Objects location data after location keyframe

Technical Support Particles and Physics Simulations
1

I have created a scene where a cube and a sphere collide with each other. The collision takes place in the 20th frame and on the 12th frame I have turned off the kinematic properties of both the cube and the sphere. This results the following animation:

com-video-to-gif

Then I wanted to check the object’s location after the collision so I used the following script:

for i,frame in enumerate(range(1,bpy.data.scenes[0].frame_end)):
    bpy.context.scene.frame_set(frame)
    print(i,bpy.data.objects['Cube'].location, bpy.data.objects['Sphere'].location)

Something wired happened the location of the objects didn’t change after the 20th frame although it is easy to see that in the animation the objects continue to move even after the 200th frame. What causes this problem and how can I fix it?
collision.blend (742.1 KB)

2

Hi,

hard to have a look without the .blend, but I would say :
Keep in mind that bpy.data.objects['Cube'].location is by default local. For example, if the cube is set to (0., 0., 0.) and you parent it to a sphere, then when you move the sphere, the cube follow the sphere, but bpy.data.objects['Cube'].location still returns (0., 0., 0.)

To get the actual “real” location of some object, regardless of parenting, simulation, etc… You need to use :
obj.matrix_world.to_translation()

I’m not sure it will solve your specific problem, but that can be a clue …

See you :slight_smile: ++
Tricotou

3

Solved!
obj.matrix_world.translation gives the global location of a certain object.
@tricotou thank you for the hint!