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My main goal is to achieve that this script file will open My_file.blend, apply my script on it, render and save an image to output path

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  • $\begingroup$ Do you intend that the script also starts Blender or would it already be open? $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 11:52
  • $\begingroup$ I intend that the script also starts Blender, doing the script, and then save an image $\endgroup$
    – cxnt
    Jul 24, 2019 at 11:57
  • $\begingroup$ that will require two separate scripts. One for starting Blender and one for performing actions in Blender. $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 12:06
  • $\begingroup$ See docs.blender.org/manual/en/latest/advanced/command_line/… for more information $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 12:37

2 Answers 2

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I would suggest using the Blender command line interface (CLI) to trigger the script execution and rendering. The CLI is described in the Blender documentation.

For instance you could start Blender from the command line, let it run a python script and then render a frame using the following command (you will have to add the correct paths to the relevant files). The following command renders frame 0 of project.blend after the script.py has been executed.

.\blender.exe project.blend -b -P script.py -o //frame_ -f 0

-b or --background starts Blender without a user interface.

-P or --python allows to run a script.

-o or --render-output defines how the rendered files will be named and where they will be stored. // denotes the current working directory.

-f or --render-frame tells Blender to render a specific frame.

In case you don't want to execute Blender with this command manually, you can use subprocess in a another python script to start Blender. The following function is an example of how you could start Blender from another python script. As arguments you need to pass the path to Blender, the project and the script and it will start another process that runs Blender with these arguments.

import subprocess


def run_blender(blender, project, script):
    output = subprocess.check_output([blender,
                                      project,
                                      '--background',
                                      '--python', script,
                                      '--render-output', '//frame_',
                                      '--render-frame', '0'])
    print(output.decode("utf-8"))
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  • $\begingroup$ Fixed a mistake in the argument order. $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 13:10
  • $\begingroup$ Cool, have you ever tried plumbum I'm addicted to it. $\endgroup$
    – batFINGER
    Jul 24, 2019 at 13:30
  • $\begingroup$ @batFINGER no I haven't, thanks for the tip! $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 13:35
  • $\begingroup$ @rjg Could you please edit this code, add random filepath(arguments), so I know where to put it and how to use it and etc I'm pretty new to coding and blender, I don't understand much. Thanks in advance for helping me $\endgroup$
    – cxnt
    Jul 26, 2019 at 10:14
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Start with the basics

blender --background my.blend --python myscript.py

where myscript.py contains your logic and

bpy.ops.render.render(write_still=True)

To produce the render

in your script you can change just about anything e.g.

bpy.context.scene.render.image_settings.file_format='PNG'

Set the output filename

You can also pass parameters and include multiple python scripts.

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  • $\begingroup$ So I've to create a Script.py and type these lines in it: blender --background my.blend --python myscript.py Right? $\endgroup$
    – cxnt
    Jul 24, 2019 at 11:39
  • $\begingroup$ @cxnt no that is what you type on the command line to start blender and run the script stored in myscript.py $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 11:49
  • $\begingroup$ I ran it in windows 10 cmd, but it doesn't work Should I use Linux? $\endgroup$
    – cxnt
    Jul 24, 2019 at 11:55
  • 1
    $\begingroup$ No Windows is fine, this is likely because blender isn't in your PATH variable and thus it doesn't know what to do with that name. You can either give the full path to your blender.exe or switch to the directory and execute it there. So for example if your Blender is installed in C:\Program Files\Blender Foundation\Blender\blender.exe and your script and .blend file are in C:\Users\user\Documents\Blender then you would use C:\Program Files\Blender Foundation\Blender\blender.exe --background C:\Users\user\Documents\Blender\my.blend --python C:\Users\user\Documents\Blender\myscript.py. $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 12:01
  • $\begingroup$ @cxnt Adjust the paths to the ones were you actually stored the files. $\endgroup$
    – Robert Gützkow
    Jul 24, 2019 at 12:01

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