Trying to "bake": object coordinates are not updated while cycling the frames

Coding Python Support
1

I’m writing a script to “bake” the absolute positions of an animation into a file.

Unfortunately, even if I update the frame_current of a scene, neither the local nor the absolute locations are updated.
inserting a Scene.update() didn’t help.
Here is a simple test script (Blend scene in attachment):

import bpy

scene = bpy.context.scene
obj = bpy.context.active_object
print("Baking location for object "+obj.name)

for f in range(scene.frame_start, scene.frame_end+1):
    scene.frame_current = f
    scene.update()
    loc = obj.location
    abs_loc = obj.matrix_world.translation
    print("Frame "+str(f)+" -> loc="+str(obj.location)+" abb_loc="+str(abs_loc))

The output shows the same values for each frame:

Baking location for object Cube
Frame 1 -> loc=<Vector (0.0000, 0.0000, 0.0000)> abb_loc=<Vector (0.0000, 0.0000, 0.0000)>
Frame 2 -> loc=<Vector (0.0000, 0.0000, 0.0000)> abb_loc=<Vector (0.0000, 0.0000, 0.0000)>
...
Frame 25 -> loc=<Vector (0.0000, 0.0000, 0.0000)> abb_loc=<Vector (0.0000, 0.0000, 0.0000)>

How can I solve it?

Attachments

BakeTest.blend (454 KB)

2

Hi

use scene.frame_set(f)

to change frames.


>> C.scene.frame_set(
frame_set()
Scene.frame_set(frame, subframe=0)
Set scene frame updating all objects immediately
3

Yes. It works!