Nuke Python Expression Switch

Nuke’s Python expression syntax can be shorter and more readable than tcl.

Imagine, you want to use a switch to toggle part of your comp on or off on certain frames – maybe to fix artifacts in a 3D pass. Instead of animating a switch’s input or a tool’s mix slider between 0 and 1 you could use an expression:

frame == 1025

This will set the knob to 1 on frame 1025 and to 0 anywhere else. An expression like that also works if you want to enable that knob on several frames, but it gets increasingly unreadable:

frame == 1025 || frame == 1072 || frame == 1074

TCL expression switch

A Python expression is shorter and easier to extend. Enable the Py button in the expression popup and there you go:

nuke.frame() in [1025,1072,1074]

Python expression switch

Tags: ,

One Comment

  • Dunn says:

    Cool! Wish we had something like that in our Other fav comp software ;-)

Leave a Reply

XHTML: You can use these tags:
<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code lang=""> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> <pre lang="" extra="">