Adding Distance node in shgraph

hrt/shgraph/nodes/Distance.hx

@@ -0,0 +1,20 @@
+package hrt.shgraph.nodes;
+
+using hxsl.Ast;
+
+@name("Distance")
+@description("")
+@width(80)
+@group("Math")
+class Distance extends ShaderNodeHxsl {
+
+	static var SRC = {
+		@sginput(0.0) var a : Dynamic;
+		@sginput(0.0) var b : Dynamic;
+		@sgoutput var output : Float;
+		function fragment() {
+			output = distance(a,b);
+		}
+	};
+
+}