Update RTX class/SegmentedAperture.m

RTX class/SegmentedAperture.m

@@ -3,6 +3,7 @@ classdef SegmentedAperture < Aperture
         segments SegmentArray;
         prevTrace = Trace(Inf, Ray([0 0],[0 0], 0), 0, [], 0); 
         prevCol;
+        isSegmented = false;
     end
     methods
         function obj = SegmentedAperture(center, size)
@@ -26,7 +27,10 @@ classdef SegmentedAperture < Aperture
         end
         
         function [histogram, xStart, xStop] = getCollisionHistogram(obj)
+            if ~obj.isSegmented
                 obj.segments = obj.segments.doTheThing2();
+                obj.isSegmented = true;
+            end
             histogram = [obj.segments.segs.powDens];
             xStart = [obj.segments.segs.posStart];
             xStop = [obj.segments.segs.posEnd];