006 How to do math in parameter fields

- [Voiceover] Hi, this is Steve Wright,…welcoming you to this week's Nuke Nugget.…You can save time and mistakes…by using Nuke's window parameter fields…to do math for you.…There are certain local Nuke variables…in each node that you can use…for performing math operations.…They are width, height,…and the color channels RGB and A.…So in this project, I've got the project settings…for the full-size format HD 1080.…However, this checkerboard is a square 1K.…

Now here's a transform node that has the center…for the HD format, 960 by 540.…So when I hook it up to my checkerboard, it's wrong.…And if I of course try to do anything with it,…it's all off-center and wonky.…So we can use parameter window math…to reposition the pivot point…to the exact center like this.…We'll go to the center and I'll say width divided by two.…Bang.…Then height divided by two.…Boom, done.…

Now we've recentered it in the odd-sized image.…Another example, if you want to create a new format.…So I'll click in the node grab,…type up project settings,…