Knob names

[teiden_zero]

Hello everybody, I'm quite new in nuke scripting and i'm facing this problem: how do I know knob names? and their values?
For example, I want to get the value of current zoom value inside Viewer1.
I know I can access the viewer using

nuke.activeViewer()

I found an example on the net that uses

nuke.activeViewer().node()['channels'].setValue('depth')

this one sets the current viewer's channels on "depth", and you can actually see the knob changing its value on the viewer.

Let's say I want to access the zoom: what is its name? what are its properties? How can I find one knob's name by myself?

Thank you very much, help is much apreciated

[zoostory]

You can derive the knobs of any node by simply copying the node and pasting the values into any text editor. Within the brackets for the node properties, the first value will be the knob, the following values will be the values of that knob.

For example, I made a text node "Text1"

Copying and pasting it you get this:


set cut_paste_input [stack 0]
version 6.2 v4
push $cut_paste_input
Text {
font C:/Windows/Fonts/arial.ttf
yjustify center
box {480 270 1440 810}
center {960 540}
name Text1
selected true
xpos -768
ypos 453
}


I know xpos is the knob and -768 is the value.

You can also hover over most properties in the properties pane to get a pop up note that tells you the name of the knob.

Simple syntax to get the value of a knob is like this:

print nuke.toNode('Text1')['xpos'].value()

That will return the Text1 xpos value... You can also put this in a variable instead of print it, or use setValue() instead of "value()" to change it via python.

Hope this helps.

[teiden_zero]

Thank you very much, it has been useful but I still can't understand how to get or change the values of the zoom. It looks like the zoom doesn't have a pop up note with a name. Any guess?

[zoostory]

You can search all the root and active viewer knobs via these snippets, but I can't find anything for yah

myView = nuke.activeViewer().node()
for n in myView.knobs():
print str(n) + " " + str(myView.knob(n).value())


myView = nuke.root()
for n in myView.knobs():
print str(n) + " " + str(myView.knob(n).value())

[teiden_zero]

You have been very useful anyway!
This zoom thing looks very misterious
So strange there is no way to get this little number!