terrain3d test

addons/terrain_3d/LICENSE.txt

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+MIT License
+
+Copyright (c) 2023 Cory Petkovsek, Roope Palmroos, and Contributors.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

addons/terrain_3d/README.md

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+<img src="doc/docs/images/terrain3d.png">
+
+# Terrain3D
+A high performance, editable terrain system for Godot 4.
+
+## Features
+* Written in C++ as a GDExtension addon, which works with official engine builds
+* Can be accessed by GDScript, C#, and any language Godot supports
+* Geometric Clipmap Mesh Terrain, as used in The Witcher 3. See [System Architecture](https://terrain3d.readthedocs.io/en/stable/docs/system_architecture.html) 
+* Up to 16k x 16k in 1k regions (imagine multiple islands without paying for 16k^2 vram)
+* Up to 32 textures
+* Up to 10 levels of detail
+* Foliage instancing
+* Sculpting, holes, texture painting, texture detiling, painting colors and wetness
+* Imports heightmaps from [HTerrain](https://github.com/Zylann/godot_heightmap_plugin/), WorldMachine, Unity, Unreal and any tool that can export a heightmap (raw/r16/exr/+). See [importing data](https://terrain3d.readthedocs.io/en/stable/docs/import_export.html)
+
+See [Project Status](https://terrain3d.readthedocs.io/en/stable/docs/project_status.html) for details.
+
+## Getting Started
+
+1. Read the [Installation & Upgrades](https://terrain3d.readthedocs.io/en/stable/docs/installation.html) instructions.
+
+2. For support, read [Getting Help](https://terrain3d.readthedocs.io/en/stable/docs/getting_help.html) or join our [Discord server](https://tokisan.com/discord).
+
+3. Watch the tutorial videos:
+
+**Installation, Setup, Basic Usage**
+
+[![Using Terrain3D - Part 1](https://i.ytimg.com/vi/oV8c9alXVwU/hqdefault.jpg)](https://youtu.be/oV8c9alXVwU)
+
+**Texture Painting, Holes, Navigation, Advanced Usage**
+
+[![Using Terrain3D - Part 2](https://i.ytimg.com/vi/YtiAI2F6Xkk/hqdefault.jpg)](https://youtu.be/YtiAI2F6Xkk)
+
+
+## Credit
+Developed for the Godot community by:
+
+|||
+|--|--|
+| **Cory Petkovsek, Tokisan Games** | [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/twitter.png?raw=true" width="24"/>](https://twitter.com/TokisanGames) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/github.png?raw=true" width="24"/>](https://github.com/TokisanGames) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/www.png?raw=true" width="24"/>](https://tokisan.com/) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/discord.png?raw=true" width="24"/>](https://tokisan.com/discord) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/youtube.png?raw=true" width="24"/>](https://www.youtube.com/@TokisanGames)|
+| **Roope Palmroos, Outobugi Games** | [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/twitter.png?raw=true" width="24"/>](https://twitter.com/outobugi) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/github.png?raw=true" width="24"/>](https://github.com/outobugi) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/www.png?raw=true" width="24"/>](https://outobugi.com/) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/youtube.png?raw=true" width="24"/>](https://www.youtube.com/@outobugi)|
+
+And other contributors displayed on the right of the github page and in [AUTHORS.md](https://github.com/TokisanGames/Terrain3D/blob/main/AUTHORS.md).
+
+Geometry clipmap mesh code created by [Mike J. Savage](https://mikejsavage.co.uk/blog/geometry-clipmaps.html). Blog and repository code released under the MIT license per email communication with Mike.
+
+## Contributing
+
+Please see [CONTRIBUTING.md](https://github.com/TokisanGames/Terrain3D/blob/main/CONTRIBUTING.md) if you would like to help make Terrain3D the best terrain system for Godot.
+
+
+## License
+
+This addon has been released under the [MIT License](https://github.com/TokisanGames/Terrain3D/blob/main/LICENSE.txt).
+

addons/terrain_3d/editor.gd

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+@tool
+extends EditorPlugin
+#class_name Terrain3DEditorPlugin Cannot be named until Godot #75388
+
+
+# Includes
+const UI: Script = preload("res://addons/terrain_3d/src/ui.gd")
+const RegionGizmo: Script = preload("res://addons/terrain_3d/src/region_gizmo.gd")
+const ASSET_DOCK: String = "res://addons/terrain_3d/src/asset_dock.tscn"
+const PS_DOCK_POSITION: String = "terrain3d/config/dock_position"
+const PS_DOCK_PINNED: String = "terrain3d/config/dock_pinned"
+
+var terrain: Terrain3D
+var _last_terrain: Terrain3D
+var nav_region: NavigationRegion3D
+
+var editor: Terrain3DEditor
+var ui: Node # Terrain3DUI see Godot #75388
+var asset_dock: PanelContainer
+var region_gizmo: RegionGizmo
+var visible: bool
+var current_region_position: Vector2
+var mouse_global_position: Vector3 = Vector3.ZERO
+
+# Track negative input (CTRL)
+var _negative_input: bool = false
+# Track state prior to pressing CTRL: -1 not tracked, 0 false, 1 true
+var _prev_enable_state: int = -1
+
+
+func _enter_tree() -> void:
+	editor = Terrain3DEditor.new()
+	ui = UI.new()
+	ui.plugin = self
+	add_child(ui)
+
+	region_gizmo = RegionGizmo.new()
+
+	scene_changed.connect(_on_scene_changed)
+
+	asset_dock = load(ASSET_DOCK).instantiate()
+	asset_dock.initialize(self)
+
+	
+func _exit_tree() -> void:
+	asset_dock.remove_dock(true)
+	asset_dock.queue_free()
+	ui.queue_free()
+	editor.free()
+
+	scene_changed.disconnect(_on_scene_changed)
+
+
+func _handles(p_object: Object) -> bool:
+	if p_object is Terrain3D:
+		return true
+	
+	# Terrain3DObjects requires access to EditorUndoRedoManager. The only way to make sure it
+	# always has it, is to pass it in here. _edit is NOT called if the node is cut and pasted.
+	if p_object is Terrain3DObjects:
+		p_object.editor_setup(self)
+	elif p_object is Node3D and p_object.get_parent() is Terrain3DObjects:
+		p_object.get_parent().editor_setup(self)
+	
+	if is_instance_valid(_last_terrain) and _last_terrain.is_inside_tree() and p_object is NavigationRegion3D:
+		return true
+	
+	return false
+
+
+func _edit(p_object: Object) -> void:
+	if !p_object:
+		_clear()
+
+	if p_object is Terrain3D:
+		if p_object == terrain:
+			return
+		terrain = p_object
+		_last_terrain = terrain
+		editor.set_terrain(terrain)
+		region_gizmo.set_node_3d(terrain)
+		terrain.add_gizmo(region_gizmo)
+		terrain.set_plugin(self)
+		
+		# Connect to new Assets resource
+		if not terrain.assets_changed.is_connected(asset_dock.update_assets):
+			terrain.assets_changed.connect(asset_dock.update_assets)
+		asset_dock.update_assets()
+		# Connect to new Storage resource
+		if not terrain.storage_changed.is_connected(_load_storage):
+			terrain.storage_changed.connect(_load_storage)
+		_load_storage()
+	else:
+		_clear()
+
+	if is_instance_valid(_last_terrain) and _last_terrain.is_inside_tree():
+		if p_object is NavigationRegion3D:
+			nav_region = p_object
+		else:
+			nav_region = null
+
+
+func _make_visible(p_visible: bool, p_redraw: bool = false) -> void:
+	visible = p_visible
+	ui.set_visible(visible)
+	update_region_grid()
+	asset_dock.update_dock(visible)
+
+
+func _clear() -> void:
+	if is_terrain_valid():
+		terrain.storage_changed.disconnect(_load_storage)
+		
+		terrain.clear_gizmos()
+		terrain = null
+		editor.set_terrain(null)
+		
+		ui.clear_picking()
+		
+	region_gizmo.clear()
+
+
+func _forward_3d_gui_input(p_viewport_camera: Camera3D, p_event: InputEvent) -> int:
+	if not is_terrain_valid():
+		return AFTER_GUI_INPUT_PASS
+	
+	## Track negative input (CTRL)
+	if p_event is InputEventKey and not p_event.echo and p_event.keycode == KEY_CTRL:
+		if p_event.is_pressed():
+			_negative_input = true
+			_prev_enable_state = int(ui.toolbar_settings.get_setting("enable"))
+			ui.toolbar_settings.set_setting("enable", false)
+		else:
+			_negative_input = false
+			ui.toolbar_settings.set_setting("enable", bool(_prev_enable_state))
+			_prev_enable_state = -1
+	
+	## Handle mouse movement
+	if p_event is InputEventMouseMotion:
+		if Input.is_mouse_button_pressed(MOUSE_BUTTON_RIGHT):
+			return AFTER_GUI_INPUT_PASS
+
+		if _prev_enable_state >= 0 and not Input.is_key_pressed(KEY_CTRL):
+			_negative_input = false
+			ui.toolbar_settings.set_setting("enable", bool(_prev_enable_state))
+			_prev_enable_state = -1
+
+		## Setup for active camera & viewport
+		
+		# Snap terrain to current camera 
+		terrain.set_camera(p_viewport_camera)
+
+		# Detect if viewport is set to half_resolution
+		# Structure is: Node3DEditorViewportContainer/Node3DEditorViewport(4)/SubViewportContainer/SubViewport/Camera3D
+		var editor_vpc: SubViewportContainer = p_viewport_camera.get_parent().get_parent()
+		var full_resolution: bool = false if editor_vpc.stretch_shrink == 2 else true
+
+		## Get mouse location on terrain
+		
+		# Project 2D mouse position to 3D position and direction
+		var mouse_pos: Vector2 = p_event.position if full_resolution else p_event.position/2
+		var camera_pos: Vector3 = p_viewport_camera.project_ray_origin(mouse_pos)
+		var camera_dir: Vector3 = p_viewport_camera.project_ray_normal(mouse_pos)
+
+		# If region tool, grab mouse position without considering height
+		if editor.get_tool() == Terrain3DEditor.REGION:
+			var t = -Vector3(0, 1, 0).dot(camera_pos) / Vector3(0, 1, 0).dot(camera_dir)
+			mouse_global_position = (camera_pos + t * camera_dir)
+		else:			
+			# Else look for intersection with terrain
+			var intersection_point: Vector3 = terrain.get_intersection(camera_pos, camera_dir)
+			if intersection_point.z > 3.4e38 or is_nan(intersection_point.z): # max double or nan
+				return AFTER_GUI_INPUT_STOP
+			mouse_global_position = intersection_point
+		
+		## Update decal
+		ui.decal.global_position = mouse_global_position
+		ui.decal.albedo_mix = 1.0
+		if ui.decal_timer.is_stopped():
+			ui.update_decal()
+		else:
+			ui.decal_timer.start()
+
+		## Update region highlight
+		var region_size = terrain.get_storage().get_region_size()
+		var region_position: Vector2 = ( Vector2(mouse_global_position.x, mouse_global_position.z) \
+			/ (region_size * terrain.get_mesh_vertex_spacing()) ).floor()
+		if current_region_position != region_position:
+			current_region_position = region_position
+			update_region_grid()
+			
+		if Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) and editor.is_operating():
+			editor.operate(mouse_global_position, p_viewport_camera.rotation.y)
+			return AFTER_GUI_INPUT_STOP
+
+	elif p_event is InputEventMouseButton:
+		ui.update_decal()
+			
+		if p_event.get_button_index() == MOUSE_BUTTON_LEFT:
+			if p_event.is_pressed():
+				if Input.is_mouse_button_pressed(MOUSE_BUTTON_RIGHT):
+					return AFTER_GUI_INPUT_STOP
+					
+				# If picking
+				if ui.is_picking():
+					ui.pick(mouse_global_position)
+					if not ui.operation_builder or not ui.operation_builder.is_ready():
+						return AFTER_GUI_INPUT_STOP
+				
+				# If adjusting regions
+				if editor.get_tool() == Terrain3DEditor.REGION:
+					# Skip regions that already exist or don't
+					var has_region: bool = terrain.get_storage().has_region(mouse_global_position)
+					var op: int = editor.get_operation()
+					if	( has_region and op == Terrain3DEditor.ADD) or \
+						( not has_region and op == Terrain3DEditor.SUBTRACT ):
+						return AFTER_GUI_INPUT_STOP
+				
+				# If an automatic operation is ready to go (e.g. gradient)
+				if ui.operation_builder and ui.operation_builder.is_ready():
+					ui.operation_builder.apply_operation(editor, mouse_global_position, p_viewport_camera.rotation.y)
+					return AFTER_GUI_INPUT_STOP
+				
+				# Mouse clicked, start editing
+				editor.start_operation(mouse_global_position)
+				editor.operate(mouse_global_position, p_viewport_camera.rotation.y)
+				return AFTER_GUI_INPUT_STOP
+			
+			elif editor.is_operating():
+				# Mouse released, save undo data
+				editor.stop_operation()
+				return AFTER_GUI_INPUT_STOP
+	
+	return AFTER_GUI_INPUT_PASS
+
+	
+func _load_storage() -> void:
+	if terrain:
+		update_region_grid()
+
+
+func update_region_grid() -> void:
+	if not region_gizmo:
+		return
+
+	region_gizmo.set_hidden(not visible)
+	
+	if is_terrain_valid():
+		region_gizmo.show_rect = editor.get_tool() == Terrain3DEditor.REGION
+		region_gizmo.use_secondary_color = editor.get_operation() == Terrain3DEditor.SUBTRACT
+		region_gizmo.region_position = current_region_position
+		region_gizmo.region_size = terrain.get_storage().get_region_size() * terrain.get_mesh_vertex_spacing()
+		region_gizmo.grid = terrain.get_storage().get_region_offsets()
+		
+		terrain.update_gizmos()
+		return
+		
+	region_gizmo.show_rect = false
+	region_gizmo.region_size = 1024
+	region_gizmo.grid = [Vector2i.ZERO]
+
+
+func _on_scene_changed(scene_root: Node) -> void:
+	if not scene_root:
+		return
+		
+	for node in scene_root.find_children("", "Terrain3DObjects"):
+		node.editor_setup(self)
+
+	asset_dock.update_assets()
+	await get_tree().create_timer(2).timeout
+	asset_dock.update_thumbnails()
+
+		
+func is_terrain_valid(p_terrain: Terrain3D = null) -> bool:
+	var t: Terrain3D
+	if p_terrain:
+		t = p_terrain
+	else:
+		t = terrain
+	if is_instance_valid(t) and t.is_inside_tree() and t.get_storage():
+		return true
+	return false
+
+
+func is_selected() -> bool:
+	var selected: Array[Node] = get_editor_interface().get_selection().get_selected_nodes()
+	for node in selected:
+		if node.get_instance_id() == _last_terrain.get_instance_id():
+			return true
+			
+	return false	
+
+
+func select_terrain() -> void:
+	if is_instance_valid(_last_terrain) and is_terrain_valid(_last_terrain) and not is_selected():
+		var es: EditorSelection = get_editor_interface().get_selection()
+		es.clear()
+		es.add_node(_last_terrain)

addons/terrain_3d/extras/import_sgt.gd

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+## Import From SimpleGrassTextured
+# 
+# This script demonstrates how to import transforms from SimpleGrassTextured. To use it:
+#
+# 1. Setup the mesh asset you wish to use in the asset dock.
+# 1. Select your Terrain3D node.
+# 1. In the inspector, click Script (very bottom) and Quick Load import_sgt.gd.
+# 1. At the very top, assign your SimpleGrassTextured node.
+# 1. Input the desired mesh asset ID.
+# 1. Click import. The output window and console will report when finished.
+# 1. Clear the script from your Terrain3D node, and save your scene. 
+#
+# The instance transforms are now stored in your Storage resource.
+#
+# Use clear_instances to erase all instances that match the assign_mesh_id.
+#
+# The add_transforms function (called by add_multimesh) applies the height_offset specified in the 
+# Terrain3DMeshAsset. 
+# Once the transforms are imported, you can reassign any mesh you like into this mesh slot.
+
+@tool
+extends Terrain3D
+
+@export var simple_grass_textured: MultiMeshInstance3D
+@export var assign_mesh_id: int
+@export var import: bool = false : set = import_sgt
+@export var clear_instances: bool = false : set = clear_multimeshes
+
+
+func clear_multimeshes(value: bool) -> void:
+	get_instancer().clear_by_mesh(assign_mesh_id)
+
+
+func import_sgt(value: bool) -> void:
+	var sgt_mm: MultiMesh = simple_grass_textured.multimesh
+	var global_xform: Transform3D = simple_grass_textured.global_transform	
+	print("Starting to import %d instances from SimpleGrassTextured using mesh id %d" % [ sgt_mm.instance_count, assign_mesh_id])
+	var time: int = Time.get_ticks_msec()
+	get_instancer().add_multimesh(assign_mesh_id, sgt_mm, simple_grass_textured.global_transform)	
+	print("Import complete in %.2f seconds" % [ float(Time.get_ticks_msec() - time)/1000. ])
+	

addons/terrain_3d/extras/minimum.gdshader

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+// This shader is the minimum needed to allow the terrain to function, without any texturing.
+
+shader_type spatial;
+render_mode blend_mix,depth_draw_opaque,cull_back,diffuse_burley,specular_schlick_ggx;
+
+// Private uniforms
+uniform float _region_size = 1024.0;
+uniform float _region_texel_size = 0.0009765625; // = 1/1024
+uniform float _mesh_vertex_spacing = 1.0;
+uniform float _mesh_vertex_density = 1.0; // = 1/_mesh_vertex_spacing
+uniform int _region_map_size = 16;
+uniform int _region_map[256];
+uniform vec2 _region_offsets[256];
+uniform sampler2DArray _height_maps : repeat_disable;
+uniform usampler2DArray _control_maps : repeat_disable;
+uniform sampler2DArray _color_maps : source_color, filter_linear_mipmap_anisotropic, repeat_disable;
+uniform sampler2DArray _texture_array_albedo : source_color, filter_linear_mipmap_anisotropic, repeat_enable;
+uniform sampler2DArray _texture_array_normal : hint_normal, filter_linear_mipmap_anisotropic, repeat_enable;
+
+uniform float _texture_uv_scale_array[32];
+uniform float _texture_uv_rotation_array[32];
+uniform vec4 _texture_color_array[32];
+uniform uint _background_mode = 1u;  // NONE = 0, FLAT = 1, NOISE = 2
+uniform uint _mouse_layer = 0x80000000u; // Layer 32
+
+varying flat vec2 v_uv_offset;
+varying flat vec2 v_uv2_offset;
+
+////////////////////////
+// Vertex
+////////////////////////
+
+// Takes in UV world space coordinates, returns ivec3 with:
+// XY: (0 to _region_size) coordinates within a region
+// Z: layer index used for texturearrays, -1 if not in a region
+ivec3 get_region_uv(vec2 uv) {
+	uv *= _region_texel_size;
+	ivec2 pos = ivec2(floor(uv)) + (_region_map_size / 2);
+	int bounds = int(pos.x>=0 && pos.x<_region_map_size && pos.y>=0 && pos.y<_region_map_size);
+	int layer_index = _region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1;
+	return ivec3(ivec2((uv - _region_offsets[layer_index]) * _region_size), layer_index);
+}
+
+// Takes in UV2 region space coordinates, returns vec3 with:
+// XY: (0 to 1) coordinates within a region
+// Z: layer index used for texturearrays, -1 if not in a region
+vec3 get_region_uv2(vec2 uv) {
+	// Vertex function added half a texel to UV2, to center the UV's.  vertex(), fragment() and get_height()
+	// call this with reclaimed versions of UV2, so to keep the last row/column within the correct
+	// window, take back the half pixel before the floor(). 
+	ivec2 pos = ivec2(floor(uv - vec2(_region_texel_size * 0.5))) + (_region_map_size / 2);
+	int bounds = int(pos.x>=0 && pos.x<_region_map_size && pos.y>=0 && pos.y<_region_map_size);
+	int layer_index = _region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1;
+	// The return value is still texel-centered.
+	return vec3(uv - _region_offsets[layer_index], float(layer_index));
+}
+
+// 1 lookup
+float get_height(vec2 uv) {
+	highp float height = 0.0;
+	vec3 region = get_region_uv2(uv);
+	if (region.z >= 0.) {
+		height = texture(_height_maps, region).r;
+	}
+ 	return height;
+}
+
+void vertex() {
+	// Get vertex of flat plane in world coordinates and set world UV
+	vec3 vertex = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+	
+	// UV coordinates in world space. Values are 0 to _region_size within regions
+	UV = round(vertex.xz * _mesh_vertex_density);
+
+	// Discard vertices for Holes. 1 lookup
+	ivec3 region = get_region_uv(UV);
+	uint control = texelFetch(_control_maps, region, 0).r;
+	bool hole = bool(control >>2u & 0x1u);
+	// Show holes to all cameras except mouse camera (on exactly 1 layer)
+	if ( !(CAMERA_VISIBLE_LAYERS == _mouse_layer) && 
+			(hole || (_background_mode == 0u && region.z < 0)) ) {
+		VERTEX.x = 0./0.;
+	} else {
+		// UV coordinates in region space + texel offset. Values are 0 to 1 within regions
+		UV2 = (UV + vec2(0.5)) * _region_texel_size;
+
+		// Get final vertex location and save it
+		VERTEX.y = get_height(UV2);
+	}
+
+	// Transform UVs to local to avoid poor precision during varying interpolation.
+	v_uv_offset = MODEL_MATRIX[3].xz * _mesh_vertex_density;
+	UV -= v_uv_offset;
+	v_uv2_offset = v_uv_offset * _region_texel_size;
+	UV2 -= v_uv2_offset;
+}
+
+////////////////////////
+// Fragment
+////////////////////////
+
+// 3 lookups
+vec3 get_normal(vec2 uv, out vec3 tangent, out vec3 binormal) {
+	// Get the height of the current vertex
+	float height = get_height(uv);
+
+	// Get the heights to the right and in front, but because of hardware 
+	// interpolation on the edges of the heightmaps, the values are off
+	// causing the normal map to look weird. So, near the edges of the map
+	// get the heights to the left or behind instead. Hacky solution that 
+	// reduces the artifact, but doesn't fix it entirely. See #185.
+	float u, v;
+	if(mod(uv.y*_region_size, _region_size) > _region_size-2.) {
+		v = get_height(uv + vec2(0, -_region_texel_size)) - height;
+	} else {
+		v = height - get_height(uv + vec2(0, _region_texel_size));
+	}
+	if(mod(uv.x*_region_size, _region_size) > _region_size-2.) {
+		u = get_height(uv + vec2(-_region_texel_size, 0)) - height;		
+	} else {
+		u = height - get_height(uv + vec2(_region_texel_size, 0));
+	}
+
+	vec3 normal = vec3(u, _mesh_vertex_spacing, v);
+	normal = normalize(normal);
+	tangent = cross(normal, vec3(0, 0, 1));
+	binormal = cross(normal, tangent);
+	return normal;
+}
+
+void fragment() {
+	// Recover UVs
+	vec2 uv = UV + v_uv_offset;
+	vec2 uv2 = UV2 + v_uv2_offset;
+
+	// Calculate Terrain Normals. 4 lookups
+	vec3 w_tangent, w_binormal;
+	vec3 w_normal = get_normal(uv2, w_tangent, w_binormal);
+	NORMAL = mat3(VIEW_MATRIX) * w_normal;
+	TANGENT = mat3(VIEW_MATRIX) * w_tangent;
+	BINORMAL = mat3(VIEW_MATRIX) * w_binormal;
+
+	// Apply PBR
+	ALBEDO=vec3(.2);
+}
+

