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godot/Camera3D.gd

@@ -0,0 +1,19 @@
+extends Camera3D
+
+var velocity: Vector3
+var acceleration: Vector3
+var g : float = 0.1
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	acceleration = -global_position.normalized()
+	velocity = Vector3(0.05, 0, 0)
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	acceleration = -global_position.normalized() * g / global_position.length_squared()
+	velocity += acceleration
+	global_translate(velocity)
+	look_at(Vector3(0,0,0))
+

godot/PlanetData.gd

@@ -0,0 +1,58 @@
+@tool
+
+extends Resource
+
+class_name PlanetData
+
+@export var radius : float = 1:
+	get:
+		return radius
+	set(value):
+		radius = value
+		emit_signal("changed")
+
+@export var resolution : int = 50:
+	get:
+		return resolution
+	set(value):
+		resolution = value
+		emit_signal("changed")
+
+@export var noise_map : FastNoiseLite = FastNoiseLite.new():
+	get:
+		return noise_map
+	set(value):
+		noise_map = value
+		emit_signal("changed")
+		if noise_map != null and not noise_map.is_connected("changed", on_data_changed):
+			noise_map.connect("changed", on_data_changed)
+
+@export var amplitude : float = 1.0:
+	get:
+		return amplitude
+	set(value):
+		amplitude = value
+		emit_signal("changed")
+
+@export var min_height : float = 0.9:
+	get:
+		return min_height
+	set(value):
+		min_height = value
+		emit_signal("changed")
+
+@export var flatness : float = 6:
+	get:
+		return flatness
+	set(value):
+		flatness = value
+		emit_signal("changed")
+
+func on_data_changed():
+	emit_signal("changed")
+
+func point_on_planet(point_on_sphere : Vector3) -> Vector3:
+	assert(noise_map != null, "Noise map not set")
+	var elevation = 1 / (1 + exp(noise_map.get_noise_3dv(point_on_sphere) * -flatness))
+	elevation = max(0.0, (elevation + 1)/2 - min_height)
+	return point_on_sphere * radius * (elevation + 1)

godot/PlanetGeneration.gd

@@ -1,8 +1,24 @@
+@tool
+
 extends Node3D
 
+@export var planet_data : Resource = PlanetData.new():
+	get:
+		return planet_data
+	set(value):
+		planet_data = value
+		on_data_changed()
+		if planet_data != null and not planet_data.is_connected("changed", on_data_changed):
+			planet_data.connect("changed", on_data_changed)
+
 func _ready():
-	pass # Replace with function body.
+	planet_data = PlanetData.new()
+	planet_data.noise_map = FastNoiseLite.new()
+	planet_data.noise_map.set_noise_type(FastNoiseLite.NoiseType.TYPE_SIMPLEX)
+	planet_data.noise_map.frequency = 1
+	on_data_changed()
 
-
-func _process(delta):
-	pass
+func on_data_changed():
+	for child in get_children():
+		var face := child as PlantetMeshFace
+		face.regenerate_mesh(planet_data)

godot/PlanetGeneration.tres

@@ -0,0 +1,4 @@
+[gd_resource type="StandardMaterial3D" format=3 uid="uid://bdomu4talxrt8"]
+
+[resource]
+albedo_color = Color(0.0666667, 0.313726, 1, 1)

godot/PlanetMeshFace.gd

@@ -1,8 +1,11 @@
+@tool
+
 extends MeshInstance3D
+class_name PlantetMeshFace
 
 @export var normal : Vector3
 
-func regenerate_mesh():
+func regenerate_mesh(planet_data):
 	var arrays := []
 	arrays.resize(Mesh.ARRAY_MAX)
 	
@@ -12,7 +15,7 @@ func regenerate_mesh():
 	
 	var index_array := PackedInt32Array()
 	
-	var resolution := 5
+	var resolution : int = planet_data.resolution
 	var num_vertices : int = resolution * resolution
 	var num_indices : int = (resolution-1) * (resolution-1) * 6
 	
@@ -22,14 +25,16 @@ func regenerate_mesh():
 	index_array.resize(num_indices)
 	
 	var tri_index : int = 0
-	var a_axis := Vector3(normal.y, normal.z, normal.z)
+	var a_axis := Vector3(normal.y, normal.z, normal.x)
 	var b_axis : Vector3 = normal.cross(a_axis)
 	for y in range(resolution):
 		for x in range(resolution):
 			var i : int = x + y*resolution
 			var percent := Vector2(x,y) / (resolution-1)
 			var point_on_cube : Vector3 = normal + (percent.x - 0.5)*2.0*a_axis + (percent.y - 0.5)*2.0*b_axis
-			vertex_array[i] = point_on_cube
+			var point_on_sphere = point_on_cube.normalized()
+			var point_on_planet = planet_data.point_on_planet(point_on_sphere)
+			vertex_array[i] = point_on_planet
 			if x != resolution-1 and y != resolution-1:
 				index_array[tri_index + 2] = i
 				index_array[tri_index + 1] = i+resolution+1
@@ -40,3 +45,33 @@ func regenerate_mesh():
 				index_array[tri_index + 3] = i+resolution+1
 				tri_index += 6
 	
