Volunex – OpenVDB & Volumetric Effects Suite for HDRP

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Volunex – Advanced Volumetric Effects for HDRP Create cinematic volumetric clouds, smoke, explosions, tornadoes, atmospheric effects, animated OpenVDB sequences, and real-time GPU fluid simulations directly inside Unity. Volunex is a volumetric rendering and effects toolkit designed for artists, environment designers, VFX creators, and developers working with HDRP. It combines OpenVDB conversion, Texture3D volume rendering, procedural volume generation, animated volume sequences, interactive volumetric effects, particle-system integration, and a real-time GPU fluid simulation framework in one package. OpenVDB Importing Import OpenVDB density volumes into Unity using the built-in Volunex VDB conversion workflow. Features include: • Import .vdb density files • Select a density grid by name • Automatic scalar-grid fallback • Numbered VDB sequence detection • Animated sequence importing • Adjustable sequence frame rate • Automatic active-volume bounds detection • Aspect-ratio-preserving conversion • Conversion to Unity Texture3D assets • R8 density storage for practical runtime rendering Volunex converts sparse OpenVDB grids into dense Unity Texture3D assets optimized for use with its real-time raymarch renderer. The optional editor conversion backend uses Python, OpenVDB and NumPy packages installed through the included backend installer. Procedural Volume Editor Generate volumetric effects without requiring external VDB files. Available generators include: • Clouds • Smoke • Tornadoes • Explosions • Heightmap-based volumes • Imported Texture3D sources Available procedural noise modes include: • Perlin • Worley • Ridged • Hybrid Create individual volumes or animated Texture3D sequences directly in the Unity Editor. Real-Time Volume Rendering Volunex renders volumetric density using an HDRP-compatible raymarching shader. Rendering controls include: • Adjustable raymarch steps • Empty-space skipping • Density control • Light absorption • Edge fading • Directional lighting • Local light support • Emissive volumes • Density-shaped shadows • Shadow softness and quality controls • Wind animation • Unity WindZone integration The system is suitable for clouds, smoke, fire-like effects, magical volumes, dust, atmospheric effects, and other volumetric visuals. Animated Volume Sequences Create and play animated Texture3D sequences. Features include: • Adjustable playback speed • Sequence frame rate • Play and stop controls • Randomized sequence starting time • Frame interpolation • Runtime sequence playback Animated sequences can be used for smoke simulations, explosions, tornadoes, clouds, and other pre-generated volumetric effects. Interactive Volumes Volunex volumes can react to gameplay. The included interaction system supports projectile and explosion-style density carving. Examples include: • Bullets passing through smoke • Temporary holes in cloud volumes • Explosions dispersing local density • Interactive volumetric gameplay effects • Automatically recovering density after interaction Interaction strength, radius, softness, duration and recovery can be customized. Particle System Integration Use volumetric assets with Unity Particle Systems. Volunex can render particles as individual volumetric instances using Texture3D density or animated volume sequences. Create effects such as: • Volumetric smoke particles • Explosion clouds • Dust bursts • Fireballs • Destruction smoke • Magical effects • Atmospheric particles Controls include density, absorption, raymarch quality, emission, shadows, size, and opacity over lifetime. Destruction Effects The included destruction smoke component can emit volumetric smoke effects from collisions or scripted events. This makes Volunex suitable for destruction systems, impacts, environmental effects, explosions, and gameplay VFX. Real-Time GPU Fluid Simulation Volunex also includes an experimental real-time 3D GPU fluid simulation framework. The simulation includes: • 3D velocity fields • Density simulation • Temperature simulation • Semi-Lagrangian advection • Buoyancy • Vorticity confinement • Divergence calculation • Jacobi pressure solving • Pressure projection • Fluid emitters • Directional, point and vortex forces • Collider obstacle support • GPU raymarch rendering The fluid solver is designed for real-time smoke and fire-style volumetric effects. Quality presets can be adjusted according to the target hardware and required visual quality. Fluid Simulation Components Volunex Fluid Volume Controls the GPU simulation and rendering volume. Volunex Fluid Emitter Injects density, heat and velocity into the simulation. Volunex Fluid Force Adds directional, point or vortex forces to the fluid. Volunex Fluid Collider Adds collider-bound obstacle regions to the simulation. Included Demo Content Volunex includes ready-to-use examples and generated test assets: • Main Volunex demonstration scene • Fluid simulation demonstration scene • Procedural cloud density asset • Animated procedural smoke sequence • Generated tornado sequence • Perlin noise texture • Cellular noise texture • Ridged noise texture • Turbulence noise texture • Radial volume mask • Plume mask • Heightmap test textures • Example materials and shaders Editor Workflow Volunex adds convenient tools under: Tools > Volunex Available tools include: • Setup • Create Volume in Scene • Procedural Volume Editor • Import OpenVDB • Fluid Simulation tools The package is designed to provide both artist-friendly editor workflows and runtime scripting access. Performance Controls Volume rendering quality can be adjusted through raymarch step counts, shadow samples, empty-space skipping and density settings. The GPU fluid solver also supports adjustable simulation resolutions. Recommended starting fluid resolutions: Low: 32³ Medium: 64³ High: 96³ Ultra: 128³ Start with Medium quality and increase resolution according to target GPU performance. Requirements • 2021.2.x to 6000.3 • High Definition Render Pipeline (HDRP) • Compute Shader capable GPU for real-time fluid simulation • 3D texture and UAV support for GPU fluid features The OpenVDB importer uses an optional editor-side conversion backend. The backend installer downloads the required Python, OpenVDB and NumPy packages into the project's Library environment. No OpenVDB runtime dependency is required for already-converted Texture3D assets. Ideal For • Environment artists • VFX artists • Cinematic scenes • FPS and action games • Destruction effects • Atmospheric environments • Horror games • Sci-fi effects • Clouds and weather effects • Smoke and explosion effects • Prototype and research projects Volunex provides a flexible foundation for bringing high-quality volumetric effects and OpenVDB-based workflows into HDRP. • OpenVDB .vdb density importer • Animated VDB sequence importing • VDB to Unity Texture3D conversion • HDRP volumetric raymarch renderer • Procedural cloud generator • Procedural smoke generator • Tornado generator • Explosion volume generator • Heightmap-driven volume generation • Perlin, Worley, Ridged and Hybrid noise • Animated Texture3D volume sequences • Frame interpolation • Directional and local lighting • Density-shaped shadows • Emissive volumetric effects • Wind and WindZone support • Responsive obstacle system • Projectile and explosion volume interaction • Recovering density-carve effects • Unity Particle System volumetric renderer • Destruction smoke support • Real-time 3D GPU fluid simulation • Density, temperature and velocity simulation • Buoyancy and vorticity confinement • GPU pressure solver • Fluid emitters • Fluid forces • Fluid collider obstacles • Adjustable rendering and simulation quality • Demo scenes and example assets included Volunex is designed for the High Definition Render Pipeline (HDRP). HDRP: Supported URP: Not supported Built-in Render Pipeline: Not supported The package uses HDRP-compatible volumetric raymarching shaders, 3D textures and GPU compute shaders. A compute-shader-capable GPU is required for the real-time fluid simulation features.