user: Explain GreasePencilShrinkwrapModifier(Modifier) in complete detail according to the official Blender documentation.

assistant: # GreasePencilShrinkwrapModifier(Modifier)

base classes — [`bpy_struct`](bpy.types.bpy_struct.html#bpy.types.bpy_struct "bpy.types.bpy_struct"), [`Modifier`](bpy.types.Modifier.html#bpy.types.Modifier "bpy.types.Modifier")

*class* bpy.types.GreasePencilShrinkwrapModifier(*Modifier*)
:   Shrink wrapping modifier to shrink wrap an object to a target

    auxiliary_target
    :   Additional mesh target to shrink to

        Type:
        :   [`Object`](bpy.types.Object.html#bpy.types.Object "bpy.types.Object")

    cull_face
    :   Stop vertices from projecting to a face on the target when facing towards/away

        Type:
        :   enum in [Shrinkwrap Face Cull Items](bpy_types_enum_items/shrinkwrap_face_cull_items.html#rna-enum-shrinkwrap-face-cull-items), default `'OFF'`

    invert_layer_filter
    :   Invert layer filter

        Type:
        :   boolean, default False

    invert_layer_pass_filter
    :   Invert layer pass filter

        Type:
        :   boolean, default False

    invert_material_filter
    :   Invert material filter

        Type:
        :   boolean, default False

    invert_material_pass_filter
    :   Invert material pass filter

        Type:
        :   boolean, default False

    invert_vertex_group
    :   Invert vertex group weights

        Type:
        :   boolean, default False

    layer_pass_filter
    :   Layer pass filter

        Type:
        :   int in [0, 100], default 0

    material_filter
    :   Material used for filtering

        Type:
        :   [`Material`](bpy.types.Material.html#bpy.types.Material "bpy.types.Material")

    material_pass_filter
    :   Material pass

        Type:
        :   int in [0, 100], default 0

    offset
    :   Distance to keep from the target

        Type:
        :   float in [-inf, inf], default 0.05

    open_influence_panel
    :   Type:
        :   boolean, default False

    project_limit
    :   Limit the distance used for projection (zero disables)

        Type:
        :   float in [0, inf], default 0.0

    smooth_factor
    :   Amount of smoothing to apply

        Type:
        :   float in [0, 1], default 0.05

    smooth_step
    :   Number of times to apply smooth (high numbers can reduce FPS)

        Type:
        :   int in [1, 10], default 1

    subsurf_levels
    :   Number of subdivisions that must be performed before extracting vertices’ positions and normals

        Type:
        :   int in [0, 6], default 0

    target
    :   Mesh target to shrink to

        Type:
        :   [`Object`](bpy.types.Object.html#bpy.types.Object "bpy.types.Object")

    tree_node_filter
    :   Layer name

        Type:
        :   string, default “”, (never None)

    use_invert_cull
    :   When projecting in the negative direction invert the face cull mode

        Type:
        :   boolean, default False

    use_layer_group_filter
    :   Filter by layer group name

        Type:
        :   boolean, default False

    use_layer_pass_filter
    :   Use layer pass filter

        Type:
        :   boolean, default False

    use_material_pass_filter
    :   Use material pass filter

        Type:
        :   boolean, default False

    use_negative_direction
    :   Allow vertices to move in the negative direction of axis

        Type:
        :   boolean, default False

    use_positive_direction
    :   Allow vertices to move in the positive direction of axis

        Type:
        :   boolean, default True

    use_project_x
    :   Type:
        :   boolean, default False

    use_project_y
    :   Type:
        :   boolean, default False

    use_project_z
    :   Type:
        :   boolean, default False

    vertex_group_name
    :   Vertex group name for modulating the deform

        Type:
        :   string, default “”, (never None)

    wrap_method
    :   Type:
        :   enum in [Shrinkwrap Type Items](bpy_types_enum_items/shrinkwrap_type_items.html#rna-enum-shrinkwrap-type-items), default `'NEAREST_SURFACEPOINT'`

    wrap_mode
    :   Select how vertices are constrained to the target surface

        Type:
        :   enum in [Modifier Shrinkwrap Mode Items](bpy_types_enum_items/modifier_shrinkwrap_mode_items.html#rna-enum-modifier-shrinkwrap-mode-items), default `'ON_SURFACE'`

    *classmethod* bl_rna_get_subclass(*id*, *default=None*, */*)
    :   Parameters:
        :   **id** (*str*) – The RNA type identifier.

        Returns:
        :   The RNA type or default when not found.

        Return type:
        :   [`bpy.types.Struct`](bpy.types.Struct.html#bpy.types.Struct "bpy.types.Struct") subclass

    *classmethod* bl_rna_get_subclass_py(*id*, *default=None*, */*)
    :   Parameters:
        :   **id** (*str*) – The RNA type identifier.

        Returns:
        :   The class or default when not found.

        Return type:
        :   type