--- a/Framework/Radiography/RadiographyLayer.h	Wed Jul 03 10:12:09 2019 +0200
+++ b/Framework/Radiography/RadiographyLayer.h	Wed Jul 03 10:15:29 2019 +0200
@@ -355,5 +355,10 @@
                           float& maxValue) const = 0;
 
     friend class RadiographyMaskLayer; // because it needs to GetTransform on the dicomLayer it relates to
+
+    virtual size_t GetApproximateMemoryUsage() const // this is used to limit the number of scenes loaded in RAM when resources are limited (we actually only count the size used by the images, not the C structs)
+    {
+      return 0;
+    }
   };
 }