Portals work omg

.editorconfig

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+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/

addons/freecam_3D/freecam.gd

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+extends Camera3D
+
+## Camera with flying script attached to it.
+class_name Freecam3D
+
+##
+## Camera with toggleable freecam mode for prototyping when creating levels, shaders, lighting, etc.
+##
+## Usage: Run your game, press <TAB> and fly around freely. Uses Minecraft-like controls.
+##
+
+## Customize your own toggle key to avoid collisions with your current mappings.
+@export var toggle_key: Key = KEY_TAB
+## Speed up / down by scrolling the mouse whell down / up
+@export var invert_speed_controls: bool = false
+
+@export var overlay_text: bool = true
+
+## Pivot node for camera looking around
+@onready var pivot := Node3D.new()
+## Main parent for camera overlay.
+@onready var screen_overlay := VBoxContainer.new()
+## Container for the chat-like event log.
+@onready var event_log := VBoxContainer.new()
+
+const MAX_SPEED := 4
+const MIN_SPEED := 0.1
+const ACCELERATION := 0.1
+const MOUSE_SENSITIVITY := 0.002
+
+## Whether or not the camera can move.
+var movement_active := false:
+	set(val):
+		movement_active = val
+		Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED if movement_active else Input.MOUSE_MODE_VISIBLE)
+		display_message("[Movement ON]" if movement_active else "[Movement OFF]")
+
+## The current maximum speed. Lower or higher it by scrolling the mouse wheel.
+var target_speed := MIN_SPEED
+## Movement velocity.
+var velocity := Vector3.ZERO
+
+
+## Sets up pivot and UI overlay elements.
+func _setup_nodes() -> void:
+	self.add_sibling(pivot)
+	pivot.position = position
+	pivot.rotation = rotation
+	pivot.name = "FreecamPivot"
+	self.reparent(pivot)
+	self.position = Vector3.ZERO
+	self.rotation = Vector3.ZERO
+	# UI stuff
+	screen_overlay.add_theme_constant_override("Separation", 8)
+	self.add_child(screen_overlay)
+	screen_overlay.add_child(_make_label("Debug Camera"))
+	screen_overlay.add_spacer(false)
+	
+	screen_overlay.add_child(event_log)
+	screen_overlay.visible = overlay_text
+
+
+func _ready() -> void:
+	_setup_nodes.call_deferred()
+	_add_keybindings()
+
+
+func _process(delta: float) -> void:
+	
+	if Input.is_action_just_released("__debug_camera_toggle"):
+		movement_active = not movement_active
+	
+	if movement_active:
+		var dir = Vector3.ZERO
+		if Input.is_action_pressed("__debug_camera_forward"): 	dir.z -= 1
+		if Input.is_action_pressed("__debug_camera_back"): 		dir.z += 1
+		if Input.is_action_pressed("__debug_camera_left"): 		dir.x -= 1
+		if Input.is_action_pressed("__debug_camera_right"): 	dir.x += 1
+		if Input.is_action_pressed("__debug_camera_up"): 		dir.y += 1
+		if Input.is_action_pressed("__debug_camera_down"): 		dir.y -= 1
+		
+		dir = dir.normalized()
+		dir = dir.rotated(Vector3.UP, pivot.rotation.y)
+		
+		velocity = lerp(velocity, dir * target_speed, ACCELERATION)
+		pivot.position += velocity
+
+
+func _input(event: InputEvent) -> void:
+	if movement_active:
+		# Turn around
+		if event is InputEventMouseMotion:
+			pivot.rotate_y(-event.relative.x * MOUSE_SENSITIVITY)
+			rotate_x(-event.relative.y * MOUSE_SENSITIVITY)
+			rotation.x = clamp(rotation.x, -PI/2, PI/2)
+		
+		var speed_up = func():
+			target_speed = clamp(target_speed + 0.15, MIN_SPEED, MAX_SPEED)
+			display_message("[Speed up] " + str(target_speed))
+			
+		var slow_down = func():
+			target_speed = clamp(target_speed - 0.15, MIN_SPEED, MAX_SPEED)
+			display_message("[Slow down] " + str(target_speed))
+		
+		# Speed up and down with the mouse wheel
+		if event is InputEventMouseButton:
+			if event.button_index == MOUSE_BUTTON_WHEEL_UP and event.pressed:
+				slow_down.call() if invert_speed_controls else speed_up.call()
+				
+			if event.button_index == MOUSE_BUTTON_WHEEL_DOWN and event.pressed:
+				speed_up.call() if invert_speed_controls else slow_down.call()
+
+
+## Pushes new message label into "chat" and removes the old ones if necessary
+func display_message(text: String) -> void:
+	while event_log.get_child_count() >= 3:
+		event_log.remove_child(event_log.get_child(0))
+	
+	event_log.add_child(_make_label(text))
+
+
+func _make_label(text: String) -> Label:
+	var l = Label.new()
+	l.text = text
+	return l
+
+
+func _add_keybindings() -> void:
+	var actions = InputMap.get_actions()
+	if "__debug_camera_forward" not in actions: _add_key_input_action("__debug_camera_forward", KEY_W)
+	if "__debug_camera_back" 	not in actions: _add_key_input_action("__debug_camera_back", KEY_S)
+	if "__debug_camera_left" 	not in actions: _add_key_input_action("__debug_camera_left", KEY_A)
+	if "__debug_camera_right" 	not in actions: _add_key_input_action("__debug_camera_right", KEY_D)
+	if "__debug_camera_up" 		not in actions: _add_key_input_action("__debug_camera_up", KEY_SPACE)
+	if "__debug_camera_down" 	not in actions: _add_key_input_action("__debug_camera_down", KEY_SHIFT)
+	if "__debug_camera_toggle" 	not in actions: _add_key_input_action("__debug_camera_toggle", toggle_key)
+
+
+func _add_key_input_action(name: String, key: Key) -> void:
+	var ev = InputEventKey.new()
+	ev.physical_keycode = key
+	
+	InputMap.add_action(name)
+	InputMap.action_add_event(name, ev)
+

addons/freecam_3D/freecam.gd.uid

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+uid://hhinqn2b35ry

addons/freecam_3D/mc-camera2.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c4kitg6s5bcqu"
+path="res://.godot/imported/mc-camera2.png-fe60f555c5ea92c0796267cd654ef834.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://addons/freecam_3D/mc-camera2.png"
+dest_files=["res://.godot/imported/mc-camera2.png-fe60f555c5ea92c0796267cd654ef834.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

addons/freecam_3D/plugin.cfg

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+[plugin]
+
+name="Freecam3D"
+description="A flying freecam with Minecraft-like controls."
+author="Vojtech Struhar"
+version="1.2.0"
+script="plugin.gd"

addons/freecam_3D/plugin.gd

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+@tool
+extends EditorPlugin
+
+##
+## Bootstraps the Freecam3D node.
+##
+
+func _enter_tree() -> void:
+	print("[Freecam3D Plugin] Loaded.")
+	
+	add_custom_type(
+			"Freecam3D", 
+			"Camera3D", 
+			preload("res://addons/freecam_3D/freecam.gd"), 
+			preload("res://addons/freecam_3D/mc-camera2.png"))
+
+
+func _exit_tree() -> void:
+	remove_custom_type("Freecam3D")
+

addons/freecam_3D/plugin.gd.uid

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+uid://bbm3kiepb07f

icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://xi6x2fcxxvt7"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

material_01.tres

@@ -0,0 +1,10 @@
+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://ghbu2w8ocp64"]
+
+[ext_resource type="Texture2D" uid="uid://s3y04hbbp0w2" path="res://texture_01.png" id="1_bp01u"]
+
+[resource]
+vertex_color_is_srgb = true
+albedo_texture = ExtResource("1_bp01u")
+uv1_triplanar = true
+uv1_world_triplanar = true
+texture_filter = 5

node_label.gd

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+@tool
+extends Label3D
+
+func _ready() -> void:
+	update_text()
+
+func update_text() -> void:
+	var p = get_parent()
+	if p:
+		self.text = p.name
+	else:
+		self.text = "No parent"

node_label.gd.uid

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+uid://fsxesq30glaw

node_label.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://ja485k5pgefb"]
+
+[ext_resource type="Script" uid="uid://fsxesq30glaw" path="res://node_label.gd" id="1_4l7rt"]
+
+[node name="NodeLabel" type="Label3D"]
+script = ExtResource("1_4l7rt")

portal_camera.gd

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+@tool
+extends Camera3D
+
+@export var home: Node3D
+@export var target: Node3D
+@export var portal_mesh: MeshInstance3D:
+	set(v):
+		portal_mesh = v
+		if v != null:
+			print("set: portal_mesh", v)
+			var mat = v.mesh.surface_get_material(0) as ShaderMaterial
+			mat.set_shader_parameter("albedo", get_parent().get_texture())
+
+@export var player_camera: Node3D
+
+@export_tool_button("Grab editor camera", "Camera3D")
+var _tb_grab_editor_camera: Callable = _grab_editor_camera
+
+
+func _ready() -> void:
+	if home == null:
+		var p = get_parent()
+		while p is not Node3D:
+			p = p.get_parent()
+		home = p
+		print(name + ": home = " + home.name)
+	
+	var env: Environment = get_world_3d().environment.duplicate()
+	env.tonemap_mode = Environment.TONE_MAPPER_LINEAR
+	env.tonemap_exposure = 1
+	self.environment = env
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	if not check():
+		return
+	
+	var player_to_home = home.global_transform.affine_inverse() * player_camera.global_transform
+	var flipped = player_to_home.rotated(Vector3.UP, PI)
+	var relative_to_target = target.global_transform * flipped
+	
+	self.global_transform = relative_to_target
+
+
+func check() -> bool:
+	return target != null and \
+		player_camera != null and \
+		home != null and \
+		portal_mesh != null
+
+func _grab_editor_camera() -> void:
+	if Engine.is_editor_hint():
+		print("Grabbing editor camera")
+		player_camera = EditorInterface.get_editor_viewport_3d(0).get_camera_3d()
+	else:
+		print("Not in editor - cannot grab editor camera!")

portal_camera.gd.uid

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+uid://dndoebk0ajyga

portal_camera.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://c3r8mu47c7pex"]
+
+[ext_resource type="Script" uid="uid://dndoebk0ajyga" path="res://portal_camera.gd" id="1_jsd0o"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_jsd0o"]
+
+[sub_resource type="PrismMesh" id="PrismMesh_llqtg"]
+material = SubResource("StandardMaterial3D_jsd0o")
+size = Vector3(1.5, 1, 0.68)
+
+[node name="PortalCamera" type="Camera3D"]
+script = ExtResource("1_jsd0o")
+
+[node name="Cone" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 0, -0.5)
+mesh = SubResource("PrismMesh_llqtg")

portal_shader.gdshader

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+/*
+    Asset: Godot Simple Portal System
+    File: portal.gdshader
+    Description: Shader used by the simple portal system.
+    Repository: https://github.com/Donitzo/godot-simple-portal-system
+    License: CC0 License
+*/
+
+shader_type spatial;
+render_mode unshaded;
+
+uniform sampler2D albedo:hint_default_black, source_color;
+
+varying float pixel_distance;
+
+void vertex() {
+    // Calculate the world-space distance between the pixel and camera.
+    // Pass the distance to the fragment shader using a varying attribute.
+    vec3 world_position = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+    vec3 camera_position = (INV_VIEW_MATRIX * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
+
+    //pixel_distance = distance(world_position, camera_position);
+}
+
+void fragment() {
+    // The portal color is simply the screen-space color of the exit camera render target.
+    // This is because the exit camera views the exit portal from the perspective of the player watching
+    // the entrance portal, meaning the exit portal will occupy the same screen-space as the entrance portal.
+    vec3 portal_color = texture(albedo, SCREEN_UV).rgb;
+
+    // Fade-out color
+    ALBEDO = portal_color;
+}

portal_shader.gdshader.uid

@@ -0,0 +1 @@
+uid://c13etsjuimkrs

portal_shader_material.tres

@@ -0,0 +1,8 @@
+[gd_resource type="ShaderMaterial" load_steps=2 format=3 uid="uid://ctb8htd1nm3an"]
+
+[ext_resource type="Shader" uid="uid://c13etsjuimkrs" path="res://portal_shader.gdshader" id="1_qfvuj"]
+
+[resource]
+resource_local_to_scene = true
+render_priority = 0
+shader = ExtResource("1_qfvuj")

project.godot

@@ -0,0 +1,24 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Test portal transformations"
+config/features=PackedStringArray("4.4", "Forward Plus")
+config/icon="res://icon.svg"
+
+[display]
+
+window/size/viewport_width=1920
+window/size/viewport_height=1080
+
+[editor_plugins]
+
+enabled=PackedStringArray("res://addons/freecam_3D/plugin.cfg")

texture_01.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://s3y04hbbp0w2"
+path.s3tc="res://.godot/imported/texture_01.png-87772d058110b5d64dbdfb8c04d0f2f5.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://texture_01.png"
+dest_files=["res://.godot/imported/texture_01.png-87772d058110b5d64dbdfb8c04d0f2f5.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

world.tscn

@@ -0,0 +1,165 @@
+[gd_scene load_steps=23 format=4 uid="uid://bjp6cbtfne2qj"]
+
+[ext_resource type="Material" uid="uid://ghbu2w8ocp64" path="res://material_01.tres" id="1_f3sb7"]
+[ext_resource type="Shader" uid="uid://c13etsjuimkrs" path="res://portal_shader.gdshader" id="2_036b0"]
+[ext_resource type="PackedScene" uid="uid://ja485k5pgefb" path="res://node_label.tscn" id="2_fj7yv"]
+[ext_resource type="PackedScene" uid="uid://c3r8mu47c7pex" path="res://portal_camera.tscn" id="3_tlwt5"]
+[ext_resource type="Script" uid="uid://hhinqn2b35ry" path="res://addons/freecam_3D/freecam.gd" id="5_036b0"]
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_036b0"]
+sky_horizon_color = Color(0.662243, 0.671743, 0.686743, 1)
+ground_horizon_color = Color(0.662243, 0.671743, 0.686743, 1)
+
+[sub_resource type="Sky" id="Sky_dwbse"]
+sky_material = SubResource("ProceduralSkyMaterial_036b0")
+
+[sub_resource type="Environment" id="Environment_pkg7o"]
+background_mode = 2
+sky = SubResource("Sky_dwbse")
+tonemap_mode = 2
+glow_enabled = true
+
+[sub_resource type="BoxMesh" id="BoxMesh_fj7yv"]
+size = Vector3(20, 1, 20)
+
+[sub_resource type="ViewportTexture" id="ViewportTexture_036b0"]
+viewport_path = NodePath("PortalA/SubViewport")
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_dwbse"]
+resource_local_to_scene = true
+render_priority = 0
+shader = ExtResource("2_036b0")
+shader_parameter/albedo = SubResource("ViewportTexture_036b0")
+
+[sub_resource type="PlaneMesh" id="PlaneMesh_pkg7o"]
+material = SubResource("ShaderMaterial_dwbse")
+size = Vector2(1.5, 2)
+orientation = 2
+
+[sub_resource type="Environment" id="Environment_dwbse"]
+background_mode = 2
+sky = SubResource("Sky_dwbse")
+glow_enabled = true
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_tlwt5"]
+_surfaces = [{
+"aabb": AABB(-1, -1.25, -0.25, 2, 2.5, 0.5),
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+"format": 34359738391,
+"primitive": 3,
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