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Assets/VRTemplateAssets/Materials/Skybox/Horizontal Skybox.shader

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+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+
+Shader "Skybox/Horizontal Skybox"
+{
+    Properties
+    {
+        _Color1 ("Top Color", Color) = (1, 1, 1, 0)
+        _Color2 ("Horizon Color", Color) = (1, 1, 1, 0)
+        _Color3 ("Bottom Color", Color) = (1, 1, 1, 0)
+        _Exponent1 ("Exponent Factor for Top Half", Float) = 1.0
+        _Exponent2 ("Exponent Factor for Bottom Half", Float) = 1.0
+        _Intensity ("Intensity Amplifier", Float) = 1.0
+    }
+
+    CGINCLUDE
+
+    #include "UnityCG.cginc"
+
+    struct appdata
+    {
+        float4 position : POSITION;
+        float3 texcoord : TEXCOORD0;
+        UNITY_VERTEX_INPUT_INSTANCE_ID
+    };
+
+    struct v2f
+    {
+        float4 position : SV_POSITION;
+        float3 texcoord : TEXCOORD0;
+        UNITY_VERTEX_OUTPUT_STEREO
+    };
+
+    half4 _Color1;
+    half4 _Color2;
+    half4 _Color3;
+    half _Intensity;
+    half _Exponent1;
+    half _Exponent2;
+    half4 _MainTex_ST;
+
+    v2f vert (appdata v)
+    {
+        v2f o;
+        UNITY_SETUP_INSTANCE_ID(v);
+        UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+        o.position = UnityObjectToClipPos (v.position);
+        o.texcoord = v.texcoord;
+        return o;
+    }
+
+    half4 frag (v2f i) : COLOR
+    {
+        float p = normalize (i.texcoord).y;
+        float p1 = 1.0f - pow (min (1.0f, 1.0f - p), _Exponent1);
+        float p3 = 1.0f - pow (min (1.0f, 1.0f + p), _Exponent2);
+        float p2 = 1.0f - p1 - p3;
+        return (_Color1 * p1 + _Color2 * p2 + _Color3 * p3) * _Intensity;
+    }
+
+    ENDCG
+
+    SubShader
+    {
+        Tags { "RenderType"="Background" "Queue"="Background" }
+        Pass
+        {
+            ZWrite Off
+            Cull Off
+            Fog { Mode Off }
+            CGPROGRAM
+            #pragma fragmentoption ARB_precision_hint_fastest
+            #pragma vertex vert
+            #pragma fragment frag
+            ENDCG
+        }
+    }
+}