Nuke expression to find center of format size

[dodger]

Hi all,

I'm currently working on a gizmo that includes a GodRays node. What i want to do is have it so that the "center" parameter in my GodRays node is always in the middle of whatever footage you have piped into it.

So i was hoping there is some form of expression that can find the vertical and horizontal size of the source and then divide them by 2 to find the center automatically.

thanks in advance

[Gentle Fury]

i don't know the code offhand but wouldn't it be something like root.format/2 on x and y?

[nathan]

Root is the Nuke scripts format not a nodes.

[value somenode.width] [value somenode.format.width]

[dodger]

hi,

Nathan, whats the deal with the nfx plugins tried to download them today but no dice.

Anyway thanks for the reply,

awesome

[Diogo Girondi]

input.format.w/2
input.format.h/2

on the center x y field of your GodRays.

[rueter]

if the node itself doesn't change the format (i.e. like a crop node), you can just use "width/2 and height/2, otherwise you need to include the "input." bit like Diogo is suggesting.