Terrain Interaction Toolkit

Terrain Interaction Toolkit solves the fundamental problem that Unity terrain details—grass, rocks, vegetation—cannot be interacted with during gameplay. They exist purely as visual decorations rendered by the terrain system. This toolkit enables dynamic interaction with terrain foliage by converting detail layers into real GameObjects or lightweight runtime placeholders that can be collected, destroyed, animated, or modified through physics and gameplay logic.

The toolkit provides two distinct conversion workflows. The first converts terrain details into fully instanced GameObjects in the editor or at runtime, giving complete control over meshes, materials, colliders, and scripting. The second generates invisible runtime placeholders that maintain terrain rendering while enabling interaction through a grid-based culling system designed for performance. When a placeholder is interacted with, the corresponding terrain detail is removed from the underlying detail map in real time.

Both systems include backup and restoration workflows that preserve original terrain state. Backups use GUID-based validation to prevent mismatched restorations across scenes, terrain assets, and converter instances. The toolkit works seamlessly in multi-terrain environments through centralized management and batch operations.

Beyond detail conversion, the toolkit includes a tree cutting system that slices tree meshes at arbitrary heights in the editor. It separates trunk geometry from foliage, generates procedural cap geometry at the cut plane, and reassembles the pieces into gameplay-ready stump and falling tree assets with optional physics colliders.

The Elemental system extends the toolkit with environmental interactions across fire, snow, and rain. Fire simulation uses performance optimized GPU-accelerated propagation driven by terrain texture fuel data and wind parameters. Snow accumulation renders through shader-driven depth maps with support for footprint deformation synchronized to animation events. Weather effects integrate through a unified hub that controls global wetness, puddle formation, and exclusion zones for covered areas. All Elemental shaders support Built-in, Universal, and High-Definition Render Pipelines.

A centralized editor window consolidates setup workflows, conversion controls, tree cutting tools, Elemental integration, and backup management. The window validates terrain configurations, guides multi-step processes, and provides real-time feedback on system status.

Unity 6 compatible.