Example changes.

Example/ExampleNodeGraph.asset

@@ -12,11 +12,10 @@ MonoBehaviour:
   m_Name: ExampleNodeGraph
   m_EditorClassIdentifier: 
   nodes:
-  - {fileID: 114386305456729202}
+  - {fileID: 114729867621534192}
-  - {fileID: 114862693020615806}
+  - {fileID: 114708853913061688}
-  - {fileID: 114245132648392102}
+  - {fileID: 114511978881715272}
-  - {fileID: 114602227203521556}
+--- !u!114 &114511978881715272
---- !u!114 &114245132648392102
 MonoBehaviour:
   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
@@ -24,34 +23,32 @@ MonoBehaviour:
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   m_Enabled: 1
   m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 22e05e2a1f5ad7645850d52212143629, type: 3}
+  m_Script: {fileID: 11500000, guid: 19e541bba2a188f4a84c6f3718ee6d55, type: 3}
   m_Name: MathNode
   m_EditorClassIdentifier: 
   graph: {fileID: 11400000}
-  position: {x: -429.5, y: -110.5}
+  position: {x: -539.5, y: -205}
   inputs:
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+  - node: {fileID: 114511978881715272}
     _fieldName: a
     connections: []
     _direction: 0
-  - node: {fileID: 114245132648392102}
+  - node: {fileID: 114511978881715272}
     _fieldName: b
     connections: []
     _direction: 0
   outputs:
-  - node: {fileID: 114245132648392102}
+  - node: {fileID: 114511978881715272}
     _fieldName: result
     connections:
-    - fieldName: a
+    - fieldName: x
-      node: {fileID: 114862693020615806}
+      node: {fileID: 114708853913061688}
-    - fieldName: value
-      node: {fileID: 114602227203521556}
     _direction: 1
-  a: 4.771955
+  a: 2.7975256
-  b: 8.313191
+  b: 6.7917466
   result: 0
   mathType: 0
---- !u!114 &114386305456729202
+--- !u!114 &114708853913061688
 MonoBehaviour:
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   m_PrefabParentObject: {fileID: 0}
@@ -59,74 +56,55 @@ MonoBehaviour:
   m_GameObject: {fileID: 0}
   m_Enabled: 1
   m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 98f6f901f0da53142b79277ea3f42518, type: 3}
+  m_Script: {fileID: 11500000, guid: 05559f4106850df4ab41776666216480, type: 3}
-  m_Name: DisplayValue
+  m_Name: Vector
   m_EditorClassIdentifier: 
   graph: {fileID: 11400000}
-  position: {x: 23.5, y: -98.5}
+  position: {x: -157.5, y: -115}
   inputs:
-  - node: {fileID: 114386305456729202}
+  - node: {fileID: 114708853913061688}
-    _fieldName: value
+    _fieldName: x
     connections:
     - fieldName: result
-      node: {fileID: 114862693020615806}
+      node: {fileID: 114511978881715272}
     _direction: 0
-  outputs: []
+  - node: {fileID: 114708853913061688}
-  value: 4.01703
+    _fieldName: y
---- !u!114 &114602227203521556
+    connections: []
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_GameObject: {fileID: 0}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 98f6f901f0da53142b79277ea3f42518, type: 3}
-  m_Name: DisplayValue
-  m_EditorClassIdentifier: 
-  graph: {fileID: 11400000}
-  position: {x: -194.5, y: -140.5}
-  inputs:
-  - node: {fileID: 114602227203521556}
-    _fieldName: value
-    connections:
-    - fieldName: result
-      node: {fileID: 114245132648392102}
     _direction: 0
-  outputs: []
+  - node: {fileID: 114708853913061688}
-  value: 0
+    _fieldName: z
---- !u!114 &114862693020615806
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_GameObject: {fileID: 0}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 22e05e2a1f5ad7645850d52212143629, type: 3}
-  m_Name: MathNode
-  m_EditorClassIdentifier: 
-  graph: {fileID: 11400000}
-  position: {x: -196.5, y: -45.5}
-  inputs:
-  - node: {fileID: 114862693020615806}
-    _fieldName: a
-    connections:
-    - fieldName: result
-      node: {fileID: 114245132648392102}
-    _direction: 0
-  - node: {fileID: 114862693020615806}
-    _fieldName: b
     connections: []
     _direction: 0
   outputs:
-  - node: {fileID: 114862693020615806}
+  - node: {fileID: 114708853913061688}
-    _fieldName: result
+    _fieldName: vector
     connections:
     - fieldName: value
-      node: {fileID: 114386305456729202}
+      node: {fileID: 114729867621534192}
     _direction: 1
-  a: 8.142139
+  x: 0
-  b: 3.53361
+  y: 2.6412349
-  result: 0
+  z: 14.33477
-  mathType: 1
+  vector: {x: 0, y: 0, z: 0}
+--- !u!114 &114729867621534192
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 98f6f901f0da53142b79277ea3f42518, type: 3}
+  m_Name: DisplayValue
+  m_EditorClassIdentifier: 
+  graph: {fileID: 11400000}
+  position: {x: 78.5, y: -64}
+  inputs:
+  - node: {fileID: 114729867621534192}
+    _fieldName: value
+    connections:
+    - fieldName: vector
+      node: {fileID: 114708853913061688}
+    _direction: 0
+  outputs: []

