All About Natron Python Scripting

[cgvirus]

This thread is dedicated to NATRON PYTHON SCRIPTING ONLY discussions.
Please use the tag natron-python when asking python based questions.
It will help to sort and search Natron python questions for all the users.

For startup Here is the Natron python API:
https://natron-docs.readthedocs.io/en/sphinx_rtd_theme/devel/index.html#developers-guide

[cgvirus]

Some discussions attached:

python function not working ?

Adding : app.getProjectParam(‘frameRange’).setValue(1, 25) to init.py file doesn’t produce any result, nor any error message. Note that every other parameter can be accessed and tweaked using the ‘getProjectParam’ function.

[python] Work with curve

Hi, I was wondering how curves work with python scripts. have you somes examples ? Even if i add somes animations on an effect, i don’t understand how i can edit curve, and i don’t see it in curve editor (ui).

New Natron python scripting GitHub repository

https://github.com/fabiof17/natron-python-scripting Feel free to contribute.

Struggling to retrieve Natron Preferences using python

Is it even possible ? I’m trying to get the ‘diskCachePath’ setting. I’ve tried using the ‘NatronEngine.AppSettings.getParams ()’ for the ‘AppSettings’ class. But script returns an error saying ‘getParams ()’ needs an argument, although doc says it doesn’t require any. If anyone has any clue on this. Thanks.

Having issues. Python -> NatronEngine.AppSettings.getParams()

Hi all, So I’m learning how to navigate Natron with Python, and having trouble. What I’m trying to do is pick an output format in Natron settings. I’m under the impression that before I pick a format, maybe I need to see what formats there are first, therefore, I’m trying to read Natron’s settings via code. According to the docs, NatronEngine.AppSettings.getParams() “Returns a sequence with all Param composing the settings.”. Yet, when I run that function, I get the following error: While exec…

Python variable misnaming ?

The ‘DiskCache’ has its ‘Last Frame’ parameter to be named ‘LastFrame’ with a upper case ‘L’, instead of lower case. Seems to me like a bug.

[python] print some message in script console [solved]

Hello I try to automate Natron for our studio. But I have a problem with printing some message in ScriptEditor console: [console_error] how can I fixet this output? Is the onle way use loging for debug scripts Thank you!

[python] Add menu in left toolbar

Hi, I tried to add menu to the left toolbar Add to the top menu is a very simple from NatronGui import * NatronGui.natron.addMenuCommand("Custom/ReloadReaders", "initGui.reloadSelectedReaders", Qt.Key.Key_R, Qt.KeyboardModifier.ShiftModifier) But I cann’t find how add menu to the toolbar? Thank you

How to connect two nodes using python

I want to merge images using python . I have merged images with merge node but to display that merged file output i need to connect merged node with viewer node . My code is given below app = natron.getGuiInstance(0) read = app.createNode(“net.sf.openfx.MergePlugin”) reader = app.createReader(“C:\Users\Public\Pictures\Sample Pictures\Penguins.jpg”) reader1 = app .createReader(“C:\Users\Public\Pictures\Sample Pictures\Tulips.jpg”) reader2 = app.createReader(“C:\Users\Public\Pictures\Sample P…

issue with Natron 2.3.11 (SOLVED)

Hi to all, i explain the issue,I have installed Natron in Ubuntu 16.04, i upgraded Natron to 2.3.11 with NatronSetup, when i run Natron i get an error about boost version (boost 1.67 is required) so i downloaded the 1.67 boost package’ i compiled it and installed it. And this is fine. But when i run again Natron i get this error instead: ./Natron Natron Version 2.3.11 Copyright (C) 2013-2018 INRIA and Alexandre Gauthier-Foichat Use the --help or -h option to print usage.<<< /home/walte…

How to get current GuiApp instance

Hi, I’m having difficulties getting the app1/app global variable when running a custom python script. I’m receiving this error: NameError: global name ‘app1’ is not defined. Note the script works when running in Natron’s interactive python shell it works. I tried a few approaches, but none have worked so far: I receive a different app instance, which has a subset of the functions app1 has. import NatronGui NatronGui.natron.getGuiInstance(0) Returns a NatronEngine app instance, not gui…

