first commit

.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/

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://dj13im0k1ydwf"
+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/uastc_level=0
+compress/rdo_quality_loss=0.0
+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/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+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

light.tscn

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+[gd_scene format=3 uid="uid://b6opad48icrl8"]
+
+[node name="SpotLight3D" type="SpotLight3D"]
+transform = Transform3D(1, 0, 0, 0, -4.3711385e-08, 0.99999994, 0, -0.99999994, -4.3711385e-08, 0, 0, 0)
+light_size = 0.3
+spot_range = 0.8
+spot_attenuation = 0.0
+spot_angle = 70.0
+spot_angle_attenuation = 3.2490098

lights.gd

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+extends Marker3D
+class_name Lights
+
+@export var light_count: int = 1
+@export var light_radius: float = 5.0
+@export var light_template: PackedScene
+@export var pattern_repetition: int = 5
+
+@export var light_color: Color = Color.WHITE
+@export var light_intensity: float = 1.0
+@export var expected_rotation_delta: float = 0.
+
+func _ready() -> void:
+	for i in light_count:
+		var angle = (TAU / light_count) * i
+		var x = light_radius * cos(angle)
+		var z = light_radius * sin(angle)
+		var light_instance = light_template.instantiate()
+		light_instance.position = Vector3(x, 0, z)
+		add_child(light_instance)
+
+const BASE_DELTA: float = 16
+
+var virtual_rotation: float = 0.0
+
+const FULL_DARK_ROTATION_DELTA := .1
+
+func _process(delta: float) -> void:
+	var frames_elapsed = delta / BASE_DELTA
+	virtual_rotation += expected_rotation_delta
+	var max_darkness = expected_rotation_delta / FULL_DARK_ROTATION_DELTA
+	var i := 0
+	for light in get_children():
+		if light is SpotLight3D:
+			var pattern_offset := ((i + int(virtual_rotation * pattern_repetition)) % pattern_repetition) / float(pattern_repetition)
+			light.light_color = light_color
+			light.light_energy = 1 - (1 - pattern_offset) * max_darkness
+		i += 1
+	expected_rotation_delta = lerp(expected_rotation_delta, 0.0, frames_elapsed * 5)

lights.gd.uid

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+uid://cjmoj5kmiquip

main.gd

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+extends Node3D
+
+@onready var lights: Lights = %Lights
+@onready var slider: HSlider = %HSlider
+@onready var plane: MeshInstance3D = %Plane
+
+@export var light_rotation: float = 0.0
+@export var color_gradient: Gradient
+
+func _ready():
+	slider.value_changed.connect(set_light_rotation)
+
+var error_correction := 0.
+
+func set_light_rotation(value: float) -> void:
+	value = wrapf(value, 0, 1)
+
+	# get shortest diff including wrapping
+	var diff = light_rotation - value
+	var wrapped_diff = (value + 1) - light_rotation
+	if abs(wrapped_diff) < abs(diff):
+		diff = -wrapped_diff
+	wrapped_diff = (light_rotation + 1) - value
+	if abs(wrapped_diff) < abs(diff):
+		diff = wrapped_diff
+
+	# ignore small movements until a bigger one occurs or until they accumulate enough, to avoid reseting the light movement
+	# diff += error_correction
+	# if diff < .05:
+	# 	error_correction = diff
+	# 	return
+
+	lights.expected_rotation_delta = diff
+	light_rotation = value
+	lights.light_color = color_gradient.sample(value)
+	slider.value = value

main.gd.uid

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+uid://yxfetvyqh2t3

main.tscn

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+[gd_scene load_steps=10 format=3 uid="uid://bfysabo18nycq"]
+
+[ext_resource type="Script" uid="uid://yxfetvyqh2t3" path="res://main.gd" id="1_h2yge"]
+[ext_resource type="Script" uid="uid://cjmoj5kmiquip" path="res://lights.gd" id="1_ig7tw"]
+[ext_resource type="PackedScene" uid="uid://b6opad48icrl8" path="res://light.tscn" id="2_0xm2m"]
+
+[sub_resource type="Gradient" id="Gradient_h2yge"]
+offsets = PackedFloat32Array(0, 0.25, 0.5, 0.75, 1)
+colors = PackedColorArray(0.8156863, 0.38431373, 1, 1, 5.1018596e-06, 0.6902809, 0.5935051, 1, 0.31225172, 0.8011136, 0, 1, 0.5515474, 0.79056466, 1, 1, 0.8171765, 0.38458148, 1, 1)
+
+[sub_resource type="CylinderMesh" id="CylinderMesh_0xm2m"]
+top_radius = 1.0
+bottom_radius = 1.0
+height = 0.01
+cap_bottom = false
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_7dm0k"]
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_7dm0k"]
+
+[sub_resource type="Sky" id="Sky_ig7tw"]
+sky_material = SubResource("ProceduralSkyMaterial_7dm0k")
+
+[sub_resource type="Environment" id="Environment_0xm2m"]
+background_mode = 2
+sky = SubResource("Sky_ig7tw")
+
+[node name="Node3D" type="Node3D"]
+script = ExtResource("1_h2yge")
+color_gradient = SubResource("Gradient_h2yge")
+
+[node name="Plane" type="MeshInstance3D" parent="."]
+unique_name_in_owner = true
+mesh = SubResource("CylinderMesh_0xm2m")
+surface_material_override/0 = SubResource("StandardMaterial3D_7dm0k")
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("Environment_0xm2m")
+
+[node name="Camera3D" type="Camera3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.371139e-08, 1, 0, -1, -4.371139e-08, 0, 2, 0)
+
+[node name="Lights" type="Marker3D" parent="."]
+unique_name_in_owner = true
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.5, 0)
+gizmo_extents = 0.7
+script = ExtResource("1_ig7tw")
+light_count = 20
+light_radius = 0.7
+light_template = ExtResource("2_0xm2m")
+
+[node name="HSlider" type="HSlider" parent="."]
+unique_name_in_owner = true
+anchors_preset = 7
+anchor_left = 0.5
+anchor_top = 1.0
+anchor_right = 0.5
+anchor_bottom = 1.0
+offset_left = -150.0
+offset_top = -16.0
+offset_right = 150.0
+grow_horizontal = 2
+grow_vertical = 0
+max_value = 1.0
+step = 0.0

project.godot

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+; 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="ambientlightdemo"
+run/main_scene="uid://bfysabo18nycq"
+config/features=PackedStringArray("4.5", "Forward Plus")
+config/icon="res://icon.svg"