TerraOptimizer

TerraOptimizer is a high-performance GPU vegetation renderer designed for large open-world environments in URP, HDRP and Built-in pipelines.

It automatically imports terrain trees/details, replaces Unity’s CPU-heavy renderer, and generates SRP-Bound indirect instances with LOD, billboards, impostors, deterministic density logic, and procedural scatter.

Shader Graph Notice: Graph-made shaders cannot be patched automatically (by Unity limitation). For these shaders, TerraOptimizer switches to a universal GPU bridge shader to preserve color, albedo and cutout without user intervention.

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Focused on scalability, predictability and full runtime control, TerraOptimizer brings modern rendering to Unity vegetation.

FEATURES

• GPU-Native Vegetation Rendering

A fully indirect, SRP-Bound render pipeline that runs entirely on the GPU.

No DrawMeshInstanced calls, no CPU overhead, no manual material setup.

• Deterministic Terrain Import

Trees and details are automatically imported from Unity Terrain with identical placement every time.

Same seed = same world, even across rebuilds and multiple terrains.

• Auto Material Patch + Universal Shader Bridge

Materials are converted automatically without editing, duplicating or reauthoring shaders.

Unsupported or Shader Graph materials seamlessly switch to a universal GPU bridge while preserving albedo, tint, cutoff & normal detail.

• Full LOD Chain + Dynamic Billboards

Mesh LOD0–2 plus automatic LOD3 billboards with atlas-free textures.

Billboards use shared quad meshes and GPU instancing for zero-memory overhead.

• Multi-Terrain Ready Streaming
  Works seamlessly with single or multiple terrains in one scene. A single manager object handles unified culling, LOD and vegetation streaming across all assigned terrains.

• Per-Prefab Density, Scale & Rules

Each vegetation source can override density, size, random yaw, and placement rules.

Slope, splat and elevation filters shape biome patterns with precision.

• Open Source

All core editor and runtime scripts are included as readable C# source, with no DLL lock-in. You can inspect, modify and extend the entire system for your own projects.