Attention: Here be dragons (unstable version)

This is the latest (unstable) version of this documentation, which may document features not available in or compatible with released stable versions of Redot.

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Upgrading from Redot 4.1 to Redot 4.2

For most games and apps made with 4.1 it should be relatively safe to migrate to 4.2. This page intends to cover everything you need to pay attention to when migrating your project.

Breaking changes

If you are migrating from 4.1 to 4.2, the breaking changes listed here might affect you. Changes are grouped by areas/systems.

Warning

The Mesh resource format has changed in 4.2 to allow for vertex and attribute compression. This allows for improved rendering performance, especially on platforms constrained by memory bandwidth such as mobile.

It is still possible to load the Redot 4.0-4.1 Mesh formats, but it is not possible to load the Redot 4.2 Mesh format in prior Redot versions. When opening a Redot project made with a version prior to 4.2, you may be presented with an upgrade dialog that offers two options:

• Restart & Upgrade: Upgrades the mesh format for all meshes in the project and saves the result to disk. Once chosen, this option prevents downgrading the project to a Redot version prior to 4.2. Set up a version control system and push your changes before choosing this option!

• Upgrade Only: Upgrades the mesh format in-memory without writing it to disk. This allows downgrading the project to a Redot version older than 4.2 if you need to do so in the future. The downside is that loading the project will be slower every time as the mesh format needs to be upgraded every time the project is loaded. These increased loading times will also affect the exported project. The number and complexity of Mesh resources determines how much loading times are affected.

If this dialog doesn't appear, use Project > Tools > Upgrade Mesh Surfaces… at the top of the editor.

This article indicates whether each breaking change affects GDScript and whether the C# breaking change is binary compatible or source compatible:

• Binary compatible - Existing binaries will load and execute successfully without recompilation, and the runtime behavior won't change.

• Source compatible - Source code will compile successfully without changes when upgrading Redot.

Core

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
Node
Constant NOTIFICATION_NODE_RECACHE_REQUESTED removed	❌	✔️	❌	GH-84419

Animation

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
AnimationPlayer
Method _post_process_key_value moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method add_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method advance moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Signal animation_finished moved to base class AnimationMixer	✔️	❌	❌	GH-80813
Signal animation_started moved to base class AnimationMixer	✔️	❌	❌	GH-80813
Signal animation_libraries_updated moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Signal animation_list_changed moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property audio_max_polyphony moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Signal caches_cleared moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method clear_caches moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method find_animation moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method find_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_animation moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_animation_library_list moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_animation_list moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method has_animation moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method has_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property method_call_mode renamed to callback_mode_method and moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property playback_active renamed to active and moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property playback_process_mode renamed to callback_mode_process and moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method remove_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method rename_animation_library moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property reset_on_save moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property root_node moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method set_reset_on_save_enabled moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method seek adds a new update_only optional parameter	✔️	✔️	✔️	GH-80813
AnimationTree
Method _post_process_key_value moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property active moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method advance moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Signal animation_finished moved to base class AnimationMixer	✔️	❌	❌	GH-80813
Signal animation_started moved to base class AnimationMixer	✔️	❌	❌	GH-80813
Property audio_max_polyphony moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_position moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_position_accumulator moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_rotation moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_rotation_accumulator moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_scale moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Method get_root_motion_scale_accumulator moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property process_callback renamed to callback_mode_process and moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property root_motion_track moved to base class AnimationMixer	✔️	✔️	✔️	GH-80813
Property tree_root changes type from AnimationNode to AnimationRootNode	✔️	❌	❌	GH-80813

GUI nodes

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
PopupMenu
Method add_icon_shortcut adds a new allow_echo optional parameter	✔️	✔️	✔️	GH-36493
Method add_shortcut adds a new allow_echo optional parameter	✔️	✔️	✔️	GH-36493
Method clear adds a new free_submenus optional parameter	✔️	✔️	✔️	GH-79965
RichTextLabel
Method add_image adds new key, pad, tooltip, and size_in_percent optional parameters	✔️	✔️	✔️	GH-80410

