Preliminary lasers

addons/laser/laser.gd

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+extends Node3D
+
+
+@onready var laserRay = $Laser
+@onready var beamSegment = load("res://addons/laser/laser_beam.tscn")
+@onready var laser = load("res://addons/laser/laser.tscn")
+const laserLength = 100
+const laserDensity = 1.5
+const reflectLayer = 2
+
+var points = []
+var splits = []
+
+var truePos = null
+var trueRot = null
+
+signal openDoor(door)
+
+#since raycast moves all around, this funciton returns it to the starting location
+#starting location and rotation should be changed to change the permanent place of the laser
+#do not try to change the rotation or position of the parent Node3D to change the starting point
+#and trajectory of the laser. Please use truePos and trueRot
+func positions(): 
+	laserRay.global_position = truePos
+	laserRay.target_position = trueRot
+
+
+func _ready():
+	laserRay.target_position = laserRay.target_position*laserLength
+	truePos = laserRay.global_position
+	trueRot = laserRay.target_position*laserLength
+
+
+var reflectTarget = null
+func _process(delta):
+
+	points = [laserRay.global_position] #cleans the list of places the laser goes
+	while true:
+		
+		laserRay.force_raycast_update()
+		if laserRay.is_colliding(): #check if laser in current trajectory is colliding with anything
+			if laserRay.get_collider().collision_layer == reflectLayer: #checks if object is reflective
+				reflect()
+			else:
+				points.append(laserRay.get_collision_point())
+				updateLaserBeam()
+				positions()
+				break
+		else: #if not colliding, it is assumed that it will go on to infinity and beyond. 
+			if reflectTarget != null:
+				if points[-1] != laserRay.global_position + (reflectTarget*laserLength):
+					points.append(laserRay.global_position + (reflectTarget*laserLength))
+			else:
+				if points[-1] != laserRay.global_position + (laserRay.target_position*laserLength):
+					points.append(laserRay.global_position + (laserRay.target_position*laserLength))
+			updateLaserBeam()
+			positions()
+			break
+
+	
+func updateLaserBeam(): #connects the points with spheres
+	for i in range(0, $Beams.get_child_count()):
+		$Beams.get_child(i).queue_free()
+	for i in range(0, len(points)-1): 
+		var line = points[i+1] - points[i]
+		var direction = (line.normalized())/laserDensity
+		var pos = points[i]
+		for j in range(0, (line/direction).x):
+			var instance = beamSegment.instantiate()
+			$Beams.add_child(instance)
+			$Beams.get_child(-1).global_position = pos
+			pos = pos + direction
+
+func reflect():
+	reflectTarget = ((laserRay.get_collision_point() - laserRay.global_position)).bounce(laserRay.get_collision_normal())
+	laserRay.global_position = laserRay.get_collision_point()
+	laserRay.target_position = reflectTarget*laserLength
+	points.append(laserRay.global_position)
+	updateLaserBeam()
+	#this whole sequence goes like this: laser hits reflective object, move start of 
+	#laser to the hit point, logs the laser's current position, aims the laser the way
+	#it should based on the bounce function, sees if it hits any reflective surface, 
+	#and repeat

addons/laser/laser.gd.uid

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+uid://cuwmjh8siacg1

addons/laser/laser.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://cdxjy1yy8tqeu"]
+
+[ext_resource type="Script" uid="uid://cuwmjh8siacg1" path="res://addons/laser/laser.gd" id="1_xyxma"]
+
+[node name="Node3D" type="Node3D"]
+script = ExtResource("1_xyxma")
+
+[node name="Laser" type="RayCast3D" parent="."]
+target_position = Vector3(1, 1, 2.08165e-12)
+collision_mask = 7
+
+[node name="Beams" type="Node3D" parent="."]
+
+[node name="Splits" type="Node3D" parent="."]

addons/laser/laser_beam.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://wfbn16mxdrtl"]
+
+[sub_resource type="SphereMesh" id="SphereMesh_nag17"]
+radius = 0.1
+height = 0.2
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_jodxn"]
+albedo_color = Color(1, 0, 0, 1)
+emission_enabled = true
+emission = Color(1, 0, 0, 1)
+
+[node name="laserBeam" type="MeshInstance3D"]
+mesh = SubResource("SphereMesh_nag17")
+surface_material_override/0 = SubResource("StandardMaterial3D_jodxn")