Blender: Move Object to the floor's center (0,0,0)

blender-auto-floor.py

import bpy

# Get the current context
current_context = bpy.context

# Iterate through all selected objects
for obj in current_context.selected_objects:
    # Get the object's world matrix
    world_matrix = obj.matrix_world

    # Calculate the minimum Z coordinate (lowest point) of the object
    min_z = min((world_matrix @ vertex.co)[2] for vertex in obj.data.vertices)
    world_matrix.translation.z -= min_z

    # Calculate the average X and Y coordinates (center) of the object
    avg_x = sum((world_matrix @ vertex.co)[0] for vertex in obj.data.vertices) / len(obj.data.vertices)
    avg_y = sum((world_matrix @ vertex.co)[1] for vertex in obj.data.vertices) / len(obj.data.vertices)

    # Move the object to the center in X and Y coordinates
    world_matrix.translation.x -= avg_x
    world_matrix.translation.y -= avg_y

# Set the 3D cursor to the floor at (0, 0, 0)
bpy.context.scene.cursor.location = (0, 0, 0)

# Save the previous pivot point setting
previous_pivot_point = bpy.context.scene.tool_settings.transform_pivot_point

# Set the pivot point to the 3D cursor
bpy.context.scene.tool_settings.transform_pivot_point = 'CURSOR'

# Iterate through all selected objects again
for obj in current_context.selected_objects:
    # Set the object's origin to the 3D cursor without moving the object
    bpy.ops.object.select_all(action='DESELECT')
    obj.select_set(True)
    bpy.context.view_layer.objects.active = obj
    bpy.ops.object.mode_set(mode='EDIT')
    bpy.ops.mesh.select_all(action='SELECT')
    bpy.ops.object.mode_set(mode='OBJECT')
    bpy.ops.object.origin_set(type='ORIGIN_CURSOR', center='BOUNDS')

# Restore the previous pivot point setting
bpy.context.scene.tool_settings.transform_pivot_point = previous_pivot_point