Revert "Revert "added sphere mask node""

fixing a mistake i only just now noticed shhh

com.unity.shadergraph/.data/sphereMask.PNG

+version https://git-lfs.github.com/spec/v1
+oid sha256:8df3a610b0b2a3f8d3b6a2b9ddb563c3a74e682055b53bc728ac7f795870d9ad
+size 91474

com.unity.shadergraph/Editor/Data/Nodes/Math/Vector/SphereMaskNode.cs

+using System.Reflection;
+using UnityEngine;
+
+namespace UnityEditor.ShaderGraph
+{
+    [Title("Math", "Vector", "Sphere Mask")]
+    public class SphereMaskNode : CodeFunctionNode
+    {
+        public SphereMaskNode()
+        {
+            name = "Sphere Mask";
+        }
+
+        public override string documentationURL
+        {
+            get { return "https://github.com/Unity-Technologies/ShaderGraph/wiki/Sphere-Mask-Node"; }
+        }
+
+        protected override MethodInfo GetFunctionToConvert()
+        {
+            return GetType().GetMethod("SphereMask", BindingFlags.Static | BindingFlags.NonPublic);
+        }
+
+        static string SphereMask(
+            [Slot(0, Binding.None)] DynamicDimensionVector Coords,
+            [Slot(1, Binding.None, 0.5f, 0.5f, 0.5f, 0.5f)] DynamicDimensionVector Center,
+			[Slot(2, Binding.None, 0.1f, 0.1f, 0.1f, 0.1f)] Vector1 Radius,
+			[Slot(3, Binding.None, 0.8f, 0.8f, 0.8f, 0.8f)] Vector1 Hardness,
+            [Slot(4, Binding.None)] out DynamicDimensionVector Out)
+        {
+            return
+                @"
+{
+	Out = 1 - saturate((distance(Coords, Center) - Radius) / (1 - Hardness));
+}
+";
+        }
+    }
+}

com.unity.shadergraph/Editor/Data/Nodes/Math/Vector/SphereMaskNode.cs.meta

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