godot-docs/classes/class_engine.rst

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.. Generated automatically from Godot engine sources.
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.. _class_Engine:

Engine
======

**Inherits:** :ref:`Object<class_Object>`

Access to engine properties.

.. rst-class:: classref-introduction-group

Description
-----------

The **Engine** singleton allows you to query and modify the project's run-time parameters, such as frames per second, time scale, and others.

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`int<class_int>`     | :ref:`max_fps<class_Engine_property_max_fps>`                                         | ``0``    |
   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`int<class_int>`     | :ref:`max_physics_steps_per_frame<class_Engine_property_max_physics_steps_per_frame>` | ``8``    |
   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`float<class_float>` | :ref:`physics_jitter_fix<class_Engine_property_physics_jitter_fix>`                   | ``0.5``  |
   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`int<class_int>`     | :ref:`physics_ticks_per_second<class_Engine_property_physics_ticks_per_second>`       | ``60``   |
   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`bool<class_bool>`   | :ref:`print_error_messages<class_Engine_property_print_error_messages>`               | ``true`` |
   +---------------------------+---------------------------------------------------------------------------------------+----------+
   | :ref:`float<class_float>` | :ref:`time_scale<class_Engine_property_time_scale>`                                   | ``1.0``  |
   +---------------------------+---------------------------------------------------------------------------------------+----------+

.. rst-class:: classref-reftable-group

Methods
-------

.. table::
   :widths: auto

   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                       | :ref:`get_architecture_name<class_Engine_method_get_architecture_name>` **(** **)** |const|                                                                  |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Dictionary<class_Dictionary>`               | :ref:`get_author_info<class_Engine_method_get_author_info>` **(** **)** |const|                                                                              |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Dictionary[]<class_Dictionary>`             | :ref:`get_copyright_info<class_Engine_method_get_copyright_info>` **(** **)** |const|                                                                        |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Dictionary<class_Dictionary>`               | :ref:`get_donor_info<class_Engine_method_get_donor_info>` **(** **)** |const|                                                                                |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                             | :ref:`get_frames_drawn<class_Engine_method_get_frames_drawn>` **(** **)**                                                                                    |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                         | :ref:`get_frames_per_second<class_Engine_method_get_frames_per_second>` **(** **)** |const|                                                                  |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Dictionary<class_Dictionary>`               | :ref:`get_license_info<class_Engine_method_get_license_info>` **(** **)** |const|                                                                            |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                       | :ref:`get_license_text<class_Engine_method_get_license_text>` **(** **)** |const|                                                                            |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`MainLoop<class_MainLoop>`                   | :ref:`get_main_loop<class_Engine_method_get_main_loop>` **(** **)** |const|                                                                                  |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                             | :ref:`get_physics_frames<class_Engine_method_get_physics_frames>` **(** **)** |const|                                                                        |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                         | :ref:`get_physics_interpolation_fraction<class_Engine_method_get_physics_interpolation_fraction>` **(** **)** |const|                                        |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                             | :ref:`get_process_frames<class_Engine_method_get_process_frames>` **(** **)** |const|                                                                        |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`ScriptLanguage<class_ScriptLanguage>`       | :ref:`get_script_language<class_Engine_method_get_script_language>` **(** :ref:`int<class_int>` index **)** |const|                                          |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                             | :ref:`get_script_language_count<class_Engine_method_get_script_language_count>` **(** **)**                                                                  |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Object<class_Object>`                       | :ref:`get_singleton<class_Engine_method_get_singleton>` **(** :ref:`StringName<class_StringName>` name **)** |const|                                         |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PackedStringArray<class_PackedStringArray>` | :ref:`get_singleton_list<class_Engine_method_get_singleton_list>` **(** **)** |const|                                                                        |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Dictionary<class_Dictionary>`               | :ref:`get_version_info<class_Engine_method_get_version_info>` **(** **)** |const|                                                                            |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                       | :ref:`get_write_movie_path<class_Engine_method_get_write_movie_path>` **(** **)** |const|                                                                    |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                           | :ref:`has_singleton<class_Engine_method_has_singleton>` **(** :ref:`StringName<class_StringName>` name **)** |const|                                         |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                           | :ref:`is_editor_hint<class_Engine_method_is_editor_hint>` **(** **)** |const|                                                                                |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                           | :ref:`is_in_physics_frame<class_Engine_method_is_in_physics_frame>` **(** **)** |const|                                                                      |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                              | :ref:`register_script_language<class_Engine_method_register_script_language>` **(** :ref:`ScriptLanguage<class_ScriptLanguage>` language **)**               |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                              | :ref:`register_singleton<class_Engine_method_register_singleton>` **(** :ref:`StringName<class_StringName>` name, :ref:`Object<class_Object>` instance **)** |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                              | :ref:`unregister_singleton<class_Engine_method_unregister_singleton>` **(** :ref:`StringName<class_StringName>` name **)**                                   |
   +---------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Property Descriptions
---------------------

