Basic platformer with rope

2026-07-25 16:10:50 +12:00
commit 4818002bbd
503 changed files with 16081 additions and 0 deletions
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+extends Path3D
+# Script by Elijah Martin/Palin_drome
+@export_range(3,200,1) var number_of_segments = 10
+@export_range(3,50,1) var mesh_sides = 6
+@export var cable_thickness = 0.1
+@export_range(0.0, 0.99, 0.01) var joint_bias_or_stiffness = 0.2
+@export_range(0.0, 64.0, 0.1) var max_impulse = 2.0
+@export_range(0.0, 100.0, 0.1,"0 to disable to 100 to make completely stable") var physics_dampening = 0.5
+@export var cable_segment_mass = 2.0
+@export var fixed_start_point = true
+@export var fixed_end_point = true
+@export var rigidbody_attached_to_start : RigidBody3D
+@export var rigidbody_attached_to_end : RigidBody3D
+@export var material : Material
+@onready var mesh := $CSGPolygon3D
+@onready var distance = curve.get_baked_length()
+# instances
+var segments : Array[RigidBody3D]
+var joints : Array[PinJoint3D]
+var curve_points : Array
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	# store position and rotation
+	var rotation_buffer = rotation
+	rotation = Vector3(0,0,0)
+	var position_buffer = position
+	position = Vector3(0,0,0)
+	
+	# Duplicate the curve to ensure its unique and resets properly on reloads, avoiding drift due to re-adding the position_buffer
+	var cloned_curve = curve.duplicate()  # Duplicate curve
+	curve = cloned_curve  # Assign it as the active curve of the Path3D
+
+	# CSG Mesh shape array
+	var myShape : PackedVector2Array
+	for i in (number_of_segments+1):
+		curve_points.append(curve.sample_baked((distance*(i))/(number_of_segments), true))
+	curve.clear_points()
+
+	# create cable segments
+	for i in number_of_segments:
+		# create rigidbodies
+		segments.append(RigidBody3D.new())
+		self.add_child(segments[i])
+		# position rigidbodies between the joints
+		segments[i].position = curve_points[i] + (curve_points[i+1] - curve_points[i])/2
+		# create collision shape 3Ds
+		segments[i].add_child(CollisionShape3D.new())
+		# add capsule shape
+		segments[i].get_child(0).shape = CapsuleShape3D.new()
+		segments[i].get_child(0).shape.radius = cable_thickness
+		segments[i].get_child(0).shape.height = (curve_points[i+1]-curve_points[i]).length()
+		# small offset added to prevent Vector UP
+		segments[i].look_at_from_position(curve_points[i] + (curve_points[i+1] - curve_points[i])/2 + Vector3(0.001, 0, -0.001), curve_points[i+1])
+		segments[i].rotation.x += PI/2
+		segments[i].linear_damp = physics_dampening
+		segments[i].mass = cable_segment_mass
+		# create pin joints
+		# attach joints to rigidbodies path
+		if i == 0 && fixed_start_point:
+			#joints.append(ConeTwistJoint3D.new())
+			joints.append(PinJoint3D.new())
+			self.add_child(joints[i])
+			joints[i].position = curve_points[i]
+			joints[i].set_param(PinJoint3D.PARAM_BIAS, joint_bias_or_stiffness)
+			joints[i].set_param(PinJoint3D.PARAM_IMPULSE_CLAMP, max_impulse)
+		else:
+			#joints.append(ConeTwistJoint3D.new())
+			joints.append(PinJoint3D.new())
+			self.add_child(joints[i])
+			joints[i].position = curve_points[i]
+			joints[i].node_a = segments[i-1].get_path()
+			joints[i].node_b = segments[i].get_path()
+		#add new curve points
+		curve.add_point(curve_points[i])
+	curve.add_point(curve_points[number_of_segments])
+	# setup mesh array
+	for i in mesh_sides:
+		myShape.append(Vector2(sin(2*PI*(i+1)/mesh_sides), cos(2*PI*(i+1)/mesh_sides)) * cable_thickness)
+	
+	# setup mesh
+	mesh.polygon = myShape
+	if material != null:
+		mesh.material = material
+	
+	# restore position and rotation
+	rotation = rotation_buffer
+	# lock joints and segments position and rotation 
+	for segment in segments:
+		segment.top_level = true
+		segment.position += position_buffer
+	for joint in joints:
+		joint.top_level = true
+		joint.position += position_buffer
+	
+	# set rotation and position to 0
+	# fix start point
+	rotation = Vector3(0,0,0)
+	if fixed_start_point:
+		joints[0].node_b = segments[0].get_path()
+	if fixed_end_point:
+		#joints.append(ConeTwistJoint3D.new())
+		joints.append(PinJoint3D.new())
+		self.add_child(joints[-1])
+		joints[-1].position = curve_points[-1] + position_buffer
+		joints[-1].node_a = segments[number_of_segments - 1].get_path()
+	# attach rigid bodies if they exist
+	if rigidbody_attached_to_start != null:
+		joints[0].node_b = rigidbody_attached_to_start.get_path()
+	if rigidbody_attached_to_end != null:
+		if fixed_end_point == false:
+			joints.append(PinJoint3D.new())
+			self.add_child(joints[-1])
+			joints[-1].position = curve_points[-1] + position_buffer
+			joints[-1].node_a = segments[-1].get_path()
+		joints[-1].node_b = rigidbody_attached_to_end.get_path()
+
+
+func _physics_process(_delta: float) -> void:
+	# update curve positions
+	for p in (curve.point_count):
+		if  p < (number_of_segments):
+			# get the first segment and subtract it's basis * distance to point at the endpoint 
+			curve.set_point_position(p, segments[p].position + segments[p].transform.basis.y * segments[p].get_child(0).shape.height/2)
+		else:
+			# get the last segment and add it's basis * distance to point at the endpoint 
+			curve.set_point_position(p, segments[p-1].position - segments[p-1].transform.basis.y * segments[p-1].get_child(0).shape.height/2)
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