Initial commit

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line  = lf
+indent_size  = 4
+indent_style = tab
+trim_trailing_whitespace = true
+insert_final_newline     = true

.gitattributes

@@ -0,0 +1,2 @@
+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

@@ -0,0 +1,6 @@
+# Godot 4+ specific ignores
+/.godot/
+/export_presets.cfg
+
+# Blender specifc ignores
+*.blend?

CameraController.cs

@@ -0,0 +1,14 @@
+public partial class CameraController : Node3D
+{
+	private Vector3 Offset;
+	public override void _Ready()
+	{
+		Offset = Position;
+	}
+
+	public override void _Process(double delta)
+	{
+		var target = GetParent<Node3D>().GlobalPosition + Offset;
+		GlobalPosition = GlobalPosition.Lerp(target, 1 - Pow(0.05f, (float)delta));
+	}
+}

GlobalUsings.cs

@@ -0,0 +1,7 @@
+global using System;
+global using System.Collections.Generic;
+global using System.Linq;
+
+global using Godot;
+
+global using static Godot.Mathf;

MovementController.cs

@@ -0,0 +1,80 @@
+public partial class MovementController : Node
+{
+	[ExportGroup("Movement")]
+	[Export] public float Acceleration     { get; set; } = 2.5f;
+	[Export] public float MaxSpeed         { get; set; } = 3.0f;
+	[Export] public float FrictionFloor    { get; set; } = 3.5f;
+	[Export] public float FrictionAir      { get; set; } = 1.0f;
+	[Export] public float SprintMultiplier { get; set; } = 2.0f;
+
+	[ExportGroup("Jumping")]
+	[Export] public float JumpVelocity { get; set; } = 4.0f;
+	/// <summary> Time (in seconds) after pressing the jump button a jump may occur late. </summary>
+	[Export] public float JumpEarlyTime { get; set; } = 0.2f;
+	/// <summary> Time (in seconds) after leaving a jumpable surface when a jump may still occur. </summary>
+	[Export] public float JumpCoyoteTime { get; set; } = 0.2f;
+
+	public float TimeSinceJumpPressed { get; private set; } = float.PositiveInfinity;
+	public float TimeSinceOnFloor     { get; private set; } = float.PositiveInfinity;
+
+	private CharacterBody3D Player;
+	public override void _Ready()
+	{
+		Player = GetParent<CharacterBody3D>();
+	}
+
+	public override void _UnhandledInput(InputEvent ev)
+	{
+		if (ev.IsActionPressed("move_jump")) {
+			TimeSinceJumpPressed = 0.0f;
+			GetViewport().SetInputAsHandled();
+		}
+	}
+
+	public override void _PhysicsProcess(double delta)
+	{
+		var velocity    = Player.Velocity;
+		var horVelocity = new Vector2(velocity.X, velocity.Z);
+
+		var gravity = (float)ProjectSettings.GetSetting("physics/3d/default_gravity");
+		velocity.Y -= gravity * (float)delta;
+
+		var input  = Input.GetVector("move_left", "move_right", "move_forward", "move_back");
+		var camera = GetViewport().GetCamera3D();
+		var target = input.Rotated(camera.GlobalRotation.Y - Tau / 4) * MaxSpeed;
+
+		var isOnFloor   = Player.IsOnFloor();
+		var isMoving    = target.Dot(horVelocity) > 0.0f;
+		var isSprinting = Input.IsActionPressed("move_sprint");
+
+		var accel = isMoving  ? Acceleration
+		          : isOnFloor ? FrictionFloor
+		                      : FrictionAir;
+
+		if (isSprinting) {
+			target *= SprintMultiplier;
+			accel  *= SprintMultiplier;
+		}
+
+		horVelocity = horVelocity.Lerp(target, accel * (float)delta);
+
+		velocity.X = horVelocity.X;
+		velocity.Z = horVelocity.Y;
+
+		if (isOnFloor) TimeSinceOnFloor = 0.0f;
+		else           TimeSinceOnFloor += (float)delta;
+
+		if ((TimeSinceJumpPressed <= JumpEarlyTime) && (TimeSinceOnFloor <= JumpCoyoteTime)) {
+			TimeSinceJumpPressed = TimeSinceOnFloor = float.PositiveInfinity;
+			velocity.Y = JumpVelocity;
+		} else
+			TimeSinceJumpPressed += (float)delta;
+
+		Player.Velocity = velocity;
+		Player.MoveAndSlide();
+	}
+
+	public override void _Process(double delta)
+	{
+	}
+}

