I just started scripting on blender no long ago, even tho i have read the API about dependency graph I still have question in what's the difference between "instance_object" and object inside the depsgraph.

Following code from template operator_modal_view3d_raycast.py

  def visible_objects_and_duplis():
    """Loop over (object, matrix) pairs (mesh only)"""

    depsgraph = context.evaluated_depsgraph_get()
    for dup in depsgraph.object_instances:
        if dup.is_instance:  # Real dupli instance
            obj = dup.instance_object
            yield (obj, dup.matrix_world.copy())
        else:  # Usual object
            obj = dup.object
            yield (obj, obj.matrix_world.copy())

I started scripting in Blender not long ago. Even though I have read the API about the dependency graph I still have a question: What is the difference between an instance_object and a "normal" object in the dependency graph?

Following code is from template operator_modal_view3d_raycast.py

  def visible_objects_and_duplis():
    """Loop over (object, matrix) pairs (mesh only)"""

    depsgraph = context.evaluated_depsgraph_get()
    for dup in depsgraph.object_instances:
        if dup.is_instance:  # Real dupli instance
            obj = dup.instance_object
            yield (obj, dup.matrix_world.copy())
        else:  # Usual object
            obj = dup.object
            yield (obj, obj.matrix_world.copy())