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@@ -43,10 +43,17 @@ components = [
 
 tiltx_s2 = s.elements["stdelem"].surfaces["s2"].rootcoordinatesystem.tiltx
 tiltx_s3 = s.elements["stdelem"].surfaces["s3"].rootcoordinatesystem.tiltx
-tiltx_s3.changetype("pickup", function=(lambda x: -x), args=(tiltx_s2,))
+tiltx_s3.changetype("pickup",
+                    functionobject=(
+                            FunctionObject("f = function=(lambda x: -x)", ["f"]),
+                            "f"),
+                    args=(tiltx_s2,))
 s.rootcoordinatesystem.update()
 # Setting tiltx of s3 as -tiltx of s2 via pickup and update coordinate systems afterwards.
-
+# Notice that the FunctionObject needs two arguments: the source code and the list of functions
+# to be read from dict, while functionobject keyword needs a tuple where the FunctionObject is
+# refered together with the function used for the pickup. There you have the opportunity to define
+# one FunctionObject for several pickups or other things were functions are needed (i.e. GRIN media).
 
 pyrateoptics.listOptimizableVariables(s, maxcol=30)
 # Lists optimizable variables (the identifiers are keys to a dict which collects them all).