Procedural skybox minimal example

Author: przemyslawzaworski

ProceduralSkybox.shader

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+Shader "Procedural Skybox"
+{
+	Subshader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex SetVertexShader
+			#pragma fragment SetPixelShader
+			
+			void SetVertexShader (inout float4 Vertex:POSITION, out float3 Point:TEXCOORD0)
+			{
+				Point = mul(unity_ObjectToWorld, Vertex);   // World Space coordinate
+				Vertex = UnityObjectToClipPos (Vertex);   // Screen Space coordinate
+			}
+
+			void SetPixelShader (float4 Vertex:POSITION, float3 Point:TEXCOORD0, out float4 Color:SV_TARGET)
+			{
+				float3 Direction = normalize(Point - _WorldSpaceCameraPos);   //Direction vector
+				Color = (Direction.y>0.0) ? Direction.yyyy : 0;   //Pixel color
+			}
+
+			ENDCG
+		}
+	}
+}