UE4 – Python – Placing level actors bottom at Z 0.0

Software:
Unreal Engine 4.22

This simple Unreal Editor Python example sets the Z axis location of all actors with names beginning with ‘Sphere_’ in a way that their bottom (minimum Z bound) is at height 0.0.

Download the script

> learn how to run Python scripts in the UE4 Editor

import unreal
from unreal import Vector

lst_actors = unreal.EditorLevelLibrary.get_all_level_actors()
print('place actors at 0 z')
for act in lst_actors:
    act_label = act.get_actor_label()
    if 'Sphere_' in act_label:
        print('placing: {}'.format(act_label))
        act_location = act.get_actor_location()
        act_bounds = act.get_actor_bounds(False)
        act_min_z = act_bounds[0].z - act_bounds[1].z
        location_offset = Vector(act_location.x, act_location.y, act_location.z - act_min_z)
        act.set_actor_location(location_offset, False, False)

* note that when copying and pasting a script from this example, the indentation may not be pasted correctly.

Note:
The get_actor_bounds unreal.Actor class method returns a tuple object containing 2 unreal.Vector objects, the first being world space location of the actor geometric center, and the second is the corner of the bounding box relative to the center.

‘Sphere_*’ actors before running the script:

‘Sphere_*’ actors after running the script:

Related:
Get started with Python for Unreal Editor
UE4 – Python – Importing assets