+	for a in range(0, index_array.size(), 3):
+		var b : int = a + 1
+		var c : int = a + 2
+
+		var ab : Vector3 = vertex_array[index_array[b]] - vertex_array[index_array[a]]
+		var bc : Vector3 = vertex_array[index_array[c]] - vertex_array[index_array[b]]
+		var ca : Vector3 = vertex_array[index_array[a]] - vertex_array[index_array[c]]
+		
+		var cross_ab_bc : Vector3 = bc.cross(ab)
+		var cross_bc_ca : Vector3 = ca.cross(bc)
+		var cross_ca_ab : Vector3 = ab.cross(ca)
+
+		normal_array[index_array[a]] += cross_ab_bc + cross_bc_ca + cross_ca_ab
+		normal_array[index_array[b]] += cross_ab_bc + cross_bc_ca + cross_ca_ab
+		normal_array[index_array[c]] += cross_ab_bc + cross_bc_ca + cross_ca_ab
+
+	for i in range(normal_array.size()):
+		normal_array[i] = normal_array[i].normalized()
+
+	arrays[Mesh.ARRAY_VERTEX] = vertex_array
+	arrays[Mesh.ARRAY_NORMAL] = normal_array
+	arrays[Mesh.ARRAY_TEX_UV] = uv_array
+	arrays[Mesh.ARRAY_INDEX] = index_array
+
+	call_deferred("_update_mesh", arrays)
+
+func _update_mesh(arrays : Array):
+	var _mesh := ArrayMesh.new()
+	_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
+	self.mesh = _mesh

godot/PlanetShading.gdshader

@@ -0,0 +1,14 @@
+shader_type spatial;
+
+void vertex() {
+	// Called for every vertex the material is visible on.
+}
+
+void fragment() {
+	// Called for every pixel the material is visible on.
+}
+
+//void light() {
+	// Called for every pixel for every light affecting the material.
+	// Uncomment to replace the default light processing function with this one.
+//}

godot/cc71d02a-1e5a-4aa3-a8f2-44f262a17d38_scaled.jpg.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://osf4dpcksyxa"
+path.s3tc="res://.godot/imported/cc71d02a-1e5a-4aa3-a8f2-44f262a17d38_scaled.jpg-ebbed559ba54c70322c2c7ab480ed1c2.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://cc71d02a-1e5a-4aa3-a8f2-44f262a17d38_scaled.jpg"
+dest_files=["res://.godot/imported/cc71d02a-1e5a-4aa3-a8f2-44f262a17d38_scaled.jpg-ebbed559ba54c70322c2c7ab480ed1c2.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

godot/main.tscn

@@ -0,0 +1,52 @@
+[gd_scene load_steps=10 format=3 uid="uid://b4ssaqxtmkfpq"]
+
+[ext_resource type="PackedScene" uid="uid://clkrjexk1mje0" path="res://PlanetGeneration.tscn" id="1_65in3"]
+[ext_resource type="Texture2D" uid="uid://osf4dpcksyxa" path="res://cc71d02a-1e5a-4aa3-a8f2-44f262a17d38_scaled.jpg" id="1_vooe1"]
+[ext_resource type="Script" path="res://Camera3D.gd" id="2_4ip6j"]
+[ext_resource type="Script" path="res://PlanetData.gd" id="2_gy4ke"]
+
+[sub_resource type="PanoramaSkyMaterial" id="PanoramaSkyMaterial_vl6wy"]
+panorama = ExtResource("1_vooe1")
+
+[sub_resource type="Sky" id="Sky_78gnh"]
+sky_material = SubResource("PanoramaSkyMaterial_vl6wy")
+
+[sub_resource type="Environment" id="Environment_qj44i"]
+background_mode = 2
+background_energy_multiplier = 0.68
+sky = SubResource("Sky_78gnh")
+ambient_light_color = Color(0.14902, 0.14902, 0.14902, 1)
+ambient_light_sky_contribution = 0.75
+ambient_light_energy = 2.59
+tonemap_mode = 2
+glow_enabled = true
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_huf6x"]
+noise_type = 0
+frequency = 1.0
+fractal_octaves = 10
+
+[sub_resource type="Resource" id="Resource_aso5l"]
+script = ExtResource("2_gy4ke")
+radius = 1.0
+resolution = 100
+noise_map = SubResource("FastNoiseLite_huf6x")
+amplitude = 1.0
+min_height = 0.9
+flatness = 6.0
+
+[node name="Main" type="Node3D"]
+
+[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
+transform = Transform3D(0.408033, 0.826428, 0.387978, 0.660572, -0.560588, 0.499385, 0.630202, 0.0525216, -0.774653, 5.16053, 224.499, -333.943)
+shadow_enabled = true
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("Environment_qj44i")
+
+[node name="Camera3D" type="Camera3D" parent="."]
+transform = Transform3D(-1, 0, -8.74228e-08, 0, 1, 0, 8.74228e-08, 0, -1, 0, 0, -13.8584)
+script = ExtResource("2_4ip6j")
+
+[node name="Planet" parent="." instance=ExtResource("1_65in3")]
+planet_data = SubResource("Resource_aso5l")