PhysicsLayer.cs

@@ -0,0 +1,5 @@
+public enum PhysicsLayer
+{
+	Terrain = 0b0000_0001,
+	Objects = 0b0000_0010,
+}

SlimeDream.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Godot.NET.Sdk/4.3.0">
+  <PropertyGroup>
+    <LangVersion>12</LangVersion>
+    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework Condition=" '$(GodotTargetPlatform)' == 'android' ">net7.0</TargetFramework>
+    <TargetFramework Condition=" '$(GodotTargetPlatform)' == 'ios' ">net8.0</TargetFramework>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+  </PropertyGroup>
+</Project>

SlimeDream.sln

@@ -0,0 +1,19 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SlimeDream", "SlimeDream.csproj", "{846099AA-EFA7-4879-9BB2-0DBF0A826187}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+	Debug|Any CPU = Debug|Any CPU
+	ExportDebug|Any CPU = ExportDebug|Any CPU
+	ExportRelease|Any CPU = ExportRelease|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.ExportDebug|Any CPU.ActiveCfg = ExportDebug|Any CPU
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
+		{846099AA-EFA7-4879-9BB2-0DBF0A826187}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
+	EndGlobalSection
+EndGlobal

addons/terrain/TerrainPlugin.cs

@@ -0,0 +1,65 @@
+#if TOOLS
+
+
+using System.Security.Cryptography.X509Certificates;
+
+[Tool]
+public partial class TerrainPlugin
+	: EditorPlugin
+{
+	public override bool _Handles(GodotObject @object)
+		=> @object is Terrain;
+
+	public override void _EnterTree()
+	{
+		// Initialization of the plugin goes here.
+	}
+
+	public override void _ExitTree()
+	{
+		// Clean-up of the plugin goes here.
+	}
+
+	Terrain _previousTerrain = null;
+	public override int _Forward3DGuiInput(Camera3D viewportCamera, InputEvent @event)
+	{
+		if (@event is not InputEventMouse) return (int)AfterGuiInput.Pass;
+
+		if (!IsInstanceValid(_previousTerrain))
+			_previousTerrain = null;
+
+		if (RayCastTerrain(viewportCamera) is var (terrain, pos, normal, shape)) {
+			if (_previousTerrain != terrain) {
+				_previousTerrain?._MouseExit();
+				terrain._MouseEnter();
+				_previousTerrain = terrain;
+			}
+			terrain._InputEvent(viewportCamera, @event, pos, normal, shape);
+			return viewportCamera.GetViewport().IsInputHandled()
+				? (int)AfterGuiInput.Stop : (int)AfterGuiInput.Pass;
+		} else {
+			_previousTerrain?._MouseExit();
+			_previousTerrain = null;
+			return (int)AfterGuiInput.Pass;
+		}
+	}
+
+	(Terrain Terrain, Vector3 Position, Vector3 Normal, int Shape)? RayCastTerrain(Camera3D camera)
+	{
+		var viewport = camera.GetViewport();
+		var mouse    = viewport.GetMousePosition();
+		if (!viewport.GetVisibleRect().HasPoint(mouse)) return null;
+
+		var from = camera.ProjectRayOrigin(mouse);
+		var to   = from + camera.ProjectRayNormal(mouse) * camera.Far;
+
+		var space  = camera.GetWorld3D().DirectSpaceState;
+		var query  = new PhysicsRayQueryParameters3D { From = from, To = to };
+		var result = space.IntersectRay(query);
+		if (result.Count == 0) return null;
+
+		if ((GodotObject)result["collider"] is not Terrain terrain) return null;
+		return (terrain, (Vector3)result["position"], (Vector3)result["normal"], (int)result["shape"]);
+	}
+}
+#endif

addons/terrain/plugin.cfg

@@ -0,0 +1,7 @@
+[plugin]
+
+name="Terrain Plugin"
+description=""
+author="copygirl"
+version=""
+script="TerrainPlugin.cs"

assets/icon.svg

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assets/icon.svg.import

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+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

assets/models/terrain.blend.import

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+import_script/path=""
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assets/models/trees/tree_cone.glb.import

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assets/models/trees/tree_default.glb.import

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assets/models/trees/tree_oak.glb.import

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assets/textures/terrain/dirt.png.import

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assets/textures/terrain/grass.png.import

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assets/textures/terrain/rock.png.import

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assets/textures/terrain/sand.png.import