How to set filters for getFilenameDialig()

Hi, Try to use getFilenameDiaglog() to make user picking one exr file. However, I could not figure out how to set filters properly. The documents shows that NatronGui.GuiApp.getFilenameDialog(filters[, location=None]) filters – sequence filters is a list of file extensions that should be displayed in the file dialog. I’ve tried following in script editors but all failed. app1.getFilenameDialog([‘exr’]) app1.getFilenameDialog((‘exr’)) what’s sequence datatype? how to set filters? in li…

[Solved] Error when accessing node by name from `app.NodeName`

I am looking for a way to reference existing node from python inside the GUI (script editor). From the examples/documentation, I extracted the following: from NatronGui import * app = natron.getInstance(0) writer= app.createNode("fr.inria.openfx.WriteOIIO") Nice! A node named “Write5” appears on the Node Graph, but when I try to get it later from another script… app.render(app.Write5, 1,1, 1) AttributeError: 'NatronEngine.App' object has no attribute 'Write5' So this is the documented way, …

NatronRenderer Command Line and Parameterdelivery

Hey there, simple question. As i am new to natron - is it possible to export a GUI-Node-Graph project as python-script for use on command line? Background is: i want to start an in natron with gui done project, but also with flexibility on give command line based parameters such as tell a text-node what text should be shown? So for now I really only need command line without GUI. So I Do have my ntp file with a simple text which scales up about 5 percent. Is it with the natronrenderer out of th…

[Solved] Using multi-line expressions

This expression is incorrect. Multi-line expressions look like this: if frame < 150: ret = frame * 10 else: ret = 150 * 10 See the tooltip for the “Multi-line” button: "When checked the Python expression will be interpreted as series of statement. The return value should be then assigned to the ret variable. When unchecked the expression must not contain any new line character and the result will be interpreted from the interpretation of the single line.

[cgvirus]

How to determine the animation time of a random expression

How can I create an expression that does a random motion in rotation, but does it have a range of frames so that it does not get a very fast animation? I created this expression: Transform1.rotate.random(min=-1, max=1) But the animation gets very fast and I wanted the ascent from -1 to 1 to last 20 frames, otherwise the animation gets very fast and I want a smooth movement. How do I add this time parameter so that the animation lasts 20 and repeats smoothly, going from the minimum to the maxi…

[fabiof17 (Fabrice Fernandez)]

Expression for the ‘Rotate’ parameter.

seed = 10
frequency = 0
amplitude = 0
offset = 10
intensity = 1

ret = (random(seed,frequency)*amplitude)+offset*intensity

Now you see that, by lowering the ‘intensity’ parameter, you lower the global random effect.

intensity = 0 : no rotation at all
intensity = 1 : full random rotation

That’s what i did in this Pyplug :

NatronGitHub/natron-plugins

[cgvirus]

how to get the value for playback in and out point in python

Thanks man. Here is the code for reference: app=app1 pane1 = app.getViewer("Viewer1") range= pane1.getFrameRange() print (range) # Tuple Range print (range[0]) #First frame in range print (range[1]) #Last frame in range Gotcha: To get a PyViewer , use the getViewer(scriptName) function, passing it the script-name of a viewer node.

[ninhenzo64 (Henry van der Beek)]

is it possible to save the script editor contents? i find it really useful in nuke that when i write something in the script editor, it’s restored next time i launch nuke. i was wondering if anything like that’s possible in natron.

[rodlie (Ole-André)]

Hi,

The content is not saved in any way I’m aware of. But, this is probably something we could add.

You could also make a small Python script that (re)store the content of the editor on exit/launch.

[entu_sias]

for some reason my first question in this forum got deleted after some server error last week or so… anyway, i’ve got another question about python scripting in natron… in Text Node, if i check the ‘Auto Size’, can i get an actual canvas size from python expression?