Add Blend Import

[fire]

Fixes godotengine/godot-proposals#3529

Discussed with the Godot Discord community and with Reduz.

[lyuma]

Just chatted with @fire and I think it would make more sense to move the blender path into EditorSettings, since I do not want to input my blender executable path in every single project on windows, and also would not want to check it into version control by mistake.

I am also apprehensive about the settings for the blender python scripts being per-project. There was an idea of some use-case where a user customizes the blender export to hack in additional features, but my opinion is that level of customization would be best left to custom GDScript addons.

Hardcoding the python strings would be easiest. I'd also be ok with having the scripts as an editor setting.

[fire]

QA tested reports

• skeletons sometimes loses mesh
• exporting godot uses the default cube, light and camera.

Checked means there is a bugfix in for the issues.

[akien-mga]

I pushed updates (for now as a separate commit) to https://github.com/akien-mga/godot/tree/blend-io to move the class in modules/gltf/editor/ as discussed, and I did some cleanup, adding comments and improving overall code quality and settings validation. I couldn't force push to the V-Sekai fork to update this PR as it seems maintainer pushes have been disabled.

It's still not perfect though, whether the import can be done is validated on editor init, so enabling Blend import requires first setting the Blender path, and then enabling the option. Otherwise before my changes you would enter import hell since it would fail repeatedly until you kill Godot, and now after my changes it will just not register the importer. But that's part of what @reduz is going to improve in a follow-up.

Otherwise, I tested the version check and it doesn't seem to work. Picking a Blender 2.93 binary, I did not see Blender is 3.0 or higher is required., and instead it proceeded to run the script and fail (also repeatedly since Godot always retries after failing, but that's a separate issue).

I renamed the blender section in the settings to blend as that's what the format is called.

[fire]

I saw your message. I'll update the V-Sekai fork promptly.

[fire]

Can leave the version check and the validation on editor initialization to future commits.

Thanks!

[akien-mga]

Seems like I broke the editor with a last minute change, will fix.

[akien-mga]

@fire I updated my branch if you can push to this PR again: https://github.com/akien-mga/godot/tree/blend-io

[akien-mga]

Thanks!

[rcorre]

When I start the editor, I only see "Blender Path" in EditorSettings, not "Import Enabled", and just setting "Blender Path" does not seem to enable blend imports.

Edit: NVM, it is a project setting, and you have to check "advanced settings" to see it

[Zireael07]

Where do I find the docs on this? Does this support geometry nodes?

[rcorre]

@Zireael07 it just exports to gltf behind-the-scenes, so feature-wise it is the same as https://docs.godotengine.org/en/3.4/tutorials/assets_pipeline/importing_scenes.html.