RainShader.shader

//
// Rain Maker (c) 2015 Digital Ruby, LLC
// http://www.digitalruby.com
//

Shader "Custom/RainShader"
{
    Properties
	{
		_MainTex ("Color (RGB) Alpha (A)", 2D) = "gray" {}
		_TintColor ("Tint Color (RGB)", Color) = (1, 1, 1, 1)
		_PointSpotLightMultiplier ("Point/Spot Light Multiplier", Range (0, 10)) = 2
		_DirectionalLightMultiplier ("Directional Light Multiplier", Range (0, 10)) = 1
		_InvFade ("Soft Particles Factor", Range(0.01, 100.0)) = 1.0
		_AmbientLightMultiplier ("Ambient light multiplier", Range(0, 1)) = 0.25
    }

    SubShader
	{
        Tags { "QUEUE"="Transparent" "IGNOREPROJECTOR"="true" "RenderType"="Transparent" "LightMode"="Vertex" }
		LOD 100

        Pass
		{
			ZWrite Off
			Cull Back
            Lighting On     
			AlphaTest Greater 0.01
			ColorMask RGB
			Blend SrcAlpha OneMinusSrcAlpha

            CGPROGRAM

            #pragma multi_compile_particles
            #pragma vertex vert
            #pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest

            #include "UnityCG.cginc"
			#include "Lighting.cginc"

			fixed4 _TintColor;
			float _DirectionalLightMultiplier;
			float _PointSpotLightMultiplier;
			float _AmbientLightMultiplier;

			#if defined(SOFTPARTICLES_ON)
			float _InvFade;
			#endif

			struct appdata_t
			{
				float4 vertex : POSITION;
				fixed4 color : COLOR;
				float2 texcoord : TEXCOORD0;
			};

		    struct v2f
            {
                half2 uv_MainTex : TEXCOORD0;
                fixed4 color : COLOR0;
                float4 pos : SV_POSITION;
				#if defined(SOFTPARTICLES_ON)
                float4 projPos : TEXCOORD1;
                #endif
            };

			float3 ApplyLight(int index, float3 lightColor, float3 viewPos)
			{
				fixed3 currentLightColor = unity_LightColor[index].rgb;