Volumetric light scattering demo

Author: przemyslawzaworski

volumetric_lighting.shader

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+Shader "Volumetric Lighting"
+{
+	Properties
+	{
+		pattern ("Texture", 2D) = "white" {} 
+	}
+	Subshader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vertex_shader
+			#pragma fragment pixel_shader
+			#pragma target 3.0
+
+			sampler2D pattern;
+			
+			struct structure
+			{
+				float4 vertex : SV_POSITION;
+				float2 uv : TEXCOORD0; 
+			};
+			
+			structure vertex_shader (float4 vertex:POSITION, float2 uv:TEXCOORD0)
+			{
+				structure vs;
+				vs.vertex = UnityObjectToClipPos(vertex);
+				vs.uv = uv;
+				return vs;
+			}
+
+			float4 pixel_shader (structure ps) : COLOR
+			{
+				float2 uv = float2(2.0*ps.uv.xy-1.0);
+				float color = 0.0;
+				for(int i=0;i<192;++i)
+				{
+					float2 p=(uv*asin(dot(uv,uv)*float(i)*0.01)/dot(uv,uv));
+					p.x-=_Time.g*0.5;
+					color+=tex2Dlod(pattern,float4(p*0.2,0.0,0.0)).r*0.01;
+				}
+				return float4(color,0.0,0.0,1.0);			
+			}
+			ENDCG
+		}
+	}
+}