Apply transformations does not work in automated process

Question

I am facing a strange problem with Blender. I start Blender with a script as parameter which is supposed to apply all transformations to an imported fbx model. The import itself works fine.

Part of the code is following:

for o in bpy.context.scene.objects:
        print(o.name)
        o.select = True
        bpy.context.scene.objects.active = o
        bpy.ops.object.transform_apply(location = True, scale = True, rotation = True)
        o.select = False

When running the code like that, Blender does not apply the transformations. Instead it prints:

Warning: Objects have no data to transform

for every single object.

The really starnge thing is, when I paste the exact same script snippet into the editor field and run it, Blender executes it like expected and applies the transformation.

I really tried to find a solution, but did not find one. Thank you in advance!

Answer 1

Make sure that you actually need to apply transformations. If you are writing an exporter, multiplying the object.matrix_world by the vertex position gives you the transformed value without altering the original mesh.

In case you still need to do it, do what batFINGER suggested.

Answer 2

The answer from CoDEmanX to this question actually helped me solve my problem.

How to programmatically load a python script in Text Editor and launch it

I did exactly what is the topic of that post. I was not able to run the code from commandline argument script so I loaded it to the blender text editor and run it from there.

The code in the main function:

filename = os.getcwd() + "\\\src\\python\\blender\\render\\apply.py"
text = bpy.data.texts.load(filename)

for area in bpy.context.screen.areas:
    if area.type == 'TEXT_EDITOR':
        area.spaces[0].text = text # make loaded text file visible

        ctx = bpy.context.copy()
        ctx['edit_text'] = text # specify the text datablock to execute
        ctx['area'] = area # not actually needed...
        ctx['region'] = area.regions[-1] # ... just be nice

        bpy.ops.text.run_script(ctx)
        break

... and apply.py

import bpy

for o in bpy.context.scene.objects:
    o.select = True
    bpy.context.scene.objects.active = o
    bpy.ops.object.transform_apply(location=True, rotation=False, scale=True)

It also looks like as if initially a blend file with a Text Editor field has to be loaded to make that run.

Thanks again for your time and I hope I was also able to help solving future problems.