.. _class_Engine_property_max_fps:

.. rst-class:: classref-property

:ref:`int<class_int>` **max_fps** = ``0``

.. rst-class:: classref-property-setget

- void **set_max_fps** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_max_fps** **(** **)**

The maximum number of frames per second that can be rendered. A value of ``0`` means "no limit". The actual number of frames per second may still be below this value if the CPU or GPU cannot keep up with the project logic and rendering.

Limiting the FPS can be useful to reduce system power consumption, which reduces heat and noise emissions (and improves battery life on mobile devices).

If :ref:`ProjectSettings.display/window/vsync/vsync_mode<class_ProjectSettings_property_display/window/vsync/vsync_mode>` is ``Enabled`` or ``Adaptive``, it takes precedence and the forced FPS number cannot exceed the monitor's refresh rate.

If :ref:`ProjectSettings.display/window/vsync/vsync_mode<class_ProjectSettings_property_display/window/vsync/vsync_mode>` is ``Enabled``, on monitors with variable refresh rate enabled (G-Sync/FreeSync), using a FPS limit a few frames lower than the monitor's refresh rate will `reduce input lag while avoiding tearing <https://blurbusters.com/howto-low-lag-vsync-on/>`__.

If :ref:`ProjectSettings.display/window/vsync/vsync_mode<class_ProjectSettings_property_display/window/vsync/vsync_mode>` is ``Disabled``, limiting the FPS to a high value that can be consistently reached on the system can reduce input lag compared to an uncapped framerate. Since this works by ensuring the GPU load is lower than 100%, this latency reduction is only effective in GPU-bottlenecked scenarios, not CPU-bottlenecked scenarios.

See also :ref:`physics_ticks_per_second<class_Engine_property_physics_ticks_per_second>` and :ref:`ProjectSettings.application/run/max_fps<class_ProjectSettings_property_application/run/max_fps>`.

.. rst-class:: classref-item-separator

----

.. _class_Engine_property_max_physics_steps_per_frame:

.. rst-class:: classref-property

:ref:`int<class_int>` **max_physics_steps_per_frame** = ``8``

.. rst-class:: classref-property-setget

- void **set_max_physics_steps_per_frame** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_max_physics_steps_per_frame** **(** **)**

Controls the maximum number of physics steps that can be simulated each rendered frame. The default value is tuned to avoid "spiral of death" situations where expensive physics simulations trigger more expensive simulations indefinitely. However, the game will appear to slow down if the rendering FPS is less than ``1 / max_physics_steps_per_frame`` of :ref:`physics_ticks_per_second<class_Engine_property_physics_ticks_per_second>`. This occurs even if ``delta`` is consistently used in physics calculations. To avoid this, increase :ref:`max_physics_steps_per_frame<class_Engine_property_max_physics_steps_per_frame>` if you have increased :ref:`physics_ticks_per_second<class_Engine_property_physics_ticks_per_second>` significantly above its default value.

.. rst-class:: classref-item-separator

----

.. _class_Engine_property_physics_jitter_fix:

.. rst-class:: classref-property

:ref:`float<class_float>` **physics_jitter_fix** = ``0.5``

.. rst-class:: classref-property-setget

- void **set_physics_jitter_fix** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_physics_jitter_fix** **(** **)**

Controls how much physics ticks are synchronized with real time. For 0 or less, the ticks are synchronized. Such values are recommended for network games, where clock synchronization matters. Higher values cause higher deviation of the in-game clock and real clock but smooth out framerate jitters. The default value of 0.5 should be fine for most; values above 2 could cause the game to react to dropped frames with a noticeable delay and are not recommended.

\ **Note:** For best results, when using a custom physics interpolation solution, the physics jitter fix should be disabled by setting :ref:`physics_jitter_fix<class_Engine_property_physics_jitter_fix>` to ``0``.

.. rst-class:: classref-item-separator

----

.. _class_Engine_property_physics_ticks_per_second:

.. rst-class:: classref-property

:ref:`int<class_int>` **physics_ticks_per_second** = ``60``

.. rst-class:: classref-property-setget

- void **set_physics_ticks_per_second** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_physics_ticks_per_second** **(** **)**

The number of fixed iterations per second. This controls how often physics simulation and :ref:`Node._physics_process<class_Node_method__physics_process>` methods are run. This value should generally always be set to ``60`` or above, as Godot doesn't interpolate the physics step. As a result, values lower than ``60`` will look stuttery. This value can be increased to make input more reactive or work around collision tunneling issues, but keep in mind doing so will increase CPU usage. See also :ref:`max_fps<class_Engine_property_max_fps>` and :ref:`ProjectSettings.physics/common/physics_ticks_per_second<class_ProjectSettings_property_physics/common/physics_ticks_per_second>`.

\ **Note:** Only :ref:`max_physics_steps_per_frame<class_Engine_property_max_physics_steps_per_frame>` physics ticks may be simulated per rendered frame at most. If more physics ticks have to be simulated per rendered frame to keep up with rendering, the project will appear to slow down (even if ``delta`` is used consistently in physics calculations). Therefore, it is recommended to also increase :ref:`max_physics_steps_per_frame<class_Engine_property_max_physics_steps_per_frame>` if increasing :ref:`physics_ticks_per_second<class_Engine_property_physics_ticks_per_second>` significantly above its default value.

.. rst-class:: classref-item-separator

----

.. _class_Engine_property_print_error_messages:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **print_error_messages** = ``true``

.. rst-class:: classref-property-setget

- void **set_print_error_messages** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_printing_error_messages** **(** **)**

If ``false``, stops printing error and warning messages to the console and editor Output log. This can be used to hide error and warning messages during unit test suite runs. This property is equivalent to the :ref:`ProjectSettings.application/run/disable_stderr<class_ProjectSettings_property_application/run/disable_stderr>` project setting.

\ **Warning:** If you set this to ``false`` anywhere in the project, important error messages may be hidden even if they are emitted from other scripts. If this is set to ``false`` in a ``@tool`` script, this will also impact the editor itself. Do *not* report bugs before ensuring error messages are enabled (as they are by default).

\ **Note:** This property does not impact the editor's Errors tab when running a project from the editor.

.. rst-class:: classref-item-separator

----

.. _class_Engine_property_time_scale:

.. rst-class:: classref-property

:ref:`float<class_float>` **time_scale** = ``1.0``

.. rst-class:: classref-property-setget

- void **set_time_scale** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_time_scale** **(** **)**

Controls how fast or slow the in-game clock ticks versus the real life one. It defaults to 1.0. A value of 2.0 means the game moves twice as fast as real life, whilst a value of 0.5 means the game moves at half the regular speed.

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Method Descriptions
-------------------

.. _class_Engine_method_get_architecture_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_architecture_name** **(** **)** |const|

Returns the name of the CPU architecture the Godot binary was built for. Possible return values are ``x86_64``, ``x86_32``, ``arm64``, ``armv7``, ``rv64``, ``riscv``, ``ppc64``, ``ppc``, ``wasm64`` and ``wasm32``.

To detect whether the current CPU architecture is 64-bit, you can use the fact that all 64-bit architecture names have ``64`` in their name:


.. tabs::

 .. code-tab:: gdscript

    if "64" in Engine.get_architecture_name():
        print("Running on 64-bit CPU.")
    else:
        print("Running on 32-bit CPU.")

 .. code-tab:: csharp

    if (Engine.GetArchitectureName().Contains("64"))
        GD.Print("Running on 64-bit CPU.");
    else
        GD.Print("Running on 32-bit CPU.");



\ **Note:** :ref:`get_architecture_name<class_Engine_method_get_architecture_name>` does *not* return the name of the host CPU architecture. For example, if running an x86_32 Godot binary on a x86_64 system, the returned value will be ``x86_32``.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_author_info:

.. rst-class:: classref-method

:ref:`Dictionary<class_Dictionary>` **get_author_info** **(** **)** |const|

Returns engine author information in a Dictionary.

\ ``lead_developers``    - Array of Strings, lead developer names

\ ``founders``           - Array of Strings, founder names

\ ``project_managers``   - Array of Strings, project manager names

\ ``developers``         - Array of Strings, developer names

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_copyright_info:

.. rst-class:: classref-method

:ref:`Dictionary[]<class_Dictionary>` **get_copyright_info** **(** **)** |const|

Returns an Array of copyright information Dictionaries.

