Unity_PhotosphereShader

Shader "PhotosphereSky"
{
    Properties {
        _MainTex ("", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "Queue"="Background" "RenderType"="Background" }
        Cull Off ZWrite Off Fog { Mode Off }

        Pass {

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

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

            #define PI 3.141592653589793

            uniform sampler2D _MainTex;

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 dir : TEXCOORD1;
            };

            v2f vert(appdata_base v)
            {
                v2f OUT;

                OUT.pos = mul (UNITY_MATRIX_MVP, float4(v.vertex.xyz,1.0));
                OUT.uv =
                v.texcoord.xy;

                OUT.dir =
                v.vertex.xyz;
                //mul(_Object2World, v.vertex).xyz;
                //- _WorldSpaceCameraPos;

                return OUT;
            }

            float4 frag(v2f IN) : COLOR
            {
                float3 d = -normalize(IN.dir);

                float2 uv =
                float2(0.5+atan2(d.z,d.x)/(2*PI),0.5-asin(d.y)/PI);

                half4 col;

                //anti-seam conditions
                if ( uv.x < 0.001){
                    col = tex2D(_MainTex, float2(0.0, uv.y) );

                }
                else if ( uv.x > 0.999){
                    col = tex2D(_MainTex, float2(1.0, uv.y) );
                }
                else
                {
                    col =
                    tex2D(_MainTex, uv );
                }

                return col;
            }

            ENDCG
        }
    }
    Fallback off
}