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character.tscn

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+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.2, 0)
+shape = SubResource("SphereShape3D_6qbb2")
+
+[node name="MovementController" type="Node" parent="."]
+script = ExtResource("1_akh08")

objects/tree_oak_cone.tscn

@@ -0,0 +1,19 @@
+[gd_scene load_steps=3 format=3 uid="uid://b65o2rhp8qx74"]
+
+[ext_resource type="PackedScene" uid="uid://sul6hrbcaal3" path="res://assets/models/trees/tree_cone.glb" id="1_8soi2"]
+
+[sub_resource type="CylinderShape3D" id="CylinderShape3D_82bei"]
+radius = 0.25
+
+[node name="TreeOakCone" type="Node3D"]
+
+[node name="tree_cone2" parent="." instance=ExtResource("1_8soi2")]
+transform = Transform3D(4, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0)
+
+[node name="StaticBody3D" type="StaticBody3D" parent="."]
+collision_layer = 2
+collision_mask = 0
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="StaticBody3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0)
+shape = SubResource("CylinderShape3D_82bei")

objects/tree_oak_round.tscn

@@ -0,0 +1,19 @@
+[gd_scene load_steps=3 format=3 uid="uid://c732i0mrp6klk"]
+
+[ext_resource type="PackedScene" uid="uid://b0578fhc4t22h" path="res://assets/models/trees/tree_oak.glb" id="1_aojgv"]
+
+[sub_resource type="CylinderShape3D" id="CylinderShape3D_causx"]
+radius = 0.35
+
+[node name="TreeOakRound" type="Node3D"]
+
+[node name="tree_oak2" parent="." instance=ExtResource("1_aojgv")]
+transform = Transform3D(4, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0.171265, 0)
+
+[node name="StaticBody3D" type="StaticBody3D" parent="."]
+collision_layer = 2
+collision_mask = 0
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="StaticBody3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0)
+shape = SubResource("CylinderShape3D_causx")

objects/tree_oak_tall.tscn

@@ -0,0 +1,21 @@
+[gd_scene load_steps=3 format=3 uid="uid://2giwj61d3h66"]
+
+[ext_resource type="PackedScene" uid="uid://c02oimc3fcl4v" path="res://assets/models/trees/tree_default.glb" id="1_frbcr"]
+
+[sub_resource type="CylinderShape3D" id="CylinderShape3D_0l3l4"]
+height = 4.0
+radius = 0.3
+
+[node name="TreeOakTall" type="Node3D"]
+
+[node name="tree_default2" parent="." instance=ExtResource("1_frbcr")]
+transform = Transform3D(4, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0)
+
+[node name="StaticBody3D" type="StaticBody3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0)
+collision_layer = 2
+collision_mask = 0
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="StaticBody3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0)
+shape = SubResource("CylinderShape3D_0l3l4")

project.godot

@@ -0,0 +1,66 @@
+; 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="SlimeDream"
+run/main_scene="res://level.tscn"
+config/features=PackedStringArray("4.3", "C#", "GL Compatibility")
+config/icon="res://assets/icon.svg"
+
+[dotnet]
+
+project/assembly_name="SlimeDream"
+
+[editor_plugins]
+
+enabled=PackedStringArray("res://addons/terrain/plugin.cfg")
+
+[input]
+
+move_left={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
+]
+}
+move_right={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"location":0,"echo":false,"script":null)
+]
+}
+move_forward={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"location":0,"echo":false,"script":null)
+]
+}
+move_back={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
+]
+}
+move_sprint={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194325,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+move_jump={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":32,"key_label":0,"unicode":32,"location":0,"echo":false,"script":null)
+]
+}
+
+[layer_names]
+
+3d_physics/layer_1="Terrain"
+3d_physics/layer_2="Objects"
+
+[rendering]
+
+renderer/rendering_method="mobile"

