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| 1 | Shader "Toon/Lit Snow Buildup" {
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| 2 | Properties{
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| 3 | _Color("Main Color", Color) = (0.5,0.5,0.5,1)
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| 4 | _MainTex("Base (RGB)", 2D) = "white" {}
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| 5 | _Ramp("Toon Ramp (RGB)", 2D) = "gray" {}
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| 6 | _SnowRamp("Snow Toon Ramp (RGB)", 2D) = "gray" {}
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| 7 | _SnowAngle("Angle of snow buildup", Vector) = (0,1,0)
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| 8 | _SnowColor("Snow Base Color", Color) = (0.5,0.5,0.5,1)
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| 9 | _TColor("Snow Top Color", Color) = (0.5,0.5,0.5,1)
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| 10 | _RimColor("Snow Rim Color", Color) = (0.5,0.5,0.5,1)
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| 11 | _RimPower("Snow Rim Power", Range(0,4)) = 3
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| 12 | _SnowSize("Snow Amount", Range(-2,2)) = 1
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| 13 | _Height("Snow Height", Range(0,0.2)) = 0.1
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| 14 | ||
| 15 | ||
| 16 | ||
| 17 | } | |
| 18 | ||
| 19 | SubShader{
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| 20 | Tags{ "RenderType" = "Opaque" }
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| 21 | LOD 200 | |
| 22 | Cull Off | |
| 23 | CGPROGRAM | |
| 24 | ||
| 25 | #pragma surface surf ToonRamp vertex:disp addshadow | |
| 26 | sampler2D _Ramp; | |
| 27 | ||
| 28 | // custom lighting function that uses a texture ramp based | |
| 29 | // on angle between light direction and normal | |
| 30 | #pragma lighting ToonRamp exclude_path:prepass | |
| 31 | inline half4 LightingToonRamp(SurfaceOutput s, half3 lightDir, half atten) | |
| 32 | {
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| 33 | #ifndef USING_DIRECTIONAL_LIGHT | |
| 34 | lightDir = normalize(lightDir); | |
| 35 | #endif | |
| 36 | ||
| 37 | half d = dot(s.Normal, lightDir)*0.5 + 0.5; | |
| 38 | half3 ramp = tex2D(_Ramp, float2(d,d)).rgb; | |
| 39 | ||
| 40 | half4 c; | |
| 41 | c.rgb = s.Albedo * _LightColor0.rgb * ramp * (atten * 2); | |
| 42 | c.a = 0; | |
| 43 | return c; | |
| 44 | } | |
| 45 | ||
| 46 | ||
| 47 | sampler2D _MainTex; | |
| 48 | sampler2D _SnowRamp; | |
| 49 | ||
| 50 | float4 _Color; | |
| 51 | float4 _SnowColor; | |
| 52 | float4 _TColor; | |
| 53 | float4 _SnowAngle; | |
| 54 | float4 _RimColor; | |
| 55 | ||
| 56 | float _SnowSize; | |
| 57 | float _Height; | |
| 58 | float _RimPower; | |
| 59 | ||
| 60 | struct Input {
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| 61 | float2 uv_MainTex : TEXCOORD0; | |
| 62 | float3 worldPos; | |
| 63 | float3 viewDir; | |
| 64 | float3 lightDir; | |
| 65 | ||
| 66 | }; | |
| 67 | ||
| 68 | struct appdata {
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| 69 | float4 vertex : POSITION; | |
| 70 | float3 normal : NORMAL; | |
| 71 | }; | |
| 72 | ||
| 73 | void disp(inout appdata_full v, out Input o) | |
| 74 | {
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| 75 | UNITY_INITIALIZE_OUTPUT(Input, o); | |
| 76 | o.lightDir = WorldSpaceLightDir(v.vertex); // light direction for snow ramp | |
| 77 | float4 snowC = mul(_SnowAngle , unity_ObjectToWorld); // snow direction convertion to worldspace | |
| 78 | if (dot(v.normal, snowC.xyz) >= _SnowSize ) {
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| 79 | v.vertex.xyz += v.normal * _Height;// scale vertices along normal | |
| 80 | } | |
| 81 | ||
| 82 | } | |
| 83 | ||
| 84 | void surf(Input IN, inout SurfaceOutput o) {
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| 85 | ||
| 86 | float3 localPos = (IN.worldPos - mul(unity_ObjectToWorld, float4(0, 0, 0, 1)).xyz); // local position for snow color blend | |
| 87 | half d = dot(o.Normal, IN.lightDir)*0.5 + 0.5; // light value for snow toon ramp | |
| 88 | half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color; // main texture | |
| 89 | half3 rampS = tex2D(_SnowRamp, float2(d, d)).rgb; // snow toon ramp | |
| 90 | o.Albedo = c.rgb * _Color;// base color | |
| 91 | half rim = 1.0 - saturate(dot(normalize(IN.viewDir), o.Normal)); // rimlight | |
| 92 | if (dot( o.Normal, _SnowAngle.xyz) >= _SnowSize -0.4) { // if dot product result is higher than snow amount, we turn it into snow
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| 93 | o.Albedo = (lerp(_SnowColor * rampS, _TColor * rampS, saturate(localPos.y))); // blend base snow with top snow based on position | |
| 94 | o.Emission = _RimColor.rgb *pow(rim, _RimPower);// add glow rimlight to snow | |
| 95 | } | |
| 96 | o.Alpha = c.a; | |
| 97 | } | |
| 98 | ENDCG | |
| 99 | ||
| 100 | } | |
| 101 | ||
| 102 | Fallback "Diffuse" | |
| 103 | } |
