terrain 3d

addons/terrain_3d/LICENSE.txt

+MIT License
+
+Copyright (c) 2023-2026 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.
\ No newline at end of file

addons/terrain_3d/README.md

+![Terrain3D Logo](/doc/docs/images/terrain3d.jpg)
+
+# Terrain3D
+A high performance, editable terrain system for Godot 4.
+
+
+## Features
+* Written in C++ as a GDExtension addon, which works with official builds of Godot Engine
+* [Can be accessed](https://terrain3d.readthedocs.io/en/stable/docs/programming_languages.html) by GDScript, C#, and any language Godot supports
+* Terrains as small as 64x64m up to 65.5x65.5km (4295km^2) in non-contiguous and variable sized regions
+* Up to 32 textures
+* Up to 10 levels of detail for the terrain mesh
+* Foliage instancing, with up to 10 levels of detail, and a shadow impostor
+* Sculpting, holes, texture painting, texture detiling, painting colors and wetness
+* Imports heightmaps from [HTerrain](https://github.com/Zylann/godot_heightmap_plugin/), Gaea, World Creator, World Machine, Unity, Unreal and any tool that can export a heightmap. See [heightmaps](https://terrain3d.readthedocs.io/en/stable/docs/heightmaps.html)
+
+
+## Games Using Terrain3D
+
+Please see the [featured games using Terrain3D](https://terrain3d.readthedocs.io/en/latest/docs/games.html) for examples of what it can do.
+
+
+## Getting Started
+
+1. Read the [Introduction](https://terrain3d.readthedocs.io/en/stable/docs/introduction.html) to understand how this terrain system works.
+
+2. Read the [Installation & Upgrade](https://terrain3d.readthedocs.io/en/stable/docs/installation.html) instructions.
+
+3. Watch the [tutorial videos](https://terrain3d.readthedocs.io/en/stable/docs/tutorial_videos.html) and read through the documentation.
+
+4. For support, read [Getting Help](https://terrain3d.readthedocs.io/en/stable/docs/getting_help.html) and join our [Discord server](https://tokisan.com/discord).
+
+
+## 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 the contribution team in [AUTHORS.md](https://terrain3d.readthedocs.io/en/stable/docs/authors.html) and on the right of the github page.
+
+
+## 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/extras/3rd_party/import_sgt.gd

+# Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+# 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 region files.
+#
+# 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/3rd_party/import_sgt.gd.uid

+uid://bllcuwetve45k

addons/terrain_3d/extras/3rd_party/project_on_terrain3d.gd

+# Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+# 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 (select, press CTRL+K)
+# In the editor, add this modifier to Scatter, then set your Terrain3D node
+
+#@tool
+#extends "base_modifier.gd"
+#
+#
+#signal projection_completed
+#
+#
+#@export var terrain_node : NodePath
+#@export var align_with_collision_normal : bool = false
+#@export_range(0.0, 90.0, 0.1) var max_slope : float = 90.0
+#@export var enable_texture_filtering : bool = false
+#@export_range(0, 31) var target_texture_id : int = 0
+#@export var not_target_texture : bool = false
+#@export_range(0.0, 1.0, 0.01) var texture_threshold : float = 0.8
+#
+#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 modified version of `Project on Colliders` that queries Terrain3D
+		#for heights without using collision. It constrains placement by slope or texture.
+#
+		#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.")
+		#
+	#p = documentation.add_parameter("Enable Texture Filtering")
+	#p.set_type("bool")
+	#p.set_description(
+		#"If enabled, objects will only be placed based on the ground texture specified.")
+		#
+	#p = documentation.add_parameter("Target Texture ID")
+	#p.set_type("int")
+	#p.set_description(
+		#"The ID of the texture to place objects on (0-31). Objects will only be placed on this texture.")
+		#
+	#p = documentation.add_parameter("Not Target Texture")
+	#p.set_type("bool") 
+	#p.set_description(
+		#"If true, objects will be placed on all textures EXCEPT the target texture.")
+		#
+	#p = documentation.add_parameter("Texture Threshold")
+	#p.set_type("float") 
+	#p.set_description("The blend value required for placement on the texture.")
+#
+#
+#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.data:
+		#warning += """Terrain3DData is not initialized"""
+		#return
+#
+	## Review transforms
+	#var gt: Transform3D = domain.get_global_transform()
+	#var gt_inverse := gt.affine_inverse()
+	#var new_transforms_array: Array[Transform3D] = []
+	#var remapped_max_slope: float = remap(max_slope, 0.0, 90.0, 0.0, 1.0)
+	#for i in transforms.list.size():
+		#var t: Transform3D = transforms.list[i]
+		#
+		#var location: Vector3 = (gt * t).origin
+		#var height: float = _terrain.data.get_height(location)		
+		#if is_nan(height):
+			#continue
+		#
+		#var normal: Vector3 = _terrain.data.get_normal(location)
+		#if not abs(Vector3.UP.dot(normal)) >= (1.0 - remapped_max_slope):
+			#continue
+		#
+		#if enable_texture_filtering:
+			#var texture_info: Vector3 = _terrain.data.get_texture_id(location)
+			#var base_id: int = int(texture_info.x)
+			#var overlay_id: int = int(texture_info.y)
+			#var blend_value: float = texture_info.z
+			## Skip if overlay or blend != target texture, unless inverted
+			#if ((overlay_id != target_texture_id or blend_value < texture_threshold) and \
+				#(base_id != target_texture_id or blend_value >= texture_threshold)) != not_target_texture:
+					#continue
+#
+		#if align_with_collision_normal and not is_nan(normal.x):
+			#t.basis.y = normal
+			#t.basis.x = -t.basis.z.cross(normal)
+			#t.basis = t.basis.orthonormalized()
+#
+		#t.origin.y = height - gt.origin.y
+		#new_transforms_array.push_back(t)
+#
+	#transforms.list.clear()
+	#transforms.list.append_array(new_transforms_array)
+#
+	#if transforms.is_empty():
+		#warning += """All transforms have been removed. Possible reasons include: \n"""
+		#if enable_texture_filtering:
+			#warning += """+ No matching texture found at any position.
+			#+ Texture threshold may be too high.
+			#"""
+		#warning += """+ 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.
+		#"""

addons/terrain_3d/extras/3rd_party/project_on_terrain3d.gd.uid

+uid://g3opjh3m3iww

addons/terrain_3d/extras/particle_example/Terrain3DParticles.tscn

+[gd_scene load_steps=5 format=3 uid="uid://d3sr0a7dxfkr8"]
+
+[ext_resource type="Script" uid="uid://bp7r4ppgq1m0g" path="res://addons/terrain_3d/extras/particle_example/terrain_3D_particles.gd" id="1_gl3qg"]
+[ext_resource type="Material" uid="uid://el5y10hnh13g" path="res://addons/terrain_3d/extras/particle_example/process_material.tres" id="2_2gon1"]
+[ext_resource type="Material" uid="uid://ljo1wt61kbkq" path="res://addons/terrain_3d/extras/particle_example/grass_material.tres" id="3_qyjnw"]
+
+[sub_resource type="RibbonTrailMesh" id="RibbonTrailMesh_fwrtk"]
+shape = 0
+section_length = 0.18
+section_segments = 1
+
+[node name="Terrain3DParticles" type="Node3D"]
+script = ExtResource("1_gl3qg")
+instance_spacing = 0.25
+cell_width = 24.0
+grid_width = 5
+rows = 96
+amount = 9216
+process_material = ExtResource("2_2gon1")
+mesh = SubResource("RibbonTrailMesh_fwrtk")
+shadow_mode = 0
+mesh_material_override = ExtResource("3_qyjnw")
+min_draw_distance = 60.0
+particle_count = 230400
+metadata/_edit_lock_ = true

