Procedural pattern computed with Vertex Shader

VertexShaderImage.cs

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+using UnityEngine;
+public class VertexShaderImage : MonoBehaviour
+{
+    public Shader shader;
+    protected Material material;
+    void Awake()
+    {
+        material = new Material(shader);
+    }
+    void OnRenderObject()
+    {
+        material.SetPass(0);
+        Graphics.DrawProcedural(MeshTopology.Triangles, 6 * 1024 * 1024, 1);
+    }
+}

VertexShaderImage.shader

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+Shader "Vertex Shader Image"
+{
+	Subshader
+	{
+		Pass
+		{
+			Cull Off
+			CGPROGRAM
+			#pragma vertex VSMain
+			#pragma fragment PSMain
+			#pragma target 5.0
+
+			float2 PolarToCartesian (float2 p)
+			{	
+				return p.x * float2(cos(p.y),sin(p.y));
+			}
+
+			float2 CartesianToPolar (float2 p)
+			{
+				return float2(length(p), atan2(p.y, p.x));
+			}
+
+			float3 Pattern (float2 uv)
+			{
+				uv = CartesianToPolar (abs(uv));
+				uv = (12.0*uv);   
+				uv = PolarToCartesian(uv); 
+				return float3(4.0/abs(uv),uv.x/uv.y);
+			}
+
+			float4 VSMain (uint id:SV_VertexID, out float3 color:TEXCOORD0) : SV_POSITION
+			{
+				float q = floor(float(id) / 6.0);
+				float px = fmod(float(id), 2.0);
+				float py = (float(id)-6.0 * floor(float(id)/6.0)) + 6.0;
+				py = sign(126.0-py*floor(126.0/py));
+				float3 center = float3(fmod(q,1024.0), 0.0, floor(q/1024.0));
+				float error = 0.0000001;
+				float2 uv = float2(center.x / 1024.0, center.z / 1024.0) + error;
+				uv = float2(2.0*uv-1.0);
+				color = Pattern(uv);
+				float scale = 0.1;
+				return UnityObjectToClipPos(float4(float3(sign(px)-0.5, 0.0, sign(py)-0.5) * scale + center * scale, 1.0));
+			}
+
+			float4 PSMain (float4 vertex:SV_POSITION, float3 color:TEXCOORD0) : SV_Target
+			{
+				return float4(color, 1.0);
+			}
+
+			ENDCG
+		}
+	}
+}