Added a procedural noise function.

MaterialGraphProject/Assets/Brandon/NoiseNode.cs

+namespace UnityEngine.MaterialGraph
+{
+    [Title("Input/Procedural/Noise Node")]
+    public class NoiseNode : Function1Input, IGeneratesFunction
+    {
+        public NoiseNode()
+        {
+            name = "NoiseNode";
+        }
+
+        protected override string GetFunctionName()
+        {
+            return "unity_noise_" + precision;
+        }
+
+        protected override string GetInputSlotName()
+        {
+            return "UV";
+        }
+
+        protected override MaterialSlot GetInputSlot()
+        {
+            return new MaterialSlot(InputSlotId, GetInputSlotName(), kInputSlotShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector2, Vector2.zero);
+        }
+
+        protected override MaterialSlot GetOutputSlot()
+        {
+            return new MaterialSlot(OutputSlotId, GetOutputSlotName(), kOutputSlotShaderName, UnityEngine.Graphing.SlotType.Output, SlotValueType.Vector1, Vector2.zero);
+        }
+
+        public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
+        {
+            var outputString = new ShaderGenerator();
+
+            outputString.AddShaderChunk("inline float unity_randomValue (float2 uv)", false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("return frac(sin(dot(uv, float2(12.9898, 78.233)))*43758.5453);", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+
+
+            outputString.AddShaderChunk("inline float unity_interpolate (float a, float b, float t)", false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("return (1.0-t)*a + (t*b);", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+
+            outputString.AddShaderChunk("inline float unity_valueNoise (float2 uv)", false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("float2 i = floor(uv);", false);
+            outputString.AddShaderChunk("float2 f = frac(uv);", false);
+            outputString.AddShaderChunk("f = f * f * (3.0 - 2.0 * f);", false);
+
+            outputString.AddShaderChunk("uv = abs(frac(uv) - 0.5);", false);
+            outputString.AddShaderChunk("float2 c0 = i + float2(0.0, 0.0);", false);
+            outputString.AddShaderChunk("float2 c1 = i + float2(1.0, 0.0);", false);
+            outputString.AddShaderChunk("float2 c2 = i + float2(0.0, 1.0);", false);
+            outputString.AddShaderChunk("float2 c3 = i + float2(1.0, 1.0);", false);
+            outputString.AddShaderChunk("float r0 = unity_randomValue(c0);", false);
+            outputString.AddShaderChunk("float r1 = unity_randomValue(c1);", false);
+            outputString.AddShaderChunk("float r2 = unity_randomValue(c2);", false);
+            outputString.AddShaderChunk("float r3 = unity_randomValue(c3);", false);
+
+            outputString.AddShaderChunk("float bottomOfGrid = unity_interpolate(r0, r1, f.x);", false);
+            outputString.AddShaderChunk("float topOfGrid = unity_interpolate(r2, r3, f.x);", false);
+            outputString.AddShaderChunk("float t = unity_interpolate(bottomOfGrid, topOfGrid, f.y);", false);
+            outputString.AddShaderChunk("return t;", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+
+
+            outputString.AddShaderChunk(GetFunctionPrototype("uv"), false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("float t = 0.0;", false);
+            outputString.AddShaderChunk("for(int i = 0; i < 3; i++)", false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("float freq = pow(2.0, float(i));", false);
+            outputString.AddShaderChunk("float amp = pow(0.5, float(3-i));", false);
+            outputString.AddShaderChunk("t += unity_valueNoise(float2(uv.x/freq, uv.y/freq))*amp;", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+            outputString.AddShaderChunk("return t;", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+
+            visitor.AddShaderChunk(outputString.GetShaderString(0), true);
+        }
+    }
+}

MaterialGraphProject/Assets/Brandon/NoiseNode.cs.meta

+fileFormatVersion: 2
+guid: 6e05bd4324babff4498e856ab63b993c
+timeCreated: 1495526233
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: