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.. index:: Grease Pencil Modifiers; Hook Modifier
.. _bpy.types.GreasePencilHookModifier:
*************
Hook Modifier
*************
The *Hook* Modifier is used to deform stroke points using another object
(usually an empty or a bone but it can be any object).
As the hook moves, it pulls points from the strokes with it.
You can think of it as animated
:doc:`Proportional Editing </editors/3dview/controls/proportional_editing>`.
.. seealso::
This documentation refers to the Hook Modifier specific to the Grease Pencil object.
For uses with other object types refer to the general :doc:`/modeling/modifiers/deform/hooks`.
Options
=======
.. figure:: /images/grease-pencil_modifiers_deform_hook_panel.png
:align: right
:width: 300px
The Hook modifier.
Object
The name of the object to hook points to.
Vertex Group
Restricts the effect only to a vertex group.
Strength
Adjust this hooks influence on the stroke points, were (0.0 to 1.0) (no change to fully follow the hook).
Falloff
-------
Type
This can be used to adjust the type of curve for the Strength attenuation.
You can also define a custom curve to get a much higher level of control.
Radius
The size of the hooks influence.
Uniform Falloff
This setting is useful when using hooks on scaled objects,
especially in cases where non-uniform scale would stretch the result of the hook.
Influence
---------
See :ref:`grease-pencil-modifier-influence-filters`.
.. note::
The Hook Modifier stores points indices from the original strokes to determine what to affect;
this means that modifiers that generate geometry, like a Subdivision Surface Modifier,
should always be applied **after** the Hook Modifier;
otherwise the generated geometry will be left out of the hook's influence.
Example
=======
.. figure:: /images/grease-pencil_modifiers_deform_hook_sample.png
Empty used as a hook to manipulate a vertex group (right eye of the monkey).
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