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Note: This is not a duplicate of this question: How can I run blender from command line or a python script without opening a GUI?

That question only addresses rendering, not modifying parameters in a closed file without a GUI.

I'm currently rendering a Blender scene using Colab.

The problem is that I have to constantly upload a new file to my Google drive with altered settings if I want to alter settings.

Is it possible to alter parameters (such as a parameter in a node like "Density"), and settings like resolution percentage from the command line or from Python by opening the .blend file and reading and writing to it?

I would need to be able to alter the settings not by opening blender but either through the command line or through python.

Hmm
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  • Sure. Does this answer your question? How can I run blender from command line or a python script without opening a GUI? – brockmann Mar 02 '21 at 20:51
  • Also see: Setting render options from the command line – brockmann Mar 02 '21 at 20:51
  • Sorry I don't think those don't answer my question because those are about setting minimal things like format, and resolution but I want the ability to modify any parameter at all (such as density of a node, number of samples, etc.) either from the command line or from a python script that's not running inside of a blender GUI. – Hmm Mar 02 '21 at 21:25
  • Edit: It seems from a comment underneath an answer it might be possible to modify settings in the command line through a python expression. I will look into this, and if I figure something out, I will post a usage example. Sorry about that. I guess I wanted a straightforward usage example – Hmm Mar 02 '21 at 21:30
  • Updated the answers, Based on the information given in your question, still a dupe IMHO and exactly what you're asking for. As mentioned in both Q&A's, you can run a python script: blender --background --python myscript.py, an expression, or even the console: https://docs.blender.org/manual/en/latest/advanced/command_line/arguments.html#python-options Suggest to add the current state of your code to your question. – brockmann Mar 03 '21 at 08:02

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