Align origin to face for large number of objects

Coding Python Support
1

I am trying to align the origin of a large number of planes to their faces. I have the script to perform this action once, but I can’t find a way to iterate the action for all of the objects. How can I change the active object in a group of selected objects? Or, is there another way? Maybe by name? The objects are named sequentially.

Here is what I have so far:

bpy.ops.object.editmode_toggle()
bpy.ops.mesh.select_all(action='SELECT')

area_type = 'VIEW_3D'
areas  = [area for area in bpy.context.window.screen.areas if area.type == area_type]
bpy.context.scene.tool_settings.use_transform_data_origin = True

with bpy.context.temp_override(area=areas[0]):
    bpy.ops.transform.create_orientation(use=True, overwrite=True)
    bpy.ops.object.editmode_toggle()
    transform_type = bpy.context.scene.transform_orientation_slots[0].type
    bpy.ops.transform.transform(mode='ALIGN', orient_type='Face', orient_matrix_type=transform_type, mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', use_proportional_connected=False, use_proportional_projected=False, snap=False, snap_elements={'INCREMENT'}, use_snap_project=False, snap_target='ACTIVE', use_snap_self=True, use_snap_edit=True, use_snap_nonedit=True, use_snap_selectable=False)
bpy.ops.transform.delete_orientation()
2

To set an object active you can do something like this:

To deselect all objects:
bpy.ops.object.select_all(action=‘DESELECT’)

Your target object:
obj = bpy.data.objects[‘Cube.001’]

Set it active:
bpy.context.view_layer.objects.active = obj

Also, select it:
bpy.context.view_layer.objects.active.select_set(True)

And if you are doing a for loop, you can set object mode instead of toggling it (which might be problematic sometimes):

Set mode to object:
bpy.ops.object.mode_set(mode = ‘OBJECT’)

Set mode to edit:
bpy.ops.object.mode_set(mode = ‘EDIT’)

So I do it like this. Get a list of objects. Loop that list. Deselect all current selected, set target object active and selected. Do some stuff. Repeat until all objects are processed. Especially if using ops.

3

Thank you! I followed your steps, but wound up using the object name.

import bpy

index = 0

for obj in bpy.data.objects:
     
        objectName = f"Leaf.{index}"
        index += 1
        obj = bpy.data.objects[objectName]
        
        bpy.ops.object.select_all(action='DESELECT')
        
        bpy.context.view_layer.objects.active = obj
        
        bpy.context.view_layer.objects.active.select_set(True)
        
        bpy.ops.object.mode_set(mode = 'EDIT')
        bpy.ops.mesh.select_all(action='SELECT')
        
        area_type = 'VIEW_3D'
        areas  = [area for area in bpy.context.window.screen.areas if area.type == area_type]
        bpy.context.scene.tool_settings.use_transform_data_origin = True
        
        with bpy.context.temp_override(area=areas[0]):
            bpy.ops.transform.create_orientation(use=True, overwrite=True)
            bpy.ops.object.editmode_toggle()
            transform_type = bpy.context.scene.transform_orientation_slots[0].type
            bpy.ops.transform.transform(mode='ALIGN', orient_type='Face', orient_matrix_type=transform_type, mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', use_proportional_connected=False, use_proportional_projected=False, snap=False, snap_elements={'INCREMENT'}, use_snap_project=False, snap_target='ACTIVE', use_snap_self=True, use_snap_edit=True, use_snap_nonedit=True, use_snap_selectable=False)
        bpy.ops.transform.delete_orientation()
        
        bpy.ops.object.mode_set(mode = 'OBJECT')