Drop-In Ragdoll

@export var ragdoll: DropInRagdoll  # a child of the character's Skeleton3D

func knock_out(attacker_position: Vector3) -> void:
	ragdoll.go_limp(attacker_position.direction_to(global_position) * 4.0)

func _on_ragdoll_came_to_rest() -> void:
	ragdoll.get_up()  # blends back into whatever animation is playing

Price: free, or pay what you want on itch.io.

What it does

• Finds the bones itself. Godot humanoid names, Mixamo, Unreal and MPFB, Blender .L/.R, 3ds Max Biped and VRoid rigs all work with no setup per character. For anything unusual, hand it a BoneMap or a few bone names.
• Fits your character. It sizes its sixteen bodies (hips, spine, chest, head, upper and lower arms, hands, upper and lower legs, feet) to the character's skinned mesh, so a cartoon knight with a huge head gets a huge head.
• Bends the right way. Elbows and knees are hinges that only bend one way, and every limit is measured from the skeleton's rest pose.
• Settles cleanly. Joint damping stops dangling hands swinging, and the body comes to rest in a few seconds instead of twitching on the floor.
• Holds at any scale. A character scaled to 1.3 or 0.5, or one inside a scaled scene, falls exactly like one at 1.0. That's where PhysicalBone3D breaks: here's why.
• Starts from the pose on screen. No snap to a T-pose when physics takes over.
• Keeps momentum. On a CharacterBody3D or RigidBody3D, the ragdoll starts with the body's velocity, so a running character tumbles forward.
• Gets back up. get_up() blends from wherever the body came to rest into your animation, and is_face_up() tells you which get-up animation to play.

Signals and calls

• go_limp(velocity), get_up(blend_seconds) and hit(impulse, at) for knocking a limp body around.
• went_limp, came_to_rest and got_up signals.
• is_limp(), is_resting(), get_body(part) and get_part_position(part) for gameplay checks.

Settings

Everything is an inspector setting: total mass, shape scale, friction, bounce, damping, collision layer and mask, self-collision, and a joint limit for each joint (spine, neck, shoulders, hips, wrists, ankles, elbows, knees).

Requirements

• Godot 4.7. Built and tested on 4.7.2. Pure GDScript, so there's nothing to compile.
• Jolt Physics. Set Project Settings → Physics → 3D → Physics Engine to Jolt Physics. On Godot Physics the joints stretch and bodies may never settle, and the node shows an editor warning until Jolt is set.

Comes with a demo scene and a readme. Install by copying addons/dropin_ragdoll/ into your project: there's no plugin to enable, and DropInRagdoll shows up in the Add Child Node dialog.