Unity 雪地shader 制作

最近因为一个laya 3d小游戏而需要开发一个雪地的效果，所以先做了Unity 的雪地Shader效果!

SnowTracks.shader这个要加在将作为雪地的物体上，其次雪地的贴图自己在网上找一个就行：

Shader "test/SnowTracks" {
	Properties{
		_Tess("Tessellation", Range(1,32)) = 4
		_SnowColor("Snow Color", color) = (1,1,1,0)
		_SnowTex("Snow (RGB)", 2D) = "white" {}
		_GroundColor("Ground Color", color) = (1,1,1,0)
		_GroundTex("Ground (RGB)", 2D) = "white" {}
		_Splat("SplatMap", 2D) = "black" {}
		_Displacement("Displacement", Range(0, 1.0)) = 0.3
		_Glossiness("Smoothness", Range(0, 1.0)) = 0.5
		_Metallic("Metallic", Range(0, 1.0)) = 0
		/*_NormalMap("Normalmap", 2D) = "bump" {}
		_SpecColor("Spec color", color) = (0.5,0.5,0.5,0.5)*/
	}
		SubShader{
		Tags{ "RenderType" = "Opaque" }
		LOD 300

		CGPROGRAM
		#pragma  surface surf Standard fu