Godot Rope3D

Physical 3D rope based on PinJoint3D that interacts with RigidBody3D

Installation

Via asset library

Usage

GUI

• Instantiate child scene. Adding child node will not work because Rope3D scene has children
• click Rope3D
• Select start point, end point, adjust other values
• Reference the Rope3D node in code, call rope.make() when you need it

Code

const RopeScene: PackedScene = preload("res://addons/rope3d/Rope3D.tscn")

@onready var start_point = $RigidBody/Node3D
@onready var end_point = $AnotherRigidBody/AnotherNode3D


func _ready():
	var rope = RopeScene.instantiate()
	rope.start_point = start_point
	rope.end_point = end_point
	rope.rope_length = 6.0
	rope.radius = 0.1
	rope.resolution = 6.0   # number of pinjoints
	
	# adjust pin joint attributes
	rope.bias = 0.3
	rope.damping = 1.0
	rope.impulse_clamp = 0.01
	
	var ok = rope.can_make()
	if ok:
		add_child(rope)
		rope.make()

Rope Making Fails

Due to dynamic generating, there are many situations that rope.make() can raise errors

• The rope_length is shorter then distance between two Node3Ds
• resolution cannot be less then one
• The size of segment is longer than the rope
• Two global positions of Node3D and the turning point position cannot constitude to a triangle, as shown in the figure below

If you want to make gameplays that allows player to create rope on the fly, make sure to check the boolean result of rope.make() or rope.can_make()

Without Physics

If you do not need physics, you can simply instantiate a RopeMesh and operate the curve points of the child Path3D

RopeMesh is an ImmediateMesh that draws a 3d rope from Path3D

verlet rope C#, ImmediateMesh rope with particle verlet integration simulation, is highly recommended if you don't need RigidBody3D interaction and use C# for your project.

How it works

Dynamic 3D Physical Rope in Godot