\ ``name``    - String, component name

\ ``parts``   - Array of Dictionaries {``files``, ``copyright``, ``license``} describing subsections of the component

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_donor_info:

.. rst-class:: classref-method

:ref:`Dictionary<class_Dictionary>` **get_donor_info** **(** **)** |const|

Returns a Dictionary of Arrays of donor names.

{``platinum_sponsors``, ``gold_sponsors``, ``silver_sponsors``, ``bronze_sponsors``, ``mini_sponsors``, ``gold_donors``, ``silver_donors``, ``bronze_donors``}

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_frames_drawn:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_frames_drawn** **(** **)**

Returns the total number of frames drawn. On headless platforms, or if the render loop is disabled with ``--disable-render-loop`` via command line, :ref:`get_frames_drawn<class_Engine_method_get_frames_drawn>` always returns ``0``. See :ref:`get_process_frames<class_Engine_method_get_process_frames>`.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_frames_per_second:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_frames_per_second** **(** **)** |const|

Returns the frames per second of the running game.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_license_info:

.. rst-class:: classref-method

:ref:`Dictionary<class_Dictionary>` **get_license_info** **(** **)** |const|

Returns Dictionary of licenses used by Godot and included third party components.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_license_text:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_license_text** **(** **)** |const|

Returns Godot license text.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_main_loop:

.. rst-class:: classref-method

:ref:`MainLoop<class_MainLoop>` **get_main_loop** **(** **)** |const|

Returns the main loop object (see :ref:`MainLoop<class_MainLoop>` and :ref:`SceneTree<class_SceneTree>`).

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_physics_frames:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_physics_frames** **(** **)** |const|

Returns the total number of frames passed since engine initialization which is advanced on each **physics frame**. See also :ref:`get_process_frames<class_Engine_method_get_process_frames>`.

\ :ref:`get_physics_frames<class_Engine_method_get_physics_frames>` can be used to run expensive logic less often without relying on a :ref:`Timer<class_Timer>`:


.. tabs::

 .. code-tab:: gdscript

    func _physics_process(_delta):
        if Engine.get_physics_frames() % 2 == 0:
            pass  # Run expensive logic only once every 2 physics frames here.

 .. code-tab:: csharp

    public override void _PhysicsProcess(double delta)
    {
        base._PhysicsProcess(delta);
    
        if (Engine.GetPhysicsFrames() % 2 == 0)
        {
            // Run expensive logic only once every 2 physics frames here.
        }
    }



.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_physics_interpolation_fraction:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_physics_interpolation_fraction** **(** **)** |const|

Returns the fraction through the current physics tick we are at the time of rendering the frame. This can be used to implement fixed timestep interpolation.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_process_frames:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_process_frames** **(** **)** |const|

Returns the total number of frames passed since engine initialization which is advanced on each **process frame**, regardless of whether the render loop is enabled. See also :ref:`get_frames_drawn<class_Engine_method_get_frames_drawn>` and :ref:`get_physics_frames<class_Engine_method_get_physics_frames>`.

\ :ref:`get_process_frames<class_Engine_method_get_process_frames>` can be used to run expensive logic less often without relying on a :ref:`Timer<class_Timer>`:


.. tabs::

 .. code-tab:: gdscript

    func _process(_delta):
        if Engine.get_process_frames() % 2 == 0:
            pass  # Run expensive logic only once every 2 process (render) frames here.

 .. code-tab:: csharp

    public override void _Process(double delta)
    {
        base._Process(delta);
    
        if (Engine.GetProcessFrames() % 2 == 0)
        {
            // Run expensive logic only once every 2 physics frames here.
        }
    }



.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_script_language:

.. rst-class:: classref-method

:ref:`ScriptLanguage<class_ScriptLanguage>` **get_script_language** **(** :ref:`int<class_int>` index **)** |const|

Returns an instance of a :ref:`ScriptLanguage<class_ScriptLanguage>` with the given index.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_script_language_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_script_language_count** **(** **)**

Returns the number of available script languages. Use with :ref:`get_script_language<class_Engine_method_get_script_language>`.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_singleton:

.. rst-class:: classref-method

:ref:`Object<class_Object>` **get_singleton** **(** :ref:`StringName<class_StringName>` name **)** |const|

Returns a global singleton with given ``name``. Often used for plugins, e.g. GodotPayments.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_singleton_list:

.. rst-class:: classref-method

:ref:`PackedStringArray<class_PackedStringArray>` **get_singleton_list** **(** **)** |const|

Returns a list of available global singletons.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_version_info:

.. rst-class:: classref-method

:ref:`Dictionary<class_Dictionary>` **get_version_info** **(** **)** |const|

Returns the current engine version information in a Dictionary.

