StaticBody in Godot 4: it is StaticBody3D now
By Eduardo Orellana · Updated
StaticBody is called StaticBody3D in Godot 4. In a Godot 4 project, extends StaticBody fails to parse with Could not find base class "StaticBody".
AppImage, x86_64. Ubuntu 22.04, Debian 12, Fedora 39 or newer.
Intel or AMD Chromebook, with Linux turned on.
What Godot is checking
GDScript resolves the class after extends when the script loads. StaticBody is not a class in Godot 4, so the script fails to parse and nothing in it runs.
The converter carries StaticBody to StaticBody3D. A static body moved by script, such as a moving platform, should be an AnimatableBody3D in Godot 4, so bodies standing on it are carried along.
Reproduce it
A Godot 3 script that extends StaticBody, in a Godot 4 project. The scene is one Node carrying it.
extends StaticBody
func _ready():
print("ready")
What Godot 4.7.2 prints
Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org
SCRIPT ERROR: Parse Error: Could not find base class "StaticBody".
at: GDScript::reload (res://answers/staticbody-in-godot-4/repro.gd:1)
ERROR: Failed to load script "res://answers/staticbody-in-godot-4/repro.gd" with error "Parse error".
at: load (modules/gdscript/gdscript_resource_format.cpp:46)Fix it
A StaticBody3D with a box collision shape.
extends StaticBody3D
func _ready() -> void:
var shape := CollisionShape3D.new()
shape.shape = BoxShape3D.new()
add_child(shape)
print(get_class(), " layer ", collision_layer, ", shape ", shape.shape.get_class())
What the fixed script prints
Godot Engine v4.7.2.stable.mono.official.ed1daf0bf - https://godotengine.org
StaticBody3D layer 1, shape BoxShape3DVerified on Godot 4.7.2
Both scripts on this page were run headless on Godot 4.7.2 (4.7.2.stable.mono.official.ed1daf0bf) on 18 October 2026, and the output above is what Godot printed, unedited.
Where the check lives in Godot's source: [renames_map_3_to_4.cpp line 1602, StaticBody to StaticBody3D](https://github.com/godotengine/godot/blob/4.7.2-stable/editor/project_upgrade/renames_map_3_to_4.cpp#L1602), [StaticBody3D class reference](https://github.com/godotengine/godot/blob/4.7.2-stable/doc/classes/StaticBody3D.xml).
Questions
- What happened to BoxShape?
- It is BoxShape3D; the 3D shapes all gained the 3D suffix.
- How do I make a moving platform?
- Use an AnimatableBody3D and move it from an AnimationPlayer or a script; bodies on top move with it.