addons/terrain_3d/extras/project_on_terrain3d.gd

@@ -0,0 +1,90 @@
+# This script is an addon for HungryProton's Scatter https://github.com/HungryProton/scatter
+# It provides a `Project on Terrain3D` modifier, which allows Scatter 
+# to detect the terrain height from Terrain3D without using collision.
+# Copy this file into /addons/proton_scatter/src/modifiers
+# Then uncomment everything below
+# In the editor, add this modifier to Scatter, then set your Terrain3D node
+
+# This script is an addon for HungryProton's Scatter https://github.com/HungryProton/scatter
+# It allows Scatter to detect the terrain height from Terrain3D
+# Copy this file into /addons/proton_scatter/src/modifiers
+# Then uncomment everything below (select, press CTRL+K)
+# In the editor, add this modifier, then set your Terrain3D node
+
+#@tool
+#extends "base_modifier.gd"
+#
+#
+#signal projection_completed
+#
+#
+#@export var terrain_node : NodePath
+#@export var align_with_collision_normal := false
+#
+#var _terrain: Terrain3D
+#
+#
+#func _init() -> void:
+	#display_name = "Project On Terrain3D"
+	#category = "Edit"
+	#can_restrict_height = false
+	#global_reference_frame_available = true
+	#local_reference_frame_available = true
+	#individual_instances_reference_frame_available = true
+	#use_global_space_by_default()
+#
+	#documentation.add_paragraph(
+		#"This is a duplicate of `Project on Colliders` that queries the terrain system
+		#for height and sets the transform height appropriately.
+#
+		#This modifier must have terrain_node set to a Terrain3D node.")
+#
+	#var p := documentation.add_parameter("Terrain Node")
+	#p.set_type("NodePath")
+	#p.set_description("Set your Terrain3D node.")
+		#
+	#p = documentation.add_parameter("Align with collision normal")
+	#p.set_type("bool")
+	#p.set_description(
+		#"Rotate the transform to align it with the collision normal in case
+		#the ray cast hit a collider.")
+#
+#
+#func _process_transforms(transforms, domain, _seed) -> void:
+	#if transforms.is_empty():
+		#return
+#
+	#if terrain_node:
+		#_terrain = domain.get_root().get_node_or_null(terrain_node)
+#
+	#if not _terrain:
+		#warning += """No Terrain3D node found"""
+		#return
+#
+	#if not _terrain.storage:
+		#warning += """Terrain3D storage is not initialized"""
+		#return
+#
+	## Get global transform
+	#var gt: Transform3D = domain.get_global_transform()
+	#var gt_inverse := gt.affine_inverse()
+	#for i in transforms.list.size():
+		#var location: Vector3 = (gt * transforms.list[i]).origin
+		#var height: float = _terrain.storage.get_height(location)
+		#var normal: Vector3 = _terrain.storage.get_normal(location)
+		#
+		#if align_with_collision_normal and not is_nan(normal.x):
+			#transforms.list[i].basis.y = normal
+			#transforms.list[i].basis.x = -transforms.list[i].basis.z.cross(normal)
+			#transforms.list[i].basis = transforms.list[i].basis.orthonormalized()
+#
+		#transforms.list[i].origin.y = gt.origin.y if is_nan(height) else height - gt.origin.y
+#
+	#if transforms.is_empty():
+		#warning += """Every point has been removed. Possible reasons include: \n
+		#+ No collider is close enough to the shapes.
+		#+ Ray length is too short.
+		#+ Ray direction is incorrect.
+		#+ Collision mask is not set properly.
+		#+ Max slope is too low.
+		#"""

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addons/terrain_3d/icons/wetness.svg.import

@@ -0,0 +1,38 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bcgg0srmqsh3n"
+path="res://.godot/imported/wetness.svg-9b2ddec096ab7734492b77b20c75c82b.ctex"
+metadata={
+"has_editor_variant": true,
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://addons/terrain_3d/icons/wetness.svg"
+dest_files=["res://.godot/imported/wetness.svg-9b2ddec096ab7734492b77b20c75c82b.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=true
+editor/convert_colors_with_editor_theme=false

addons/terrain_3d/plugin.cfg

@@ -0,0 +1,7 @@
+[plugin]
+
+name="Terrain3D"
+description="A high performance, editable terrain system for Godot 4."
+author="Cory Petkovsek & Roope Palmroos"
+version="0.9.2"
+script="editor.gd"