terrain/Terrain.cs

@@ -0,0 +1,226 @@
+[Tool]
+public partial class Terrain
+	: StaticBody3D
+{
+	[Export] public Vector2I Size { get; set; } = new(64, 64);
+	[Export] public float TileSize { get; set; } = 2.0f;
+
+	[Export] public Godot.Collections.Array<Texture2D> Textures { get; set; }
+
+	public bool IsEditing { get; } = Engine.IsEditorHint();
+
+	Vector2I? _gridHover = null;
+	Vector2I? _gridSelectionStart = null;
+	Vector2I? _gridSelectionEnd   = null;
+	bool _isSelecting = false;
+
+	Material _editToolMaterial;
+	Material _terrainMaterial;
+	public override void _Ready()
+	{
+		_editToolMaterial = new StandardMaterial3D {
+			VertexColorUseAsAlbedo = true,
+			ShadingMode   = BaseMaterial3D.ShadingModeEnum.Unshaded,
+			DepthDrawMode = BaseMaterial3D.DepthDrawModeEnum.Disabled,
+			NoDepthTest   = true,
+		};
+
+		_terrainMaterial = new StandardMaterial3D {
+			AlbedoTexture = Textures?.FirstOrDefault(),
+		};
+
+		UpdateMeshAndShape();
+	}
+
+
+	Vector2I ToGridPos(Vector3 localPos)
+		=> new(RoundToInt(localPos.X / TileSize + Size.X / 2.0f),
+		       RoundToInt(localPos.Z / TileSize + Size.Y / 2.0f));
+
+	float GetCornerHeight(Vector2I gridPos, Corner corner)
+	{
+		return 0.0f;
+	}
+
+	GridCorners GetGridCorners(Vector2I gridPos)
+	{
+		var halfSize = TileSize / 2;
+		var vx = (gridPos.X - Size.X / 2.0f) * TileSize;
+		var vz = (gridPos.Y - Size.Y / 2.0f) * TileSize;
+
+		return new() {
+			TopLeft     = new(vx - halfSize, GetCornerHeight(gridPos, Corner.TopLeft    ), vz - halfSize),
+			TopRight    = new(vx + halfSize, GetCornerHeight(gridPos, Corner.TopRight   ), vz - halfSize),
+			BottomLeft  = new(vx - halfSize, GetCornerHeight(gridPos, Corner.BottomLeft ), vz + halfSize),
+			BottomRight = new(vx + halfSize, GetCornerHeight(gridPos, Corner.BottomRight), vz + halfSize),
+		};
+	}
+
+
+	void UpdateMeshAndShape()
+	{
+		var mesh  = GetOrCreateMesh("MeshInstance");
+		var shape = GetOrCreateShape("CollisionShape");
+
+		mesh.ClearSurfaces();
+		mesh.SurfaceBegin(Mesh.PrimitiveType.Triangles);
+		var points = new List<Vector3>();
+
+		void AddPoint(Vector3 pos, Vector2 uv) {
+			mesh.SurfaceSetUV(uv);
+			mesh.SurfaceAddVertex(pos);
+			points.Add(pos);
+		}
+
+		void AddTriangle(Vector3 v1, Vector2 uv1,
+		                 Vector3 v2, Vector2 uv2,
+		                 Vector3 v3, Vector2 uv3) {
+			var dir = (v3 - v1).Cross(v2 - v1);
+			mesh.SurfaceSetNormal(dir.Normalized());
+			AddPoint(v1, uv1);
+			AddPoint(v2, uv2);
+			AddPoint(v3, uv3);
+		}
+
+		for (var x = 0; x < Size.X; x++) {
+			for (var z = 0; z < Size.Y; z++) {
+				var corners = GetGridCorners(new(x, z));
+				AddTriangle(corners.TopLeft    , new(0.0f, 0.0f),
+				            corners.TopRight   , new(1.0f, 0.0f),
+				            corners.BottomLeft , new(0.0f, 1.0f));
+				AddTriangle(corners.TopRight   , new(1.0f, 0.0f),
+				            corners.BottomRight, new(1.0f, 1.0f),
+				            corners.BottomLeft , new(0.0f, 1.0f));
+			}
+		}
+
+		mesh.SurfaceEnd();
+		mesh.SurfaceSetMaterial(0, _terrainMaterial);
+
+		shape.Data = [.. points];
+	}
+
+
+	public override void _MouseEnter()
+	{
+	}
+
+	public override void _MouseExit()
+	{
+		_gridHover = null;
+	}
+
+	public override void _InputEvent(Camera3D camera, InputEvent @event, Vector3 position, Vector3 normal, int shapeIdx)
+	{
+		if (!IsEditing) return;
+
+		var localPos = ToLocal(position);
+		var gridPos  = ToGridPos(localPos);
+
+		if (@event is InputEventMouseButton { ButtonIndex: MouseButton.Left, Pressed: var pressed }) {
