Merge pull request #342 from Unity-Technologies/fix-vector1-node

Fixed an issue where vector 1 node was not evaluating properly.

com.unity.shadergraph/Editor/Data/Nodes/Input/Basic/Vector1Node.cs

 
         public void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
         {
-            if (generationMode.IsPreview())
-                return;
-
-            visitor.AddShaderChunk(precision + " " + GetVariableNameForNode() + " = " + inputValue + ";", false);
-        }
-
-        public override string GetVariableNameForSlot(int slotId)
-        {
-            return GetVariableNameForNode();
+            visitor.AddShaderChunk(precision + " " + GetVariableNameForSlot(OutputSlotId) + " = " + inputValue + ";", false);
         }
 
         public IShaderProperty AsShaderProperty()