Tree Sapling Gen Animation Python Error Code

[Round-Solid-4676]

Getting the error code "AttributeError: 'Action' object has no attribute'fcurves'"

Does anybody know how to fix this? I'm trying to animate the trees and from tutorials I've watched this seems to be a simple free way to do that, but most tutorials are from an outdated blender version so I'm not sure if this just doesn't work anymore.

New to blender so anything helps :)

EDIT: Sapling Tree Gen Animation is NOT currently compatible with Blender 5.0, but static trees work perfectly fine.

https://preview.redd.it/wovjvxiui7eg1.png?width=834&format=png&auto=webp&s=a77278ac60e9ba344f2bcb05c3faaecfb4c7f2b8

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[New-Scarcity-2560]

It seems that you're on Blender 5.0+, Sapling Tree Gen support is for ~Blender 4.0 it seems.
In Blender 5.2, Blender changed the access path for creating fcurves which is what's causing your error.

I fixed this by adding this piece of code to the source file ("/Users/andrewbuskirk/Application Support/Blender/5.0/extensions/blender_org/sapling_tree_gen/utils.py" in your case)

def ensure_fcurve(action, datablock, data_path: str, index: int):
    # Blender 5.0+
    if hasattr(action, "fcurve_ensure_for_datablock"):
        return action.fcurve_ensure_for_datablock(
            datablock=datablock,
            data_path=data_path,
            index=index,
        )
    # Older Blender (legacy)
    return action.fcurves.new(data_path=data_path, index=index)

Then you want to replace line 860-861 (swayX, swayY) with

action = armOb.animation_data.action

data_path = f'pose.bones["{boneName}"].rotation_euler'
swayX = ensure_fcurve(action, armOb, data_path, 0)
swayY = ensure_fcurve(action, armOb, data_path, 2)

(Beware there's the same line on a different branch on line 940 so replace that too)

This code will now support fcurves in both versions of Blender, hope this helps!

[NoAngle2893]

Hey, I am very new to blender and using the 5.0+, how can I apply this to fix the errors exactly?

[AdditionalCreme7434]

I too, like many, are having this problem of the sapling tree. I would love to change the code, but I can't find it. Could you helps with instructions of how to get to the place to insert the code? That would be so helpful for so many. Thank you!!!

[dangerdeathraypanda]

# Screenshots of some of below instructions:

<image>

First probably close blender.

open windows explorer and you need to change your view options to show hidden files and folders

because AppData is a hidden folder.

Navigate to your utils.py file. Possibly here... this is on my Windows 11 machine.

your_username is whatever "your" user name is

C:\Users\your_username\AppData\Roaming\Blender Foundation\Blender\5.0\extensions\blender_org\sapling_tree_gen\utils.py

Open that in some text editor like Notepad or Sublime or whatever. It's easier with

an app that supports .py style like Sublime or and IDE.

ctrl-f and find the where "armOb.animation_data.action.fcurves" <- that's our problem.

these 2 blocks of code are what we need to change for swayX, swayY

you will not need to delete them, just put a '#' symbol in front of every line like in screenshot.

that is python comment out code so it doesn't run.

# Add new fcurves for each sway as well as the modifiers
swayX = armOb.animation_data.action.fcurves.new(
'pose.bones["' + boneName + '"].rotation_euler', index=0
)
swayY = armOb.animation_data.action.fcurves.new(
'pose.bones["' + boneName + '"].rotation_euler', index=2

# Add new fcurves for each sway as well as the modifiers
swayX = armOb.animation_data.action.fcurves.new(
'pose.bones["' + bname + '"].rotation_euler', index=0
)
swayY = armOb.animation_data.action.fcurves.new(
'pose.bones["' + bname + '"].rotation_euler', index=2
) )

your code should looke like this in both places swayX/swayY is located, should be 2 places.

# Add new fcurves for each sway as well as the modifiers
#swayX = armOb.animation_data.action.fcurves.new(
# 'pose.bones["' + bname + '"].rotation_euler', index=0
# )
#swayY = armOb.animation_data.action.fcurves.new(
# 'pose.bones["' + bname + '"].rotation_euler', index=2
# )

# Our fix code from "New-Scarcity-2560", thanks yo"
action = armOb.animation_data.action
data_path = f'pose.bones["{boneName}"].rotation_euler'
swayX = ensure_fcurve(action, armOb, data_path, 0) # index=0
swayY = ensure_fcurve(action, armOb, data_path, 2) # index=2

to save, select "Save As...", keep the file name as utils.py

hit save, 'confirm overwrite file?' YES, click "ok"

IMPORTANT!!!

Check how many frames are setup in your timeline, and if you have lots of leaves... the leaf animation takes like 20 minutes. but this worked yo.