TriPlanar now has blend and tile properties

MaterialGraphProject/Assets/Vlad/UVTriPlanar.cs

 namespace UnityEngine.MaterialGraph
 {
     [Title("UV/Tri-Planar Mapping")]
-    public class UVTriPlanar : Function2Input, IGeneratesFunction, IMayRequireNormal, IMayRequireWorldPosition
+    public class UVTriPlanar : Function3Input, IGeneratesFunction, IMayRequireNormal, IMayRequireWorldPosition
+        private const string kTileSlotName = "Tile";
         private const string kBlendSlotName = "Blend";
 
         protected override string GetFunctionName()
 
         protected override MaterialSlot GetInputSlot2()
         {
-            return new MaterialSlot(InputSlot2Id, kBlendSlotName, kBlendSlotName, SlotType.Input, SlotValueType.Vector1, Vector4.one);
+            return new MaterialSlot(InputSlot2Id, kTileSlotName, kTileSlotName, SlotType.Input, SlotValueType.Vector1, Vector4.one);
+        }
+
+        protected override MaterialSlot GetInputSlot3()
+        {
+            return new MaterialSlot(InputSlot3Id, kBlendSlotName, kBlendSlotName, SlotType.Input, SlotValueType.Vector1, Vector4.one);
         }
 
         protected override MaterialSlot GetOutputSlot()
 			}
 		}
 
-		protected override string GetFunctionPrototype(string arg1Name, string arg2Name)
+		protected override string GetFunctionPrototype(string arg1Name, string arg2Name, string arg3Name)
-                   + "sampler2D " + arg1Name + ", " + precision + " " + arg2Name + ", float3 normal, float3 pos)";
+                   + "sampler2D " + arg1Name + ", " 
+                   + precision + " " + arg2Name + ", " 
+                   + precision + " " + arg3Name + 
+                   ", float3 normal, float3 pos)";
-        protected override string GetFunctionCallBody(string input1Value, string input2Value)
+        protected override string GetFunctionCallBody(string input1Value, string input2Value, string input3Value)
-            return GetFunctionName() + " (" + input1Value + ", " + input2Value + ", IN.worldNormal, IN.worldPos)";
+            return GetFunctionName() + " (" + input1Value + ", " + input2Value + ", " + input3Value + ", IN.worldNormal, IN.worldPos)";
         }
 
         public override void GeneratePropertyUsages(ShaderGenerator visitor, GenerationMode generationMode)
             }
               
 
-            outputString.AddShaderChunk(GetFunctionPrototype("arg1", "arg2"), false);
+            outputString.AddShaderChunk(GetFunctionPrototype("arg1", "arg2", "arg3"), false);
+            // create UVs from position
+            outputString.AddShaderChunk("fixed3 uvs = pos * arg2;", false);
-            outputString.AddShaderChunk("half3 blend = abs(normal);", false);
-
-            //control the influence of the blend
-            outputString.AddShaderChunk("blend = lerp(0, 1, arg2);", false);
+            outputString.AddShaderChunk("half3 blend = pow(abs(normal), arg3);", false);
-            outputString.AddShaderChunk("fixed4 cx = tex2D(arg1, pos.yz);", false);
-            outputString.AddShaderChunk("fixed4 cy = tex2D(arg1, pos.xz);", false);
-            outputString.AddShaderChunk("fixed4 cz = tex2D(arg1, pos.xy);", false);
+            outputString.AddShaderChunk("fixed4 cx = tex2D(arg1, uvs.yz);", false);
+            outputString.AddShaderChunk("fixed4 cy = tex2D(arg1, uvs.xz);", false);
+            outputString.AddShaderChunk("fixed4 cz = tex2D(arg1, uvs.xy);", false);
 
 
             // blend the textures based on weights