Create Amazing VFX with the Visual Effect Graph
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The document discusses the Generative Art project made with Unity, focusing on a next-generation visual effect tool that utilizes a node-based interface for creating and managing visual effects. It covers various technical aspects including authoring behavior, editing features, and the production pipeline while also highlighting scalability and integration with other tools. The project aims to enhance the visual effects capabilities of artists working within Unity, supporting advanced features like particle simulation and shader integration.
Create Amazing VFX with the Visual Effect Graph
- 1. GenerativeArtโMadewithUnity Visual Effect Graph 1 Julien Fryer Graphics Programmer, Unity [email protected] Vlad Neykov Graphics Test Engineer, Unity [email protected]
- 4. 4 Next Generation Visual Effect tool for Unity Tailored for Next-Generation platforms (GPU/Compute) Self contained template Assets with Event and Parameter interface Programmable, hybrid Stack/Node-Based Effect behaviors What is the Visual Effect Graph?
- 5. 5 Industry trend Scalability of effects Artist friendly tool Scalability of features SRP High Definition Render Pipeline
- 6. 6 CPU GPU PARTICLE COUNT Thousands Millions SIMULATION Simple Complex PHYSICS Underlying Physics System โข Primitives โข Scene Representation (SDFโฆ) โข Depth Buffer GAMEPLAY READBACK Yes No* * Potentially small data with latency OTHER Can read Frame Buffers- GPU vs CPU Particles
- 8. 8 VFX Asset Authoring โ Author Behaviors โ Define Events โ Setup Parameter Interface 1 0 Asset Instance Configuration โ Edit Parameters โ Call Events โ C# Scripting 2 VFX Feature Creation/Editing โ Author New Features โ Improve Library Layers of Editing
- 11. How many particles? What are their initial values? How do they behave over time? How are they rendered? Contexts Events, Spawner Chaining, GPU Events, Custom Spawner Behaviors Quad, Line, Point, Mesh, Multiple Outputs 11
- 13. 13 FX Compilation VFXGraph: Scriptable Objects hierarchy stored as sub assets โ Shaders (compute for simulation, vs/ps for rendering) โ Bytecode for the VFX CPU interpreter (flattened CPU part of expression graph) โ Optimized Data layout (only necessary attributes are stored) โ PropertySheet: input values and exposed parameters description โ List of VFX Systems descriptions < Expression Graph
- 14. 14 Expression Graph High level use case Shader Code CPU bytecode Constant folded
- 15. 15 Compilation 2 Version of compiled data โ Edit time โ All editable values in the graph are available for edition without recompilation โ Additional debug and profiling data โ Runtime โ Optimized low level graph, everything that is not exposed is constant folded โ Constants directly inserted in shaders
- 17. 17 Pipeline โ VFX Toolbox (Flipbook generator) โ Point cache from meshes โ Future: Flowmap, Vector Field, Signed Distance Field, etc. โ External DCC (Houdini)
- 18. Live Demo 18
- 20. 20 Down the road โ Shader Graph integration โ Subgraphs โ CPU particles โ Trails, etc.
- 21. GenerativeArtโMadewithUnity Questions? 21 Julien Fryer Graphics Programmer, Unity [email protected] Vlad Neykov Graphics Test Engineer, Unity [email protected]