Customizing Nuke with Gizmos - Nuke 101: Professional Compositing and Visual Effects - page 510

On-screenthetextsays:frame1.1istheframenumberyoushouldbeon.[frame]
is a script indicating to look at the current frame, hence it'sreturning a value of1.
Anything you put in square brackets is interpreted as a TCL script. You can use
TCL scripts to call up the value of a property. Simply open square brackets and
type.
11. Replace the current Message property with [value NoOp1.actionSafe].
Here you are asking for the value of the ActionSafe property in the node called
NoOp1.
If you followed everything correctly, the text “frame 1” was replaced with a 5.
This is great! Your ActionSafe value should indeed be 5 and this is reflecting it.
But it might be prettier if this was a little more verbose.
12. Change the Message property to: Action Safe [value NoOp1.actionSafe]% .
Look at the Viewer and you should see FIGURE 12.26 .
Figure 12.26. The text in the Viewer is more easily understandable.
Now, to do the same for the Title Safe area:
13. Click Text1 in the DAG, copy it, and then paste it.
Text2 should now be inserted after Text1. You only have to change a few simple
things.
14. Double click Text2 to load its Properties panel.
15. Change your TCL expression to replace all occurrences of the word action with
the word title . Note that scripts are case sensitive, so keep uppercase and lower-
case consistent. It should read: Title Safe [value NoOp1.titleSafe]% .
YouhavenowchangedthewrittentexttoTitleSafeandchangedtheTCLexpres-
sion to read the value from the TitleSafe Knob.