Rendering

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
ImporterMesh
Method add_surface changes flags parameter type from uint32 to uint64	✔️	✔️	✔️	GH-81138
Method get_surface_format changes return type from uint32 to uint64	✔️	❌	❌	GH-81138
MeshDataTool
Method commit_to_surface adds a new compression_flags optional parameter	✔️	✔️	✔️	GH-81138
Method get_format changes return type from uint32 to uint64	✔️	❌	❌	GH-81138
RenderingDevice
Enum field BarrierMask.BARRIER_MASK_RASTER changes value from 1 to 9	✔️	✔️	✔️	GH-79911
Enum field BarrierMask.BARRIER_MASK_ALL_BARRIERS changes value from 7 to 32767	✔️	✔️	✔️	GH-79911
Enum field BarrierMask.BARRIER_MASK_NO_BARRIER changes value from 8 to 32768	✔️	✔️	✔️	GH-79911
Method shader_create_from_bytecode adds a new placeholder_rid optional parameter	✔️	✔️	✔️	GH-79606
Method shader_get_vertex_input_attribute_ask changes return type from uint32 to uint64	✔️	❌	❌	GH-81138
SurfaceTool
Method commit changes flags parameter type from uint32 to uint64	✔️	✔️	✔️	GH-81138

Text

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
Font
Method set_fallbacks replaced with fallbacks property	✔️	❌	❌	GH-78266
Method get_fallbacks replaced with fallbacks property	✔️	❌	❌	GH-78266
Method find_variation adds new spacing_top, spacing_bottom, spacing_space, and spacing_glyph optional parameters	✔️	✔️	✔️	GH-80954

GraphEdit

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
GraphEdit
Property arrange_nodes_button_hidden renamed to show_arrange_button	❌	✔️	✔️	GH-81582
Method get_zoom_hbox renamed to get_menu_hbox	❌	✔️	✔️	GH-79308
Property snap_distance renamed to snapping_distance	❌	✔️	✔️	GH-79308
Property use_snap renamed to snapping_enabled	❌	✔️	✔️	GH-79308
GraphNode
Property comment removed	❌	❌	❌	GH-79307
Signal close_request renamed to delete_request and moved to base class GraphElement	❌	✔️	✔️	GH-79311
Property draggable moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Property draggable moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Signal dragged moved to base class GraphElement	✔️	❌	❌	GH-79311
Method get_connection_input_color removed	❌	❌	❌	GH-79311
Method get_connection_input_count removed	❌	❌	❌	GH-79311
Method get_connection_input_height removed	❌	❌	❌	GH-79311
Method get_connection_input_position removed	❌	❌	❌	GH-79311
Method get_connection_input_slot removed	❌	❌	❌	GH-79311
Method get_connection_input_type removed	❌	❌	❌	GH-79311
Method get_connection_output_color removed	❌	❌	❌	GH-79311
Method get_connection_output_count removed	❌	❌	❌	GH-79311
Method get_connection_output_height removed	❌	❌	❌	GH-79311
Method get_connection_output_position removed	❌	❌	❌	GH-79311
Method get_connection_output_slot removed	❌	❌	❌	GH-79311
Method get_connection_output_type removed	❌	❌	❌	GH-79311
Property language removed	❌	❌	❌	GH-79311
Signal node_deselected moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Signal node_selected moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Property overlay removed	❌	❌	❌	GH-79311
Property position_offset moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Signal position_offset_changed moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Signal raise_request moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Property resizable moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Signal resize_request moved to base class GraphElement	✔️	❌	❌	GH-79311
Property selectable moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Property selected moved to base class GraphElement	✔️	✔️	✔️	GH-79311
Property show_close removed	❌	❌	❌	GH-79311
Property text_direction removed	❌	❌	❌	GH-79311

TileMap

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
TileMap
Property cell_quadrant_size renamed to rendering_quadrant_size	❌	✔️	✔️	GH-81070

XR

Change	GDScript Compatible	C# Binary Compatible	C# Source Compatible	Introduced
XRInterface
Property environment_blend_mode added	✔️	❌	❌	GH-81561

Note

This change breaks compatibility in C# because the new property conflicts with the name of an existing enum and the C# bindings generator gives priority to properties, so the enum type was renamed from EnvironmentBlendMode to EnvironmentBlendModeEnum.