# BuildGpencilModifier(GpencilModifier)

base classes — `bpy_struct`, `GpencilModifier`

class `bpy.types.``BuildGpencilModifier`(GpencilModifier)

  Animate strokes appearing and disappearing

  `concurrent_time_alignment`

    When should strokes start to appear/disappear

    - `START` Align Start, All strokes start at same time (i.e. short strokes finish earlier).
    - `END` Align End, All strokes end at same time (i.e. short strokes start later).

    Type: | enum in [‘START’, ‘END’], default ‘START’

  `frame_end`

    End Frame (when Restrict Frame Range is enabled)

    Type: | float in [-1.04857e+06, 1.04857e+06], default 0.0

  `frame_start`

    Start Frame (when Restrict Frame Range is enabled)

    Type: | float in [-1.04857e+06, 1.04857e+06], default 0.0

  `invert_layer_pass`

    Inverse filter

    Type: | boolean, default False

  `invert_layers`

    Inverse filter

    Type: | boolean, default False

  `layer`

    Layer name

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

  `layer_pass`

    Layer pass index

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

  `length`

    Maximum number of frames that the build effect can run for (unless another GP keyframe occurs before this time has elapsed)

    Type: | float in [1, 1.04857e+06], default 0.0

  `mode`

    How many strokes are being animated at a time

    - `SEQUENTIAL` Sequential, Strokes appear/disappear one after the other, but only a single one changes at a time.
    - `CONCURRENT` Concurrent, Multiple strokes appear/disappear at once.

    Type: | enum in [‘SEQUENTIAL’, ‘CONCURRENT’], default ‘SEQUENTIAL’

  `start_delay`

    Number of frames after each GP keyframe before the modifier has any effect

    Type: | float in [0, 1.04857e+06], default 0.0

  `transition`

    How are strokes animated (i.e. are they appearing or disappearing)

    - `GROW` Grow, Show points in the order they occur in each stroke (e.g. for animating lines being drawn).
    - `SHRINK` Shrink, Hide points from the end of each stroke to the start (e.g. for animating lines being erased).
    - `FADE` Fade, Hide points in the order they occur in each stroke (e.g. for animating ink fading or vanishing after getting drawn).

    Type: | enum in [‘GROW’, ‘SHRINK’, ‘FADE’], default ‘GROW’

  `use_restrict_frame_range`

    Only modify strokes during the specified frame range

    Type: | boolean, default False

  classmethod `bl_rna_get_subclass`(id, default=None)

    Parameters: | id (string) – The RNA type identifier.
    Returns: | The RNA type or default when not found.
    Return type: | `bpy.types.Struct` subclass

  classmethod `bl_rna_get_subclass_py`(id, default=None)

    Parameters: | id (string) – The RNA type identifier.
    Returns: | The class or default when not found.
    Return type: | type

Inherited Properties

`bpy_struct.id_data` `GpencilModifier.name` `GpencilModifier.type` `GpencilModifier.show_viewport` | `GpencilModifier.show_render` `GpencilModifier.show_in_editmode` `GpencilModifier.show_expanded`

Inherited Functions

`bpy_struct.as_pointer` `bpy_struct.driver_add` `bpy_struct.driver_remove` `bpy_struct.get` `bpy_struct.is_property_hidden` `bpy_struct.is_property_overridable_library` `bpy_struct.is_property_readonly` `bpy_struct.is_property_set` `bpy_struct.items` `bpy_struct.keyframe_delete` | `bpy_struct.keyframe_insert` `bpy_struct.keys` `bpy_struct.path_from_id` `bpy_struct.path_resolve` `bpy_struct.pop` `bpy_struct.property_overridable_library_set` `bpy_struct.property_unset` `bpy_struct.type_recast` `bpy_struct.values`