3
You're better off using bpy.data.objects to manipulate them. This way you don't need to rely on what is selected, all you need is the objects name.
import bpy
mod_name = 'My-Mirror-Modifier'
for obj in bpy.data.collections["My-Collection"].all_objects:
if obj.type == 'MESH':
mod = obj.modifiers.new(mod_name, 'MIRROR')
mod....
3
For Blender >2.80 this will work.
Select all your objects and run this in the scripting panel.
import bpy
for object in bpy.context.selected_objects:
obj_loc = object.location
new_empty = bpy.data.objects.new( "empty", None )
new_empty.location = obj_loc
object.parent = new_empty # swap this line around to parent the other way
...
2
For operators use context.
Given the self in the question code, making the assumption you are writing an operator
Further to the answer of @RoufirHassan by way of explanation, looping over the collection objects de-selecting and selecting single, was not changing the active object. Adding context.object to print statement would confirm this.
Is the active ...
2
Put them in a collection
IMO the simplest way to do this is, as suggested
scene_lights = [ob for ob in scene.objects if ob.type == 'LIGHT']
One light object could have the same light data as any or all of the lights in a scene. Even if there are few lights, checking that the data belongs to an object in the scene could prove less efficient than above.
If ...
1
Select all the meshes in your collection and add a mirror modifier.
But as you said it will only mirror the active object ( active object = last object selected with different colored outline). So in order to mirror every single object just type (Ctrl+L) > modifiers. It will link all objects with the same modifier.
You can use it for any other modifiers.
1
You can test whether menu_func is already part of _draw_funcs list and if so, do not prepend:
def register():
bpy.utils.register_class(CUSTOM_OT_operator)
if hasattr(bpy.types.VIEW3D_MT_uv_map.draw, '_draw_funcs'):
if menu_func.__name__ not in (f.__name__ for f in bpy.types.VIEW3D_MT_uv_map.draw._draw_funcs):
bpy.types....
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