# FModifier(bpy_struct)

base class — `bpy_struct`

subclasses — `FModifierCycles`, `FModifierEnvelope`, `FModifierFunctionGenerator`, `FModifierGenerator`, `FModifierLimits`, `FModifierNoise`, `FModifierPython`, `FModifierStepped`

class `bpy.types.``FModifier`(bpy_struct)

  Modifier for values of F-Curve

  `active`

    F-Curve Modifier is the one being edited

    Type: | boolean, default False

  `blend_in`

    Number of frames from start frame for influence to take effect

    Type: | float in [-inf, inf], default 0.0

  `blend_out`

    Number of frames from end frame for influence to fade out

    Type: | float in [-inf, inf], default 0.0

  `frame_end`

    Frame that modifier’s influence ends (if Restrict Frame Range is in use)

    Type: | float in [-inf, inf], default 0.0

  `frame_start`

    Frame that modifier’s influence starts (if Restrict Frame Range is in use)

    Type: | float in [-inf, inf], default 0.0

  `influence`

    Amount of influence F-Curve Modifier will have when not fading in/out

    Type: | float in [0, 1], default 1.0

  `is_valid`

    F-Curve Modifier has invalid settings and will not be evaluated

    Type: | boolean, default False, (readonly)

  `mute`

    Disable F-Curve Modifier evaluation

    Type: | boolean, default False

  `show_expanded`

    F-Curve Modifier’s panel is expanded in UI

    Type: | boolean, default False

  `type`

    F-Curve Modifier Type

    - `NULL` Invalid.
    - `GENERATOR` Generator, Generate a curve using a factorized or expanded polynomial.
    - `FNGENERATOR` Built-In Function, Generate a curve using standard math functions such as sin and cos.
    - `ENVELOPE` Envelope, Reshape F-Curve values - e.g. change amplitude of movements.
    - `CYCLES` Cycles, Cyclic extend/repeat keyframe sequence.
    - `NOISE` Noise, Add pseudo-random noise on top of F-Curves.
    - `LIMITS` Limits, Restrict maximum and minimum values of F-Curve.
    - `STEPPED` Stepped Interpolation, Snap values to nearest grid-step - e.g. for a stop-motion look.

    Type: | enum in [‘NULL’, ‘GENERATOR’, ‘FNGENERATOR’, ‘ENVELOPE’, ‘CYCLES’, ‘NOISE’, ‘LIMITS’, ‘STEPPED’], default ‘NULL’, (readonly)

  `use_influence`

    F-Curve Modifier’s effects will be tempered by a default factor

    Type: | boolean, default False

  `use_restricted_range`

    F-Curve Modifier is only applied for the specified frame range to help mask off effects in order to chain them

    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` |

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`

References

`FCurve.modifiers` `FCurveModifiers.active` `FCurveModifiers.new` | `FCurveModifiers.remove` `NlaStrip.modifiers`