Added a procedural box node and made a few changes to the inputs of the pulse node.

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Procedural/PulseNode.cs

 namespace UnityEngine.MaterialGraph
 {
     [Title("Procedural/Pulse")]
-    public class PulseNode : Function3Input, IGeneratesFunction
+    public class PulseNode : Function2Input, IGeneratesFunction
     {
         public PulseNode()
         {
 
         protected override string GetInputSlot1Name()
         {
-            return "Value";
+            return "X Value";
-            return "MinValue";
-        }
-
-        protected override string GetInputSlot3Name()
-        {
-            return "MaxValue";
+            return "X Min and Max";
         }
 
         protected override MaterialSlot GetInputSlot1()
 
         protected override MaterialSlot GetInputSlot2()
         {
-            return new MaterialSlot(InputSlot2Id, GetInputSlot2Name(), kInputSlot2ShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector1, Vector2.zero);
-        }
-
-        protected override MaterialSlot GetInputSlot3()
-        {
-            return new MaterialSlot(InputSlot3Id, GetInputSlot3Name(), kInputSlot3ShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector1, Vector2.zero);
+            return new MaterialSlot(InputSlot2Id, GetInputSlot2Name(), kInputSlot2ShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector2, Vector2.zero);
         }
 
         protected override MaterialSlot GetOutputSlot()
         public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
         {
             var outputString = new ShaderGenerator();
-            outputString.AddShaderChunk(GetFunctionPrototype("value", "minValue", "maxValue"), false);
+            outputString.AddShaderChunk(GetFunctionPrototype("xValue", "xMinAndMax"), false);
-            outputString.AddShaderChunk("return step( minValue, value ) - step( maxValue, value );", false);
+            outputString.AddShaderChunk("return step( xMinAndMax.x, xValue ) - step( xMinAndMax.y, xValue );", false);
 
             outputString.Deindent();
             outputString.AddShaderChunk("}", false);

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Procedural/BoxNode.cs

+namespace UnityEngine.MaterialGraph
+{
+    [Title("Procedural/Box")]
+    public class BoxNode : Function3Input, IGeneratesFunction
+    {
+        public BoxNode()
+        {
+            name = "Box";
+        }
+
+        protected override string GetFunctionName()
+        {
+            return "unity_boxnode_" + precision;
+        }
+
+        protected override string GetInputSlot1Name()
+        {
+            return "X and Y";
+        }
+
+        protected override string GetInputSlot2Name()
+        {
+            return "X Min and Max";
+        }
+
+        protected override string GetInputSlot3Name()
+        {
+            return "Y Min and Max";
+        }
+
+        protected override MaterialSlot GetInputSlot1()
+        {
+            return new MaterialSlot(InputSlot1Id, GetInputSlot1Name(), kInputSlot1ShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector2, Vector3.zero);
+        }
+
+        protected override MaterialSlot GetInputSlot2()
+        {
+            return new MaterialSlot(InputSlot2Id, GetInputSlot2Name(), kInputSlot2ShaderName, UnityEngine.Graphing.SlotType.Input, SlotValueType.Vector2, Vector3.zero);
+        }
+
+        protected override MaterialSlot GetInputSlot3()
+        {
+            return new MaterialSlot(InputSlot3Id, GetInputSlot3Name(), kInputSlot3ShaderName, 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(GetFunctionPrototype("xy", "xMinAndMax", "yMinAndMax"), false);
+            outputString.AddShaderChunk("{", false);
+            outputString.Indent();
+
+            outputString.AddShaderChunk("float x = step( xMinAndMax.x, xy.x ) - step( xMinAndMax.y, xy.x );", false);
+            outputString.AddShaderChunk("float y = step( yMinAndMax.x, xy.y ) - step( yMinAndMax.y, xy.y );", false);
+            outputString.AddShaderChunk("return x * y;", false);
+
+            outputString.Deindent();
+            outputString.AddShaderChunk("}", false);
+
+            visitor.AddShaderChunk(outputString.GetShaderString(0), true);
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Procedural/BoxNode.cs.meta

+fileFormatVersion: 2
+guid: 0f23589566e318c408af431d95bb492c
+timeCreated: 1495565599
+licenseType: Pro
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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