+			if (pressed) _gridSelectionStart = _gridSelectionEnd = gridPos;
+			_isSelecting = pressed;
+			camera.GetViewport().SetInputAsHandled();
+		}
+
+		if (@event is InputEventMouseMotion) {
+			_gridHover = gridPos;
+			if (_isSelecting) _gridSelectionEnd = gridPos;
+		}
+	}
+
+	public override void _Process(double delta)
+	{
+		if (!IsEditing) _gridHover = _gridSelectionStart = _gridSelectionEnd = null;
+
+		if ((_gridHover != null) || (_gridSelectionStart != null)) {
+			var mesh = GetOrCreateMesh("EditToolMesh");
+			mesh.ClearSurfaces();
+			mesh.SurfaceBegin(Mesh.PrimitiveType.Lines);
+
+
+			void AddLine(Vector3 start, Vector3 end) {
+				mesh.SurfaceAddVertex(start);
+				mesh.SurfaceAddVertex(end);
+			}
+
+			void AddQuad(Vector3 topLeft, Vector3 topRight,
+			             Vector3 bottomLeft, Vector3 bottomRight) {
+				AddLine(topLeft    , topRight   );
+				AddLine(topRight   , bottomRight);
+				AddLine(bottomRight, bottomLeft );
+				AddLine(bottomLeft , topLeft    );
+			}
+
+			if (_gridHover is Vector2I hover) {
+				var corners = GetGridCorners(hover);
+				var margin  = 0.1f;
+				mesh.SurfaceSetColor(Colors.Black);
+				AddQuad(
+					corners.TopLeft     + new Vector3(-margin, 0, -margin),
+					corners.TopRight    + new Vector3(+margin, 0, -margin),
+					corners.BottomLeft  + new Vector3(-margin, 0, +margin),
+					corners.BottomRight + new Vector3(+margin, 0, +margin)
+				);
+			}
+
+			if (_gridSelectionStart is Vector2I start) {
+				var end = _gridSelectionEnd ?? start;
+				(start, end) = (new(Min(start.X, end.X), Min(start.Y, end.Y)),
+				                new(Max(start.X, end.X), Max(start.Y, end.Y)));
+				mesh.SurfaceSetColor(Colors.Blue);
+				for (var x = start.X; x <= end.X; x++)
+					for (var y = start.Y; y <= end.Y; y++) {
+						var corners = GetGridCorners(new(x, y));
+						AddQuad(corners.TopLeft, corners.TopRight, corners.BottomLeft, corners.BottomRight);
+					}
+			}
+
+			mesh.SurfaceEnd();
+			mesh.SurfaceSetMaterial(0, _editToolMaterial);
+		} else {
+			var meshInstance = (MeshInstance3D)GetNodeOrNull("EditToolMesh");
+			var mesh = (ImmediateMesh)meshInstance?.Mesh;
+			mesh?.ClearSurfaces();
+		}
+	}
+
+
+	ImmediateMesh GetOrCreateMesh(string name)
+	{
+		var meshInstance = (MeshInstance3D)GetNodeOrNull(name);
+		if (meshInstance == null) {
+			meshInstance = new() { Name = name, Mesh = new ImmediateMesh() };
+			AddChild(meshInstance);
+			meshInstance.Owner = this;
+		}
+		return (ImmediateMesh)meshInstance.Mesh;
+	}
+
+	ConcavePolygonShape3D GetOrCreateShape(string name)
+	{
+		var collisionShape = (CollisionShape3D)GetNodeOrNull(name);
+		if (collisionShape == null) {
+			collisionShape = new() { Name = name, Shape = new ConcavePolygonShape3D() };
+			AddChild(collisionShape);
+			collisionShape.Owner = this;
+		}
+		return (ConcavePolygonShape3D)collisionShape.Shape;
+	}
+
+	enum Corner
+	{
+		TopLeft,
+		TopRight,
+		BottomLeft,
+		BottomRight,
+	}
+
+	readonly struct GridCorners
+	{
+		public Vector3 TopLeft     { get; init; }
+		public Vector3 TopRight    { get; init; }
+		public Vector3 BottomLeft  { get; init; }
+		public Vector3 BottomRight { get; init; }
+	}
+}

terrain/terrain_source.tscn

@@ -0,0 +1,5 @@
+[gd_scene load_steps=2 format=3 uid="uid://b16jht8mfqr21"]
+
+[ext_resource type="PackedScene" uid="uid://buj1g5fpiuqkd" path="res://assets/models/terrain.blend" id="1_ourjj"]
+
+[node name="TerrainSource" instance=ExtResource("1_ourjj")]