AA Grass Pro | Realistic & Stylized Grass Shader

AA Grass Pro is an industry-grade, high-performance GPU foliage and grass rendering engine designed for Unity URP & HDRP—eliminating CPU bottlenecks and draw call overhead while delivering photorealistic vegetation for open-world games!

Render dense, organic foliage instances directly on the GPU with 3D V-keel blades, real-time shadow receiving, seamless multi-tier LOD blending, physical trampling trails, and dual-sided BSDF translucency in seconds.

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Online Documentation..

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KEY FEATURES:

• 3D V-Shape Keel Blade Architecture: Procedural 3-vertex cross-section with an indented central keel spine and outward-flaring cylindrical curvature normals, delivering realistic volume, thickness, and soft wrap-around specular highlights.

• Dynamic Shadow Receiving (HDRP & URP): Directional sunlight and scene shadow casters are received directly on foliage with automatic two-sided normal bias correction (SHADOW_AUTO_FLIP_NORMAL) for crisp, clean shading.

• Single Indirect Draw Call Pipeline: Draws massive grass fields via GPU compute instancing (Graphics.DrawMeshInstancedIndirect), bypassing GameObject transform overhead and CPU memory limits.

• 4-Tier Continuous LOD System: Smooth distance-based density ramps, soft ground-level dissolves, and blade width compensation eliminate visible concentric transition rings and popping.

• Volumetric Fog Depth Synchronization: Fully synchronized HDRP Depth Prepass (DepthForwardOnly) integrates seamlessly with native atmospheric scattering without horizontal slicing artifacts.

• Modern Master Toggle UI & Global Reset: Streamlined Inspector featuring iOS-style toggle cards for Wind, LOD, and Physics, per-section resets, and a top-right global ↺ Reset All button with safety confirmation.

• Analytical Multi-Collider Physics: GPU mathematical collision formulations for Spheres, Capsules, Oriented Boxes, and Wheels with elastic recovery and UV-offset trail blitting to prevent ghosting.

• Procedural Dual-Frequency Wind: Dynamic vertex-shader wind engine with directional breeze, traveling wave propagation, tip turbulence, and surging gusts without requiring scene WindZones.

• Dual-Sided BSDF Plant Shading: Custom HLSL plant tissue lighting with dual-sided rendering (Cull Off), subsurface transmission (SSS), cylindrical curvature normals, and root-to-tip 3-tier color ramps.

• Interactive Viewport Brush Painter: Dedicated scene-view painting tool with surface isolation, continuous stroke throttling, dynamic radius scaling, and instant eraser mode.

• Zero Terrain Dependency: Paint freely on any static mesh, moving platform, procedural geometry, or organic rock equipped with a standard Unity Collider.

• Auto-Detect Setup Workflow: Automatically locates and links compute shaders and material assets upon adding the component—zero null reference setup hassle.

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COMPATIBILITY:

• Compatible with Universal Render Pipeline (URP) and High Definition Render Pipeline (HDRP).

• Demo Scene: The included demo scene is built and pre-configured in HDRP. For URP projects, simply assign the included URP grass shader/material variant.

• Supports Unity 2022.3 LTS, Unity 2023, and Unity 6+.

• Cross-platform support across PC (DirectX 11/12, Vulkan), Mac (Metal), Linux, and Current-Gen Consoles (PlayStation 5, Xbox Series X/S).

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AI DISCLOSURE & TRANSPARENCY

This asset contains 100% human-crafted C# source code and hand-designed architecture. No generative AI code, AI-generated images/textures, or third-party synthetic assets were used in the creation or runtime operation of this package.

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