addons/terrain_3d/src/asset_dock.gd

@@ -0,0 +1,832 @@
+@tool
+extends PanelContainer
+#class_name Terrain3DAssetDock
+
+signal confirmation_closed
+signal confirmation_confirmed
+signal confirmation_canceled
+
+const PS_DOCK_SLOT: String = "terrain3d/config/dock_slot"
+const PS_DOCK_TILE_SIZE: String = "terrain3d/config/dock_tile_size"
+const PS_DOCK_FLOATING: String = "terrain3d/config/dock_floating"
+const PS_DOCK_PINNED: String = "terrain3d/config/dock_always_on_top"
+const PS_DOCK_WINDOW_POSITION: String = "terrain3d/config/dock_window_position"
+const PS_DOCK_WINDOW_SIZE: String = "terrain3d/config/dock_window_size"
+
+var texture_list: ListContainer
+var mesh_list: ListContainer
+var _current_list: ListContainer
+var _last_thumb_update_time: int = 0
+const MAX_UPDATE_TIME: int = 1000
+
+var placement_opt: OptionButton
+var floating_btn: Button
+var pinned_btn: Button
+var size_slider: HSlider
+var box: BoxContainer
+var buttons: BoxContainer
+var textures_btn: Button
+var meshes_btn: Button
+var asset_container: ScrollContainer
+var confirm_dialog: ConfirmationDialog
+var _confirmed: bool = false
+
+# Used only for editor, so change to single visible/hiddden
+enum {
+	HIDDEN = -1,
+	SIDEBAR = 0,
+	BOTTOM = 1,
+	WINDOWED = 2,
+}
+var state: int = HIDDEN
+
+var window: Window
+var _godot_editor_window: Window # The main Godot Editor window
+var _godot_last_state: Window.Mode = Window.MODE_FULLSCREEN
+
+enum {
+	POS_LEFT_UL = 0,
+	POS_LEFT_BL = 1,
+	POS_LEFT_UR = 2,
+	POS_LEFT_BR = 3,
+	POS_RIGHT_UL = 4,
+	POS_RIGHT_BL = 5,
+	POS_RIGHT_UR = 6,
+	POS_RIGHT_BR = 7,
+	POS_BOTTOM = 8,
+	POS_MAX = 9,
+}
+var slot: int = POS_RIGHT_BR
+var _initialized: bool = false
+var plugin: EditorPlugin
+var editor_settings: EditorSettings
+
+
+func initialize(p_plugin: EditorPlugin) -> void:
+	if p_plugin:
+		plugin = p_plugin
+
+	# Get editor window. Structure is root:Window/EditorNode/Base Control
+	_godot_editor_window = plugin.get_editor_interface().get_base_control().get_parent().get_parent()
+	_godot_last_state = _godot_editor_window.mode
+	
+	placement_opt = $Box/Buttons/PlacementOpt
+	pinned_btn = $Box/Buttons/Pinned
+	floating_btn = $Box/Buttons/Floating
+	floating_btn.owner = null
+	size_slider = $Box/Buttons/SizeSlider
+	size_slider.owner = null
+	box = $Box
+	buttons = $Box/Buttons
+	textures_btn = $Box/Buttons/TexturesBtn
+	meshes_btn = $Box/Buttons/MeshesBtn
+	asset_container = $Box/ScrollContainer
+
+	texture_list = ListContainer.new()
+	texture_list.plugin = plugin
+	texture_list.type = Terrain3DAssets.TYPE_TEXTURE
+	asset_container.add_child(texture_list)
+	mesh_list = ListContainer.new()
+	mesh_list.plugin = plugin
+	mesh_list.type = Terrain3DAssets.TYPE_MESH
+	mesh_list.visible = false
+	asset_container.add_child(mesh_list)
+	_current_list = texture_list
+
+	editor_settings = EditorInterface.get_editor_settings()
+	load_editor_settings()
+
+	# Connect signals
+	resized.connect(update_layout)
+	textures_btn.pressed.connect(_on_textures_pressed)
+	meshes_btn.pressed.connect(_on_meshes_pressed)
+	placement_opt.item_selected.connect(set_slot)
+	floating_btn.pressed.connect(make_dock_float)
+	pinned_btn.toggled.connect(_on_pin_changed)
+	pinned_btn.visible = false
+	size_slider.value_changed.connect(_on_slider_changed)
+	plugin.ui.toolbar.tool_changed.connect(_on_tool_changed)
+
+	meshes_btn.add_theme_font_size_override("font_size", 16 * EditorInterface.get_editor_scale())
+	textures_btn.add_theme_font_size_override("font_size", 16 * EditorInterface.get_editor_scale())
+
+	_initialized = true
+	update_dock(plugin.visible)
+	update_layout()
+
+
+func _ready() -> void:
+	if not _initialized:
+		return
+		
+	# Setup styles
+	set("theme_override_styles/panel", get_theme_stylebox("panel", "Panel"))
+	# Avoid saving icon resources in tscn when editing w/ a tool script
+	if plugin.get_editor_interface().get_edited_scene_root() != self:
+		pinned_btn.icon = get_theme_icon("Pin", "EditorIcons")
+		pinned_btn.text = ""
+		floating_btn.icon = get_theme_icon("MakeFloating", "EditorIcons")
+		floating_btn.text = ""
+
+	update_thumbnails()
+	confirm_dialog = ConfirmationDialog.new()
+	add_child(confirm_dialog)
+	confirm_dialog.hide()
+	confirm_dialog.confirmed.connect(func(): _confirmed = true; \
+		emit_signal("confirmation_closed"); \
+		emit_signal("confirmation_confirmed") )
+	confirm_dialog.canceled.connect(func(): _confirmed = false; \
+		emit_signal("confirmation_closed"); \
+		emit_signal("confirmation_canceled") )
+
+
+func get_current_list() -> ListContainer:
+	return _current_list
+
+
+## Dock placement
+
+func set_slot(p_slot: int) -> void:
+	p_slot = clamp(p_slot, 0, POS_MAX-1)
+	
+	if slot != p_slot:
+		slot = p_slot
+		placement_opt.selected = slot
+		save_editor_settings()
+		plugin.select_terrain()
+		update_dock(plugin.visible)
+
+
+func remove_dock(p_force: bool = false) -> void:
+	if state == SIDEBAR:
+		plugin.remove_control_from_docks(self)
+		state = HIDDEN
+
+	elif state == BOTTOM:
+		plugin.remove_control_from_bottom_panel(self)
+		state = HIDDEN
+
+	# If windowed and destination is not window or final exit, otherwise leave
+	elif state == WINDOWED and p_force:
+		if not window:
+			return
+		var parent: Node = get_parent()
+		if parent:
+			parent.remove_child(self)
+			_godot_editor_window.mouse_entered.disconnect(_on_godot_window_entered)
+			_godot_editor_window.focus_entered.disconnect(_on_godot_focus_entered)
+			_godot_editor_window.focus_exited.disconnect(_on_godot_focus_exited)
+			window.hide()
+			window.queue_free()
+			window = null
+		floating_btn.button_pressed = false
+		floating_btn.visible = true
+		pinned_btn.visible = false
+		placement_opt.visible = true
+		state = HIDDEN
+		update_dock(plugin.visible) # return window to side/bottom
+
+
+func update_dock(p_visible: bool) -> void:
+	update_assets()
+	if not _initialized:
+		return
+
+	if window:
+		return
+	elif floating_btn.button_pressed:
+		# No window, but floating button pressed, occurs when from editor settings
+		make_dock_float()
+		return
+
+	remove_dock()
+	# Add dock to new destination
+	# Sidebar
+	if slot < POS_BOTTOM:
+		state = SIDEBAR
+		plugin.add_control_to_dock(slot, self)
+	elif slot == POS_BOTTOM:
+		state = BOTTOM
+		plugin.add_control_to_bottom_panel(self, "Terrain3D")
+		if p_visible:
+			plugin.make_bottom_panel_item_visible(self)
+		
+
+func update_layout() -> void:
+	if not _initialized:
+		return
+
+	# Detect if we have a new window from Make floating, grab it so we can free it properly
+	if not window and get_parent() and get_parent().get_parent() is Window:
+		window = get_parent().get_parent()
+		make_dock_float()
+		return # Will call this function again upon display
+
+	var size_parent: Control = size_slider.get_parent()
+	# Vertical layout in window / sidebar
+	if window or slot < POS_BOTTOM:
+		box.vertical = true
+		buttons.vertical = false
+
+		if size.x >= 500 and size_parent != buttons:
+			size_slider.reparent(buttons)
+			buttons.move_child(size_slider, 3)
+		elif size.x < 500 and size_parent != box:
+			size_slider.reparent(box)
+			box.move_child(size_slider, 1)
+		floating_btn.reparent(buttons)
+		buttons.move_child(floating_btn, 4)
+
+	# Wide layout on bottom bar
+	else:
+		size_slider.reparent(buttons)
+		buttons.move_child(size_slider, 3)
+		floating_btn.reparent(box)
+		box.vertical = false
+		buttons.vertical = true
+
+	save_editor_settings()
+
+
+func update_thumbnails() -> void:
+	if not is_instance_valid(plugin.terrain):
+		return
+	if _current_list.type == Terrain3DAssets.TYPE_MESH and \
+			Time.get_ticks_msec() - _last_thumb_update_time > MAX_UPDATE_TIME:
+		plugin.terrain.assets.create_mesh_thumbnails()
+		_last_thumb_update_time = Time.get_ticks_msec()
+		for mesh_asset in mesh_list.entries:
+			mesh_asset.queue_redraw()
+## Dock Button handlers
+
+
+func _on_pin_changed(toggled: bool) -> void:
+	if window:
+		window.always_on_top = pinned_btn.button_pressed
+	save_editor_settings()
+
+
+func _on_slider_changed(value: float) -> void:
+	if texture_list:
+		texture_list.set_entry_width(value)
+	if mesh_list:
+		mesh_list.set_entry_width(value)
+	save_editor_settings()
+
+
+func _on_textures_pressed() -> void:
+	_current_list = texture_list
+	texture_list.update_asset_list()
+	texture_list.visible = true
+	mesh_list.visible = false
+	textures_btn.button_pressed = true
+	meshes_btn.button_pressed = false
+	texture_list.set_selected_id(texture_list.selected_id)
+	plugin.get_editor_interface().edit_node(plugin.terrain)
+
+
+func _on_meshes_pressed() -> void:
+	_current_list = mesh_list
+	mesh_list.update_asset_list()
+	mesh_list.visible = true
+	texture_list.visible = false
+	meshes_btn.button_pressed = true
+	textures_btn.button_pressed = false
+	mesh_list.set_selected_id(mesh_list.selected_id)
+	plugin.get_editor_interface().edit_node(plugin.terrain)
+	update_thumbnails()
+
+
+func _on_tool_changed(p_tool: Terrain3DEditor.Tool, p_operation: Terrain3DEditor.Operation) -> void:
+	if p_tool == Terrain3DEditor.INSTANCER:
+		_on_meshes_pressed()
+	elif p_tool == Terrain3DEditor.TEXTURE:
+		_on_textures_pressed()
+
+
+## Update Dock Contents
+
+
+func update_assets() -> void:
+	if not _initialized:
+		return
+	
+	# Verify signals to individual lists
+	if plugin.is_terrain_valid() and plugin.terrain.assets:
+		if not plugin.terrain.assets.textures_changed.is_connected(texture_list.update_asset_list):
+			plugin.terrain.assets.textures_changed.connect(texture_list.update_asset_list)
+		if not plugin.terrain.assets.meshes_changed.is_connected(mesh_list.update_asset_list):
+			plugin.terrain.assets.meshes_changed.connect(mesh_list.update_asset_list)
+
+	_current_list.update_asset_list()
+
+## Window Management
+
+
+func make_dock_float() -> void:
+	# If already created (eg from editor Make Floating)	
+	if not window:
+		remove_dock()
+		create_window()
+
+	state = WINDOWED
+	pinned_btn.visible = true
+	floating_btn.visible = false
+	placement_opt.visible = false
+	window.title = "Terrain3D Asset Dock"
+	window.always_on_top = pinned_btn.button_pressed
+	window.close_requested.connect(remove_dock.bind(true))
+	visible = true # Is hidden when pops off of bottom. ??
+	_godot_editor_window.grab_focus()
+
+
+func create_window() -> void:
+	window = Window.new()
+	window.wrap_controls = true
+	var mc := MarginContainer.new()
+	mc.set_anchors_preset(PRESET_FULL_RECT, false)
+	mc.add_child(self)
+	window.add_child(mc)
+	window.set_transient(false)
+	window.set_size(get_setting(PS_DOCK_WINDOW_SIZE, Vector2i(512, 512)))
+	window.set_position(get_setting(PS_DOCK_WINDOW_POSITION, Vector2i(704, 284)))
+	plugin.add_child(window)
+	window.show()
+	window.window_input.connect(_on_window_input)
+	window.focus_exited.connect(_on_window_focus_exited)
+	_godot_editor_window.mouse_entered.connect(_on_godot_window_entered)
+	_godot_editor_window.focus_entered.connect(_on_godot_focus_entered)
+	_godot_editor_window.focus_exited.connect(_on_godot_focus_exited)
+
+
+func _on_window_input(event: InputEvent) -> void:
+	# Capture CTRL+S when doc focused to save scene)
+	if event is InputEventKey and event.keycode == KEY_S and event.pressed and event.is_command_or_control_pressed():
+		save_editor_settings()
+		plugin.get_editor_interface().save_scene()
+
+
+func _on_window_focus_exited() -> void:
+	# Capture window position w/o other changes
+	save_editor_settings()
+
+
+func _on_godot_window_entered() -> void:
+	if is_instance_valid(window) and window.has_focus():
+		_godot_editor_window.grab_focus()
+
+
+func _on_godot_focus_entered() -> void:
+	# If asset dock is windowed, and Godot was minimized, and now is not, restore asset dock window
+	if is_instance_valid(window):
+		if _godot_last_state == Window.MODE_MINIMIZED and _godot_editor_window.mode != Window.MODE_MINIMIZED:
+			window.show()
+			_godot_last_state = _godot_editor_window.mode
+			_godot_editor_window.grab_focus()
+
+
+func _on_godot_focus_exited() -> void:
+	if is_instance_valid(window) and _godot_editor_window.mode == Window.MODE_MINIMIZED:
+		window.hide()
+		_godot_last_state = _godot_editor_window.mode
+
+
+## Manage Editor Settings
+
+
+func get_setting(p_str: String, p_default: Variant) -> Variant:
+	if editor_settings.has_setting(p_str):
+		return editor_settings.get_setting(p_str)
+	else:
+		return p_default
+
+
+func load_editor_settings() -> void:
+	floating_btn.button_pressed = get_setting(PS_DOCK_FLOATING, false)
+	pinned_btn.button_pressed = get_setting(PS_DOCK_PINNED, true)
+	size_slider.value = get_setting(PS_DOCK_TILE_SIZE, 83)
+	set_slot(get_setting(PS_DOCK_SLOT, POS_BOTTOM))
+	_on_slider_changed(size_slider.value)
+	# Window pos/size set on window creation in update_dock
+	update_dock(plugin.visible)
+	
+	
+func save_editor_settings() -> void:
+	if not _initialized:
+		return
+	editor_settings.set_setting(PS_DOCK_SLOT, slot)
+	editor_settings.set_setting(PS_DOCK_TILE_SIZE, size_slider.value)
+	editor_settings.set_setting(PS_DOCK_FLOATING, floating_btn.button_pressed)
+	editor_settings.set_setting(PS_DOCK_PINNED, pinned_btn.button_pressed)
+	if window:
+		editor_settings.set_setting(PS_DOCK_WINDOW_SIZE, window.size)
+		editor_settings.set_setting(PS_DOCK_WINDOW_POSITION, window.position)
+
+
+##############################################################
+## class ListContainer
+##############################################################
+
+	
+class ListContainer extends Container:
+	var plugin: EditorPlugin
+	var type := Terrain3DAssets.TYPE_TEXTURE
+	var entries: Array[ListEntry]
+	var selected_id: int = 0
+	var height: float = 0
+	var width: float = 83
+	var focus_style: StyleBox
+
+	
+	func _ready() -> void:
+		set_v_size_flags(SIZE_EXPAND_FILL)
+		set_h_size_flags(SIZE_EXPAND_FILL)
+		focus_style = get_theme_stylebox("focus", "Button").duplicate()
+		focus_style.set_border_width_all(2)
+		focus_style.set_border_color(Color(1, 1, 1, .67))
+
+
+	func clear() -> void:
+		for e in entries:
+			e.get_parent().remove_child(e)
+			e.queue_free()
+		entries.clear()
+
+
+	func update_asset_list() -> void:
+		clear()
+		
+		# Grab terrain
+		var t: Terrain3D
+		if plugin.is_terrain_valid():
+			t = plugin.terrain
+		elif is_instance_valid(plugin._last_terrain) and plugin.is_terrain_valid(plugin._last_terrain):
+			t = plugin._last_terrain
+		else:
+			return
+		
+		if not t.assets:
+			return
+		
+		if type == Terrain3DAssets.TYPE_TEXTURE:
+			var texture_count: int = t.assets.get_texture_count()
+			for i in texture_count:
+				var texture: Terrain3DTextureAsset = t.assets.get_texture(i)
+				add_item(texture)
+			if texture_count < Terrain3DAssets.MAX_TEXTURES:
+				add_item()
+		else:
+			var mesh_count: int = t.assets.get_mesh_count()
+			for i in mesh_count:
+				var mesh: Terrain3DMeshAsset = t.assets.get_mesh_asset(i)
+				add_item(mesh, t.assets)
+			if mesh_count < Terrain3DAssets.MAX_MESHES:
+				add_item()
+			if selected_id >= mesh_count or selected_id < 0:
+				set_selected_id(0)
+
+
+	func add_item(p_resource: Resource = null, p_assets: Terrain3DAssets = null) -> void:
+		var entry: ListEntry = ListEntry.new()
+		entry.focus_style = focus_style
+		var id: int = entries.size()
+		
+		entry.set_edited_resource(p_resource)
+		entry.hovered.connect(_on_resource_hovered.bind(id))
+		entry.selected.connect(set_selected_id.bind(id))
+		entry.inspected.connect(_on_resource_inspected)
+		entry.changed.connect(_on_resource_changed.bind(id))
+		entry.type = type
+		entry.asset_list = p_assets
+		add_child(entry)
+		entries.push_back(entry)
+		
+		if p_resource:
+			entry.set_selected(id == selected_id)
+			if not p_resource.id_changed.is_connected(set_selected_after_swap):
+				p_resource.id_changed.connect(set_selected_after_swap)
+
+
+	func _on_resource_hovered(p_id: int):
+		if type == Terrain3DAssets.TYPE_MESH:
+			if plugin.terrain:
+				plugin.terrain.assets.create_mesh_thumbnails(p_id)
+
+	
+	func set_selected_after_swap(p_type: Terrain3DAssets.AssetType, p_old_id: int, p_new_id: int) -> void:
+		set_selected_id(clamp(p_new_id, 0, entries.size() - 2))
+
+
+	func set_selected_id(p_id: int) -> void:
+		selected_id = p_id
+		
+		for i in entries.size():
+			var entry: ListEntry = entries[i]
+			entry.set_selected(i == selected_id)
+		
+		plugin.select_terrain()
+
+		# Select Paint tool if clicking a texture
+		if type == Terrain3DAssets.TYPE_TEXTURE and plugin.editor.get_tool() != Terrain3DEditor.TEXTURE:
+			var paint_btn: Button = plugin.ui.toolbar.get_node_or_null("PaintBaseTexture")
+			if paint_btn:
+				paint_btn.set_pressed(true)
+				plugin.ui._on_tool_changed(Terrain3DEditor.TEXTURE, Terrain3DEditor.REPLACE)
+
+		elif type == Terrain3DAssets.TYPE_MESH and plugin.editor.get_tool() != Terrain3DEditor.INSTANCER:
+			var instancer_btn: Button = plugin.ui.toolbar.get_node_or_null("InstanceMeshes")
+			if instancer_btn:
+				instancer_btn.set_pressed(true)
+				plugin.ui._on_tool_changed(Terrain3DEditor.INSTANCER, Terrain3DEditor.ADD)
+		
+		# Update editor with selected brush
+		plugin.ui._on_setting_changed()
+
+
+	func _on_resource_inspected(p_resource: Resource) -> void:
+		await get_tree().create_timer(.01).timeout
+		plugin.get_editor_interface().edit_resource(p_resource)
+	
+	
+	func _on_resource_changed(p_resource: Resource, p_id: int) -> void:
+		if not p_resource:
+			var asset_dock: Control = get_parent().get_parent().get_parent()
+			if type == Terrain3DAssets.TYPE_TEXTURE:
+				asset_dock.confirm_dialog.dialog_text = "Are you sure you want to clear this texture?"
+			else:
+				asset_dock.confirm_dialog.dialog_text = "Are you sure you want to clear this mesh and delete all instances?"
+			asset_dock.confirm_dialog.popup_centered()
+			await asset_dock.confirmation_closed
+			if not asset_dock._confirmed:
+				update_asset_list()
+				return
+			
+		if not plugin.is_terrain_valid():
+			plugin.select_terrain()
+			await get_tree().create_timer(.01).timeout
+
+		if plugin.is_terrain_valid():
+			if type == Terrain3DAssets.TYPE_TEXTURE:
+				plugin.terrain.get_assets().set_texture(p_id, p_resource)
+			else:
+				plugin.terrain.get_assets().set_mesh_asset(p_id, p_resource)
+				await get_tree().create_timer(.01).timeout
+				plugin.terrain.assets.create_mesh_thumbnails(p_id)
+
+			# If removing an entry, clear inspector
+			if not p_resource:
+				plugin.get_editor_interface().inspect_object(null)			
+				
+		# If null resource, remove last 
+		if not p_resource:
+			var last_offset: int = 2
+			if p_id == entries.size()-2:
+				last_offset = 3
+			set_selected_id(clamp(selected_id, 0, entries.size() - last_offset))
+
+		# Update editor with selected brush
+		plugin.ui._on_setting_changed()
+
+
+	func get_selected_id() -> int:
+		return selected_id
+
+
+
+	func set_entry_width(value: float) -> void:
+		width = clamp(value, 56, 230)
+		redraw()
+
+
+	func get_entry_width() -> float:
+		return width
+	
+
+	func redraw() -> void:
+		height = 0
+		var id: int = 0
+		var separation: float = 4
+		var columns: int = 3
+		columns = clamp(size.x / width, 1, 100)
+		
+		for c in get_children():
+			if is_instance_valid(c):
+				c.size = Vector2(width, width) - Vector2(separation, separation)
+				c.position = Vector2(id % columns, id / columns) * width + \
+					Vector2(separation / columns, separation / columns)
+				height = max(height, c.position.y + width)
+				id += 1
+
+
+	# Needed to enable ScrollContainer scroll bar
+	func _get_minimum_size() -> Vector2:
+		return Vector2(0, height)
+
+		
+	func _notification(p_what) -> void:
+		if p_what == NOTIFICATION_SORT_CHILDREN:
+			redraw()
+
+
+##############################################################
+## class ListEntry
+##############################################################
+
+
+class ListEntry extends VBoxContainer:
+	signal hovered()
+	signal selected()
+	signal changed(resource: Resource)
+	signal inspected(resource: Resource)
+	
+	var resource: Resource
+	var type := Terrain3DAssets.TYPE_TEXTURE
+	var _thumbnail: Texture2D
+	var drop_data: bool = false
+	var is_hovered: bool = false
+	var is_selected: bool = false
+	var asset_list: Terrain3DAssets
+	
+	var button_clear: TextureButton
+	var button_edit: TextureButton
+	var name_label: Label
+	
+	@onready var add_icon: Texture2D = get_theme_icon("Add", "EditorIcons")
+	@onready var clear_icon: Texture2D = get_theme_icon("Close", "EditorIcons")
+	@onready var edit_icon: Texture2D = get_theme_icon("Edit", "EditorIcons")
+	@onready var background: StyleBox = get_theme_stylebox("pressed", "Button")
+	var focus_style: StyleBox
+
+
+	func _ready() -> void:
+		var icon_size: Vector2 = Vector2(12, 12)
+		
+		button_clear = TextureButton.new()
+		button_clear.set_texture_normal(clear_icon)
+		button_clear.set_custom_minimum_size(icon_size)
+		button_clear.set_h_size_flags(Control.SIZE_SHRINK_END)
+		button_clear.set_visible(resource != null)
+		button_clear.pressed.connect(clear)
+		add_child(button_clear)
+		
+		button_edit = TextureButton.new()
+		button_edit.set_texture_normal(edit_icon)
+		button_edit.set_custom_minimum_size(icon_size)
+		button_edit.set_h_size_flags(Control.SIZE_SHRINK_END)
+		button_edit.set_visible(resource != null)
+		button_edit.pressed.connect(edit)
+		add_child(button_edit)
+		
+		name_label = Label.new()
+		add_child(name_label, true)
+		name_label.visible = false
+		name_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
+		name_label.vertical_alignment = VERTICAL_ALIGNMENT_BOTTOM
+		name_label.size_flags_vertical = Control.SIZE_EXPAND_FILL
+		name_label.add_theme_color_override("font_shadow_color", Color.BLACK)
+		name_label.add_theme_constant_override("shadow_offset_x", 1)
+		name_label.add_theme_constant_override("shadow_offset_y", 1)
+		name_label.add_theme_font_size_override("font_size", 15)
+		name_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
+		name_label.text_overrun_behavior = TextServer.OVERRUN_TRIM_ELLIPSIS
+		if type == Terrain3DAssets.TYPE_TEXTURE:
+			name_label.text = "Add Texture"
+		else:
+			name_label.text = "Add Mesh"
+
+		
+	func _notification(p_what) -> void:
+		match p_what:
+			NOTIFICATION_DRAW:
+				var rect: Rect2 = Rect2(Vector2.ZERO, get_size())
+				if !resource:
+					draw_style_box(background, rect)
+					draw_texture(add_icon, (get_size() / 2) - (add_icon.get_size() / 2))
+				else:
+					if type == Terrain3DAssets.TYPE_TEXTURE:
+						name_label.text = (resource as Terrain3DTextureAsset).get_name()
+						self_modulate = resource.get_albedo_color()
+						_thumbnail = resource.get_albedo_texture()
+						if _thumbnail:
+							draw_texture_rect(_thumbnail, rect, false)
+							texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST_WITH_MIPMAPS
+					else:
+						name_label.text = (resource as Terrain3DMeshAsset).get_name()
+						var id: int = (resource as Terrain3DMeshAsset).get_id()
+						_thumbnail = resource.get_thumbnail()
+						if _thumbnail:
+							draw_texture_rect(_thumbnail, rect, false)
+							texture_filter = CanvasItem.TEXTURE_FILTER_LINEAR_WITH_MIPMAPS
+						else:
+							draw_rect(rect, Color(.15, .15, .15, 1.))
+				name_label.add_theme_font_size_override("font_size", 4 + rect.size.x/10)
+				if drop_data:
+					draw_style_box(focus_style, rect)
+				if is_hovered:
+					draw_rect(rect, Color(1, 1, 1, 0.2))
+				if is_selected:
+					draw_style_box(focus_style, rect)
+			NOTIFICATION_MOUSE_ENTER:
+				is_hovered = true
+				name_label.visible = true
+				emit_signal("hovered")
+				queue_redraw()
+			NOTIFICATION_MOUSE_EXIT:
+				is_hovered = false
+				name_label.visible = false
+				drop_data = false
+				queue_redraw()
+
+	
+	func _gui_input(p_event: InputEvent) -> void:
+		if p_event is InputEventMouseButton:
+			if p_event.is_pressed():
+				match p_event.get_button_index():
+					MOUSE_BUTTON_LEFT:
+						# If `Add new` is clicked
+						if !resource:
+							if type == Terrain3DAssets.TYPE_TEXTURE:
+								set_edited_resource(Terrain3DTextureAsset.new(), false)
+							else:
+								set_edited_resource(Terrain3DMeshAsset.new(), false)
+							edit()
+						else:
+							emit_signal("selected")
+					MOUSE_BUTTON_RIGHT:
+						if resource:
+							edit()
+					MOUSE_BUTTON_MIDDLE:
+						if resource:
+							clear()
+
+
+	func _can_drop_data(p_at_position: Vector2, p_data: Variant) -> bool:
+		drop_data = false
+		if typeof(p_data) == TYPE_DICTIONARY:
+			if p_data.files.size() == 1:
+				queue_redraw()
+				drop_data = true
+		return drop_data
+
+		
+	func _drop_data(p_at_position: Vector2, p_data: Variant) -> void:
+		if typeof(p_data) == TYPE_DICTIONARY:
+			var res: Resource = load(p_data.files[0])
+			if res is Texture2D and type == Terrain3DAssets.TYPE_TEXTURE:
+				var ta := Terrain3DTextureAsset.new()
+				if resource is Terrain3DTextureAsset:
+					ta.id = resource.id
+				ta.set_albedo_texture(res)
+				set_edited_resource(ta, false)
+				resource = ta
+			elif res is Terrain3DTextureAsset and type == Terrain3DAssets.TYPE_TEXTURE:
+				if resource is Terrain3DTextureAsset:
+					res.id = resource.id
+				set_edited_resource(res, false)
+			elif res is PackedScene and type == Terrain3DAssets.TYPE_MESH:
+				var ma := Terrain3DMeshAsset.new()
+				if resource is Terrain3DMeshAsset:
+					ma.id = resource.id
+				ma.set_scene_file(res)
+				set_edited_resource(ma, false)
+				resource = ma
+			elif res is Terrain3DMeshAsset and type == Terrain3DAssets.TYPE_MESH:
+				if resource is Terrain3DMeshAsset:
+					res.id = resource.id
+				set_edited_resource(res, false)
+			emit_signal("selected")
+			emit_signal("inspected", resource)
+
+
+
+	func set_edited_resource(p_res: Resource, p_no_signal: bool = true) -> void:
+		resource = p_res
+		if resource:
+			resource.setting_changed.connect(_on_resource_changed)
+			resource.file_changed.connect(_on_resource_changed)
+		
+		if button_clear:
+			button_clear.set_visible(resource != null)
+			
+		queue_redraw()
+		if !p_no_signal:
+			emit_signal("changed", resource)
+
+
+	func _on_resource_changed() -> void:
+		emit_signal("changed", resource)
+
+
+	func set_selected(value: bool) -> void:
+		is_selected = value
+		queue_redraw()
+
+
+	func clear() -> void:
+		if resource:
+			set_edited_resource(null, false)
+
+	
+	func edit() -> void:
+		emit_signal("selected")
+		emit_signal("inspected", resource)

