Deformable Snow & Ice Shader — Trails, Footprints, Terrain
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Interactive snow & ice material with footprints, vehicle trails, tessellated snow and deep-cracked glossy ice. Supports URP, Built-in, terrains and drag-and-drop prefabs.Bring winter scenes to life: anything that moves leaves trails in deep, soft snow. Snow piles up at the edges of each trail and slowly fills back in over time. Snow and frozen ice share a single material, so you paint where the ice goes. It works in URP and the Built-in pipeline, on meshes and on Unity Terrain.Key FeaturesInteractive trails. Emitters, footprints, particle systems or a single script call push the snow down, and the snow rises around the trail.Tessellation only on snow, near the camera. A fallback without tessellation is included for older hardware.Snow + ice in one material, painted with the built-in Splat Painter or with vertex colors.Glossy ice with deep color, reflections and layered parallax cracks inside it.Colored shadows: shadows turn soft blue instead of black.Soft snow lighting: translucency, rim glow and sparkles that twinkle as the camera moves.All lights: point and spot lights cast shadows on the snow. Lightmaps and reflection probes are supported.Snow on any object: the Slope Limit keeps snow only on upward-facing surfaces.Snow Coverage slider for snowfall or melting, great for weather systems.Terrain support: one-click terrain setup, plus a Terrain-to-Mesh converter for other terrain tools.Drag-and-drop prefabs: Trail System, Trail Emitter, Footprints, Particle Brush, Mouse Trail, Snow Ground and Snowy Rock.Demo scene that works in both pipelines.Perfect ForWinter, survival and exploration gamesRacing and sledding (tire and ski tracks)Character footprints in adventure and RPG gamesHoliday / Christmas scenes and cozy gamesFrozen lakes, ice caves and arctic levelsWeather systems (snowfall and melting)Technical DetailsRender pipelines: URP (Unity 6 / URP 17) and Built-in, in the same shader (Unity picks the right SubShader)Unity version: 6000.3+ Tessellation: distance-based, crack-free. A non-tessellated fallback is chosen automatically.Trails: world-space trail texture (256–4096) that follows the player and scrolls. Refill speed is adjustable.Trail sources: 64 emitters / stamps per frame, plus unlimited particles and meshes on the trail layerRendering: Forward and Forward+ (URP). Deferred cameras render the snow as forward-only.Input: works with the Input System package or the legacy Input ManagerCode: C# with assembly definitions (compiles without URP or the Input System installed), full source includedTextures: procedurally generated, tileable snow / ice / crack maps (512²). Regenerate them from the Tools menu.This package was created with the help of an AI coding assistant (Anthropic's Claude).Code: The shaders (URP HLSL and Built-in surface shader), the runtime C# scripts (trail system, emitters, footprints) and the editor tools (inspector, Splat Painter, terrain tools, demo builder) were written with AI assistance. I reviewed the code, tested it in Unity 6 in both URP and the Built-in pipeline, and fixed the issues found during testing.Textures: The default snow, ice and crack textures are generated procedurally by an editor script included in the package (noise and Voronoi math). They are not made with an AI image generator, and no third-party images were used.Demo scene, screenshots and video: These are real in-engine renders of the included demo scene. The text overlays were added with scripts.Documentation and store description: These were drafted with AI assistance and then edited by me.All content is original to this package. No copyrighted or third-party assets
