Adding Mandelbrot fractal node. Not perfect, but it's there

MaterialGraphProject/Assets/Eduardo/FunctionNAddNode.cs

 
         public void AddInputSlot()
         {
-            string inputName = "Input" + GetInputSlots<ISlot>().Count().ToString();
+            string inputName = "Input" + GetInputSlots<MaterialSlot>().Count().ToString();
             AddSlot(inputName, inputName, Graphing.SlotType.Input, SlotValueType.Dynamic);
         }
 

MaterialGraphProject/Assets/Eduardo/FunctionNInNOut.cs

         public FunctionNInNOut()
         {
             name = "FunctionNInNOut";
+            UpdateNodeAfterDeserialization();
         }
 
         public override void UpdateNodeAfterDeserialization()

MaterialGraphProject/Assets/Eduardo/EduardoTestGraph.ShaderGraph.meta

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MaterialGraphProject/Assets/Rinaldo/FractalNode.cs

+using UnityEngine.Graphing;
+using System.Linq;
+using System.Collections;
+
+namespace UnityEngine.MaterialGraph
+{
+    [Title("Procedural/Fractal")]
+    public class FractalNode : FunctionNInNOut, IGeneratesFunction
+    {
+
+        public FractalNode()
+        {
+            name = "Fractal";
+            AddSlot("UV", "texCoord", Graphing.SlotType.Input, SlotValueType.Vector2);
+            AddSlot("Pan", "Pan", Graphing.SlotType.Input, SlotValueType.Vector2);
+            AddSlot("Zoom", "Zoom", Graphing.SlotType.Input, SlotValueType.Vector1);
+            AddSlot("Aspect", "Aspect", Graphing.SlotType.Input, SlotValueType.Vector1);
+
+            AddSlot("FracResult", "fractalRes", Graphing.SlotType.Output, SlotValueType.Dynamic);
+
+            UpdateNodeAfterDeserialization();
+        }
+
+        protected override string GetFunctionName()
+        {
+            return "unity_Fractal";
+        }
+
+        public override bool hasPreview
+        {
+            get { return true; }
+        }
+
+        public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
+        {
+            var outputString = new ShaderGenerator();
+            outputString.AddShaderChunk(GetFunctionPrototype(), false);
+            outputString.AddShaderChunk("{", false);
+            outputString.AddShaderChunk("const int Iterations = 128;", false);
+            outputString.Indent();
+            outputString.AddShaderChunk("float2 c = (texCoord - 0.5) * Zoom * float2(1, Aspect) - Pan;", false);
+            outputString.AddShaderChunk("float2 v = 0;", false);
+            outputString.AddShaderChunk("for (int n = 0; n < Iterations && dot(v,v) < 4; n++)", false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+            outputString.AddShaderChunk("v = float2(v.x * v.x - v.y * v.y, v.x * v.y * 2) + c;", false);
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+            outputString.Deindent();
+            outputString.AddShaderChunk("fractalRes = (dot(v, v) > 4) ? (float)n / (float)Iterations : 0;", false);
+            outputString.AddShaderChunk("}", false);
+
+            visitor.AddShaderChunk(outputString.GetShaderString(0), true);
+        }
+    }
+}

MaterialGraphProject/Assets/Rinaldo/FractalNode.cs.meta

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