Example/ExampleNodeGraph.asset.meta

@@ -1,8 +1,9 @@
 fileFormatVersion: 2
-guid: 614b670274b902e44bba59ba861eb1bd
+guid: cee47fa32ae90bb4f8f0bec6f186cb3b
-timeCreated: 1507988229
+timeCreated: 1509308927
 licenseType: Free
 NativeFormatImporter:
+  externalObjects: {}
   mainObjectFileID: 11400000
   userData: 
   assetBundleName: 

Example/Nodes/DisplayValue.cs

@@ -1,9 +1,9 @@
-namespace ExampleNodes {
+namespace BasicNodes {
     public class DisplayValue : Node {
-        [Input] public float value;
+        [Input(ShowBackingValue.Never)] public object value;
 
-        public float GetValue() {
+        public override object GetValue(NodePort port) {
-            return GetInputByFieldName<float>("value", value);
+            return GetInputByFieldName<object>("value", value);
         }
     }
 }

Example/Nodes/Editor.meta

@@ -1,9 +1,10 @@
 fileFormatVersion: 2
 guid: 0d2300267781fed46a6d964565309cbf
 folderAsset: yes
-timeCreated: 1505987971
+timeCreated: 1509307735
 licenseType: Free
 DefaultImporter:
+  externalObjects: {}
   userData: 
   assetBundleName: 
   assetBundleVariant: 

Example/Nodes/Editor/DisplayValueEditor.cs

@@ -1,20 +1,16 @@
 using System.Collections;
 using System.Collections.Generic;
-using UnityEngine;
 using UnityEditor;
+using UnityEngine;
 
-namespace ExampleNodes {
+namespace BasicNodes {
-    [CustomNodeEditor(typeof(ExampleNodes.DisplayValue), "ExampleNodes/Display Value")]
+    [CustomNodeEditor(typeof(DisplayValue), "BasicNodes/DisplayValue")]
     public class DisplayValueEditor : NodeEditor {
 
         protected override void OnBodyGUI(out Dictionary<NodePort, Vector2> portPositions) {
             base.OnBodyGUI(out portPositions);
-            EditorGUILayout.LabelField(GetResult().ToString());
+            object obj = target.GetValue(null);
-        }
+            if (obj != null) EditorGUILayout.LabelField(target.GetValue(null).ToString());
-
-        public float GetResult() {
-            DisplayValue t = target as DisplayValue;
-            return t.GetValue();
         }
     }
 }

Example/Nodes/Editor/DisplayValueEditor.cs.meta

@@ -1,8 +1,9 @@
 fileFormatVersion: 2
-guid: 429e0671aa9024e449642837aeadc9c2
+guid: 7d7298690665789498dc42a285eb2c28
-timeCreated: 1507499229
+timeCreated: 1509305659
 licenseType: Free
 MonoImporter:
+  externalObjects: {}
   serializedVersion: 2
   defaultReferences: []
   executionOrder: 0

Example/Nodes/MathNode.cs

@@ -1,4 +1,4 @@
-namespace ExampleNodes {
+namespace BasicNodes {
     [System.Serializable]
     public class MathNode : Node {
         // Adding [Input] or [Output] is all you need to do to register a field as a valid port on your node 

Example/Nodes/MathNode.cs.meta

@@ -1,8 +1,9 @@
 fileFormatVersion: 2
-guid: 22e05e2a1f5ad7645850d52212143629
+guid: 19e541bba2a188f4a84c6f3718ee6d55
-timeCreated: 1505937586
+timeCreated: 1509307779
 licenseType: Free
 MonoImporter:
+  externalObjects: {}
   serializedVersion: 2
   defaultReferences: []
   executionOrder: 0

Example/Nodes/Vector.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+
+namespace BasicNodes {
+    public class Vector : Node {
+        [Input] public float x, y, z;
+        [Output] public Vector3 vector;
+
+        public override object GetValue(NodePort port) {
+            float x = GetInputByFieldName<float>("x", this.x);
+            float y = GetInputByFieldName<float>("y", this.y);
+            float z = GetInputByFieldName<float>("z", this.z);
+            return new Vector3(x, y, z);
+        }
+    }
+}

Example/Nodes/Vector.cs.meta

@@ -0,0 +1,13 @@
+fileFormatVersion: 2
+guid: 05559f4106850df4ab41776666216480
+timeCreated: 1509303406
+licenseType: Free
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: