fixed logic issue with color gradient

www/WebDevPlayground/three.js/examples/ARforCIFT.js

@@ -76,10 +76,11 @@
 		var b = 0;
 
 		var fullrange = (arrowMaxLength - arrowMinLength);
+		var vectorRangeonScale = (vectorLength - arrowMinLength);
 
 		if(fullrange==0){ percentile = 100}
 		else{
-			var percentile = (vectorLength/fullrange)*100;
+			var percentile = (vectorLength/arrowMaxLength)*100;
 		}
 		if(percentile < 50){
 			r = 255;