Added cam direction node

Added cam position node(should be implemented better but no time)

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Input/SceneData/CameraDirNode.cs

+using UnityEngine.Graphing;
+
+namespace UnityEngine.MaterialGraph
+{
+    [Title("Input/Scene Data/Camera Direction")]
+    public class CamDirNode : AbstractMaterialNode
+    {
+        public CamDirNode()
+        {
+            name = "CameraDirection";
+            UpdateNodeAfterDeserialization();
+        }
+
+        private const int kOutputSlotId = 0;
+        private const string kOutputSlotName = "Output";
+
+        public override bool hasPreview { get { return true; } }
+        public override PreviewMode previewMode
+        {
+            get { return PreviewMode.Preview2D; }
+        }
+
+
+        public sealed override void UpdateNodeAfterDeserialization()
+        {
+            AddSlot(new MaterialSlot(kOutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output, SlotValueType.Vector4, Vector4.zero));
+			RemoveSlotsNameNotMatching(new[] { kOutputSlotId });
+        }
+
+        public override string GetVariableNameForSlot(int slotId)
+        {
+			return "UNITY_MATRIX_IT_MV [2].xyz";
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Input/SceneData/CameraDirNode.cs.meta

+fileFormatVersion: 2
+guid: dd27728b9ce314209beef46e595204c5
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Input/SceneData/CameraPosNode.cs

+using UnityEngine.Graphing;
+
+namespace UnityEngine.MaterialGraph
+{
+    [Title("Input/Scene Data/Camera Position")]
+    public class CamPosNode : AbstractMaterialNode
+    {
+		//TODO - should be a global and immpiment a Imayrequire
+        public CamPosNode()
+        {
+            name = "CameraPosition";
+            UpdateNodeAfterDeserialization();
+        }
+
+        private const int kOutputSlotId = 0;
+        private const string kOutputSlotName = "Output";
+
+        public override bool hasPreview { get { return true; } }
+        public override PreviewMode previewMode
+        {
+            get { return PreviewMode.Preview2D; }
+        }
+
+
+        public sealed override void UpdateNodeAfterDeserialization()
+        {
+            AddSlot(new MaterialSlot(kOutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output, SlotValueType.Vector4, Vector4.zero));
+			RemoveSlotsNameNotMatching(new[] { kOutputSlotId });
+        }
+
+        public override string GetVariableNameForSlot(int slotId)
+        {
+			return "_WorldSpaceCameraPos";
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Nodes/Input/SceneData/CameraPosNode.cs.meta

+fileFormatVersion: 2
+guid: 27a1751acacc54e278090fb991699a90
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: