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Simple Painter

Simple Painter is a GPU-accelerated runtime paint system for Unity, built on a two-tier architecture: a GPU Command Pipeline for high-performance rendering and a Paint Node Hierarchy for clean lifecycle management.

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Optimized for both real-time performance and high-fidelity rendering with a zero-allocation design. All paint commands are batched and dispatched through a single CommandBuffer per frame.

🎨 Key Features​

  • 🔧 GPU Command Pipeline: Singleton PaintEngine batches all GPU commands into a single CommandBuffer, minimizing draw call overhead and maximizing throughput.
  • 🌊 Real-time Fluid Simulation: Three simulation tiers to match your fidelity needs — FluidShallow (height-field gravity flow), FluidViscous (SPH solver), and FluidParticle (full MLS-MPM).
  • 🖌️ Multi-Channel PBR Painting: Paint across Albedo, Normal, Metallic, and Roughness channels simultaneously, with per-layer blend modes for professional material authoring.
  • ⚡ Zero-Alloc Design: CRTP-based object pooling for all command types and CommandBufferPool reuse ensure zero GC allocation during painting.
  • 🎯 Flexible Input Pipeline: Three trigger types (Raycast, Collision, Particle) combined with four stroke methods (Bézier, Line, Dot, Anchored) cover every input scenario.
  • 🧩 Strategy Pattern Architecture: Hot-swappable tools, stroke methods, and committers allow runtime reconfiguration without code changes.

🎯 Project Vision​

Simple Painter bridges the gap between simple texture stamping and complex fluid simulation systems. It offers:

  • Artistic Control: Intuitive component-based setup that designers can configure without writing code.
  • Technical Excellence: Clean SOLID architecture with interface-driven design for developers to extend.
  • Performance: GPU-only rendering pipeline with zero GC allocation, even during fluid simulation.

Next: Getting Started