\ ``major``    - Holds the major version number as an int

\ ``minor``    - Holds the minor version number as an int

\ ``patch``    - Holds the patch version number as an int

\ ``hex``      - Holds the full version number encoded as a hexadecimal int with one byte (2 places) per number (see example below)

\ ``status``   - Holds the status (e.g. "beta", "rc1", "rc2", ... "stable") as a String

\ ``build``    - Holds the build name (e.g. "custom_build") as a String

\ ``hash``     - Holds the full Git commit hash as a String

\ ``year``     - Holds the year the version was released in as an int

\ ``string``   - ``major`` + ``minor`` + ``patch`` + ``status`` + ``build`` in a single String

The ``hex`` value is encoded as follows, from left to right: one byte for the major, one byte for the minor, one byte for the patch version. For example, "3.1.12" would be ``0x03010C``. **Note:** It's still an int internally, and printing it will give you its decimal representation, which is not particularly meaningful. Use hexadecimal literals for easy version comparisons from code:


.. tabs::

 .. code-tab:: gdscript

    if Engine.get_version_info().hex >= 0x030200:
        # Do things specific to version 3.2 or later
    else:
        # Do things specific to versions before 3.2

 .. code-tab:: csharp

    if ((int)Engine.GetVersionInfo()["hex"] >= 0x030200)
    {
        // Do things specific to version 3.2 or later
    }
    else
    {
        // Do things specific to versions before 3.2
    }



.. rst-class:: classref-item-separator

----

.. _class_Engine_method_get_write_movie_path:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_write_movie_path** **(** **)** |const|

Returns the path to the :ref:`MovieWriter<class_MovieWriter>`'s output file, or an empty string if the engine wasn't started in Movie Maker mode. This path can be absolute or relative depending on how the user specified it.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_has_singleton:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **has_singleton** **(** :ref:`StringName<class_StringName>` name **)** |const|

Returns ``true`` if a singleton with given ``name`` exists in global scope.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_is_editor_hint:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_editor_hint** **(** **)** |const|

Returns ``true`` if the script is currently running inside the editor, ``false`` otherwise. This is useful for ``@tool`` scripts to conditionally draw editor helpers, or prevent accidentally running "game" code that would affect the scene state while in the editor:


.. tabs::

 .. code-tab:: gdscript

    if Engine.is_editor_hint():
        draw_gizmos()
    else:
        simulate_physics()

 .. code-tab:: csharp

    if (Engine.IsEditorHint())
        DrawGizmos();
    else
        SimulatePhysics();



See :doc:`Running code in the editor <../tutorials/plugins/running_code_in_the_editor>` in the documentation for more information.

\ **Note:** To detect whether the script is run from an editor *build* (e.g. when pressing :kbd:`F5`), use :ref:`OS.has_feature<class_OS_method_has_feature>` with the ``"editor"`` argument instead. ``OS.has_feature("editor")`` will evaluate to ``true`` both when the code is running in the editor and when running the project from the editor, but it will evaluate to ``false`` when the code is run from an exported project.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_is_in_physics_frame:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_in_physics_frame** **(** **)** |const|

Returns ``true`` if the game is inside the fixed process and physics phase of the game loop.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_register_script_language:

.. rst-class:: classref-method

void **register_script_language** **(** :ref:`ScriptLanguage<class_ScriptLanguage>` language **)**

Registers a :ref:`ScriptLanguage<class_ScriptLanguage>` instance to be available with ``ScriptServer``.

.. rst-class:: classref-item-separator

----

.. _class_Engine_method_register_singleton:

.. rst-class:: classref-method

void **register_singleton** **(** :ref:`StringName<class_StringName>` name, :ref:`Object<class_Object>` instance **)**

Registers the given object as a singleton, globally available under ``name``.

.. rst-class:: classref-item-separator

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.. _class_Engine_method_unregister_singleton:

.. rst-class:: classref-method

void **unregister_singleton** **(** :ref:`StringName<class_StringName>` name **)**

Unregisters the singleton registered under ``name``. The singleton object is not freed. Only works with user-defined singletons created with :ref:`register_singleton<class_Engine_method_register_singleton>`.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`