addons/terrain_3d/src/asset_dock.tscn

@@ -0,0 +1,93 @@
+[gd_scene load_steps=2 format=3 uid="uid://dkb6hii5e48m2"]
+
+[ext_resource type="Script" path="res://addons/terrain_3d/src/asset_dock.gd" id="1_e23pg"]
+
+[node name="Terrain3D" type="PanelContainer"]
+custom_minimum_size = Vector2(256, 95)
+offset_right = 766.0
+offset_bottom = 100.0
+script = ExtResource("1_e23pg")
+
+[node name="Box" type="BoxContainer" parent="."]
+layout_mode = 2
+size_flags_vertical = 3
+vertical = true
+
+[node name="Buttons" type="BoxContainer" parent="Box"]
+layout_mode = 2
+
+[node name="TexturesBtn" type="Button" parent="Box/Buttons"]
+custom_minimum_size = Vector2(80, 30)
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 0
+theme_override_font_sizes/font_size = 16
+toggle_mode = true
+button_pressed = true
+text = "Textures"
+
+[node name="MeshesBtn" type="Button" parent="Box/Buttons"]
+custom_minimum_size = Vector2(80, 30)
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 0
+theme_override_font_sizes/font_size = 16
+toggle_mode = true
+text = "Meshes"
+
+[node name="PlacementOpt" type="OptionButton" parent="Box/Buttons"]
+custom_minimum_size = Vector2(80, 30)
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 0
+item_count = 9
+selected = 7
+popup/item_0/text = "Left_UL"
+popup/item_0/id = 0
+popup/item_1/text = "Left_BL"
+popup/item_1/id = 1
+popup/item_2/text = "Left_UR"
+popup/item_2/id = 2
+popup/item_3/text = "Left_BR"
+popup/item_3/id = 3
+popup/item_4/text = "Right_UL"
+popup/item_4/id = 4
+popup/item_5/text = "Right_BL "
+popup/item_5/id = 5
+popup/item_6/text = "Right_UR"
+popup/item_6/id = 6
+popup/item_7/text = "Right_BR"
+popup/item_7/id = 7
+popup/item_8/text = "Bottom"
+popup/item_8/id = 8
+
+[node name="SizeSlider" type="HSlider" parent="Box/Buttons"]
+custom_minimum_size = Vector2(80, 10)
+layout_mode = 2
+size_flags_horizontal = 3
+min_value = 56.0
+max_value = 230.0
+value = 83.0
+
+[node name="Floating" type="Button" parent="Box/Buttons"]
+layout_mode = 2
+size_flags_horizontal = 0
+size_flags_vertical = 0
+tooltip_text = "Pop this dock out to a floating window."
+toggle_mode = true
+text = "F"
+flat = true
+
+[node name="Pinned" type="Button" parent="Box/Buttons"]
+layout_mode = 2
+size_flags_horizontal = 0
+size_flags_vertical = 0
+tooltip_text = "Make this window \"Always on top\"."
+toggle_mode = true
+text = "P"
+flat = true
+
+[node name="ScrollContainer" type="ScrollContainer" parent="Box"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3

addons/terrain_3d/src/bake_lod_dialog.gd

@@ -0,0 +1,28 @@
+@tool
+extends ConfirmationDialog
+
+var lod: int = 0
+var description: String = ""
+
+
+func _ready() -> void:
+	set_unparent_when_invisible(true)
+	about_to_popup.connect(_on_about_to_popup)
+	visibility_changed.connect(_on_visibility_changed)
+	%LodBox.value_changed.connect(_on_lod_box_value_changed)
+
+
+func _on_about_to_popup() -> void:
+	lod = %LodBox.value
+
+
+func _on_visibility_changed() -> void:
+	# Change text on the autowrap label only when the popup is visible.
+	# Works around Godot issue #47005:
+	# https://github.com/godotengine/godot/issues/47005
+	if visible:
+		%DescriptionLabel.text = description
+
+
+func _on_lod_box_value_changed(p_value: float) -> void:
+	lod = %LodBox.value