Synchronization and Performance Collider Properties

Simulation Debugger

Edit Mode Preview

AI Skills

How to use them

Third-party Support

Enviro 3 Sky and Weather COZY: Stylized Weather 3 Curved World

Future Updates & Roadmap

Fluid Frenzy: 2026 Development Roadmap Roadmap Overview Upcoming Feature Breakdown Old Roadmap

Using ShaderGraph

Create your own shaders using ShaderGraph and the Fluid Frenzy ShaderGraph nodes. You can create custom shaders for the Fluid Simulation, Terraform Terrain, and Procedural particles. To get started it is recommended to look at the example shader found at FluidFrenzy\Runtime\Rendering\Shaders\ShaderGraph\SampleFluidSimple. This example demonstrates how to sample the fluid simulation’s data like the height, depth. velocity, layer, normals and how to apply flowmapping.

Fluid Simulation Nodes

Node Description
ApplyClipSpaceOffset Applies a depth offset to the clipspace position
ClampVector2 Clamps a Vector2 to a given length
ClipFluid Calls hlsl clip to discard any invisible fluid layer’s pixels.
EvaluateWaterFoamMask Evaluate the visibly of the foam based on factors like the selected mode, albedo, and foam mask.
FluidClipHeight Shader subgraph for fluid clip height
FluidUV0To1 Returns the 0 to 1 UV based of the FluidUV from the SampleSimulationData node.
FluidUVGrid Returns the Grid UV based of the FluidUV from the SampleSimulationData node. This UV matches the Unity Terrain height sampling UV.
LayerToMask Converts the layer data from the SampleSimulationData to a -1 to 1 mask.
SampleFoam Samples the fluid simulation’s foam mask.
SampleWetness Samples the residual Wetness Layer mask at a fluid UV.
SampleWetnessFromPositionWS Samples the residual Wetness Layer mask at a world-space position. Uses the world wetness atlas when a Water World Renderer is active.
SampleHeightVelocity Samples the fluid simulation’s height and velocity data.
SampleNormal Samples the fluid simulation’s surface normal.
SampleSimulationData Samples all the fluid simulation data at a provided UV coordinate.
SampleSimulationDataFromPositionOS Samples all the fluid simulation data at a provided object space position.
SampleSimulationDataFromPositionWS Samples all the fluid simulation data at a provided world space position.
SampleTerrain Samples the terrain height used in the fluid simulation.
SampleTex2DFlow Samples the provided texture using the selected flow mapping technique.
SampleTex2DFlowDynamic Samples the provided texture using the dynamic flow mapping technique.
SampleTex2DFlowStatic Samples the provided texture using the static flow mapping technique.
SampleVelocity Samples the fluid simulation’s velocity data.
SampleVelocityFromPositionWS Samples the fluid simulation’s velocity at a world-space position.
FluidCurrentDisplace Vertex offset that leans a mesh or grass blade with the fluid current. Strength, stop depth, falloff, and sway control how far it bends.
UVToBorderMask Convert the UV into a soft border fading to black on the edges.
UVToBorderMaskInverted Convert the UV into a soft border fading to white on the edges.

Terraform Terrain Nodes

Node Description
SampleHeightMap Samples the Terraform Terrain Heightmap.
SampleLayers Samples and blends all the layers of the Terraform Terrain shader based on the splatmap mask.

Particle Nodes

Node Description
SampleParticleData Samples the particle simulation’s graphics buffer to retrieve it’s data.
SampleParticleVertexData Sample the vertex position’s of the particle.
TransformParticleToBillboard Transform the particle and particle vertex data into a billboard.

Current Displacement Shaders

These Shader Graph shaders bend grass and meshes with the Fluid Simulation current. Vertices lean from the object pivot (or grass tuft root) along the flow, with a small sway so the motion is not a straight sine wave. Displacement fades with water depth: fully bent near the surface, stopped at Stop Depth.

Use the ready-made graphs, or drop the FluidCurrentDisplace subgraph into your own Shader Graph.

Grass (FluidFrenzy/FluidCurrentGrassLit, FluidFrenzy/FluidCurrentGrassUnlit) is for terrain mesh details and painted tufts. Vertex color RGB tints the blade. Vertex color alpha scales how much that vertex leans (keep 0 at the root). Both Transform nodes on the subgraph must stay on Offset; Direction skips GPU-instance matrices and makes tufts sway the wrong way. Built-in terrain mesh details need the Unlit graph. The Lit graph is PBR on Built-in and URP.

Mesh (FluidFrenzy/FluidCurrentMeshLit, FluidFrenzy/FluidCurrentMeshUnlit) is for MeshRenderers such as seaweed. Keep both Transform nodes on Direction. Texture alpha drives cutout.

Example prefabs and materials live in FluidFrenzy\Runtime\Presets\Prefabs\Current and FluidFrenzy\Runtime\Presets\Materials\Current.

Current Displacement Settings

Property Description
Base Map Albedo texture. Grass multiplies this by Color and vertex RGB. Mesh uses texture alpha for cutout.
Color Tint multiplied with the base map.
Smoothness Surface smoothness on the Lit graphs. Unlit ignores this.
Current Strength How far vertices lean with the current.
Stop Depth Water depth in meters where current displacement fades out.
Falloff How quickly the lean fades as depth approaches Stop Depth.
Sway Extra side-to-side meander on top of the current lean.
Sway Speed How fast the sway animates.
Alpha Clip Threshold Cutout threshold. Grass also dithers with camera distance.
Fade Start Grass only. Distance where the blade starts to fade.
Fade End Grass only. Distance where the blade is fully faded.