Is there any way to call a function on object delete or on changing count of bpy.data.objects?
There is nothing suitable in bpy.app.handlers and I coudn't find something anywhere else.
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1$\begingroup$ could set up a scene_update handler to do this with a global dic or similar and check with something like this blender.stackexchange.com/questions/34860/… $\endgroup$– batFINGEROct 28, 2016 at 9:56
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$\begingroup$ Thanks. I Tried to avoid scene_update handler because it calls too often but it's ok if this is an only option... $\endgroup$– AntonOct 28, 2016 at 10:02
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$\begingroup$ Could use a modal timer operator, or even a draw method to flag change. The scene_update handler is AFAIK the "catch all" way to check on delete. $\endgroup$– batFINGEROct 28, 2016 at 10:26
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2$\begingroup$ You can override the delete function. blender.stackexchange.com/questions/28932/… $\endgroup$– Piotr KowalczykMar 22, 2019 at 14:54
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1 Answer
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Piotr commented that you could override the Delete operator, as described for a different purpose in this answer: https://blender.stackexchange.com/a/28933/66651
I am using it to remove derivative objects. It works very well!
class delete_override(bpy.types.Operator):
"""delete objects and their derivatives"""
bl_idname = "object.delete"
bl_label = "Object Delete Operator"
@classmethod
def poll(cls, context):
return context.active_object is not None
def execute(self, context):
for obj in context.selected_objects:
# replace with your function:
my_function(obj)
bpy.data.objects.remove(obj)
return {'FINISHED'}
def register():
bpy.utils.register_class(delete_override)
def unregister():
bpy.utils.unregister_class(delete_override)
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1$\begingroup$ @Ray, good point! The later one would win. Good enough for experiments, not good enough for release quality. $\endgroup$– boglNov 26 at 11:37