addons/terrain_3d/extras/particle_example/grass.gdshader

+// Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+
+shader_type spatial;
+
+render_mode skip_vertex_transform, cull_disabled, blend_mix;
+
+uniform vec2 wind_direction = vec2(1.0, 1.0);
+
+varying vec4 data;
+
+// A lot of hard coded things here atm.
+void vertex() {
+	// Wind effect from model data, in this case no vertex colors,
+	// so just use vertex Y component, including mesh offset
+	data[2] = (VERTEX.y + 0.55);
+	data[2] *= data[2]; // make non-linear
+
+	// Ribbon used as a grass mesh.. so pinch the top.
+	VERTEX.xz *= (1.0 - data[2]);
+
+	// Brighten tips
+	COLOR = mix(COLOR, vec4(1.0), smoothstep(0.9, 1.0, data[2]));
+	// Darken base, skip is scale is less than threshold, as this means "grow in" is occuring.
+	COLOR *= INSTANCE_CUSTOM[3] < 0.35 ? 1. : mix(1.0, 0.75, smoothstep(0.35, 0.0, data[2]));
+	// Save red/green shift for fragment
+	data.rg = INSTANCE_CUSTOM.rg;
+
+	// World space vertex
+	vec3 w_vertex = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+	// Get wind force and scale from process()
+	float scale = pow(INSTANCE_CUSTOM[3] * INSTANCE_CUSTOM[3], 0.707);
+	float force = INSTANCE_CUSTOM[2] * data[2] * scale;
+	// Add some cheap jitter at high wind values
+	force -= fract(force * 256.0) * force * 0.05;
+	// Curve the result
+	force = pow(force, 0.707);
+
+	// These 2 combined result in a decent bend without resorting to matrices or pivot data.
+	// Lateral move and wobble
+	float lateral_wobble = sin(TIME * 2.0 * (1.0 + data.r + data.g)) * 0.25 * (1.0 - INSTANCE_CUSTOM[2]);
+	vec2 direction = normalize(wind_direction);
+	w_vertex.xz -= (vec2(-direction.y, direction.x) * lateral_wobble + direction) * force;
+	// Flatten
+	w_vertex.y -= INSTANCE_CUSTOM[2] * force * data[2];
+
+	// Save final wind force value for fragment.
+	data[3] = force;
+
+	VERTEX = (VIEW_MATRIX * vec4(w_vertex, 1.0)).xyz;
+	NORMAL = MODELVIEW_NORMAL_MATRIX * NORMAL;
+	BINORMAL = MODELVIEW_NORMAL_MATRIX * BINORMAL;
+	TANGENT = MODELVIEW_NORMAL_MATRIX * TANGENT;
+}
+
+void fragment() {
+	// Hard coded color.
+	ALBEDO = vec3(0.20, 0.22, 0.05) * (data[2] * 0.5 + 0.5);
+	ALBEDO.rg *= (data.rg * 0.3 + 0.9);
+	ALBEDO *= pow(COLOR.rgb, vec3(2.2));
+	// Modify roughness / specular based on wind force for added detail
+	float spec_rough = clamp(max(data[2], data[3]), 0., 1.);
+	ROUGHNESS = 1. - spec_rough;
+	SPECULAR = clamp(spec_rough * 0.25, 0., .15);
+
+	BACKLIGHT = vec3(0.33);
+	#if CURRENT_RENDERER == RENDERER_COMPATIBILITY
+	ALBEDO = pow(ALBEDO, vec3(0.4));
+	#endif
+}

addons/terrain_3d/extras/particle_example/grass.gdshader.uid

+uid://dq3lfyp3u5oxt

addons/terrain_3d/extras/particle_example/grass_material.tres

+[gd_resource type="ShaderMaterial" load_steps=2 format=3 uid="uid://ljo1wt61kbkq"]
+
+[ext_resource type="Shader" uid="uid://dq3lfyp3u5oxt" path="res://addons/terrain_3d/extras/particle_example/grass.gdshader" id="1_nkru0"]
+
+[resource]
+render_priority = 0
+shader = ExtResource("1_nkru0")
+shader_parameter/wind_direction = Vector2(1, 1)

addons/terrain_3d/extras/particle_example/particles.gdshader.uid

+uid://dce675i014xcn

addons/terrain_3d/extras/particle_example/terrain_3D_particles.gd

+# Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+#
+# This is an example of using a particle shader with Terrain3D.
+# To use it, add `Terrain3DParticles.tscn` to your scene and assign the terrain.
+# Then customize the settings, materials and shader to extend it and make it your own.
+
+@tool
+extends Node3D
+
+
+#region settings
+## Auto set if attached as a child of a Terrain3D node
+@export var terrain: Terrain3D:
+	set(value):
+		terrain = value
+		_create_grid()
+
+
+## Distance between instances
+@export_range(0.125, 2.0, 0.015625) var instance_spacing: float = 0.5:
+	set(value):
+		instance_spacing = clamp(round(value * 64.0) * 0.015625, 0.125, 2.0)
+		rows = maxi(int(cell_width / instance_spacing), 1)
+		amount = rows * rows
+		_set_offsets()
+
+
+## Width of an individual cell of the grid
+@export_range(8.0, 256.0, 1.0) var cell_width: float = 32.0:
+	set(value):
+		cell_width = clamp(value, 8.0, 256.0)
+		rows = maxi(int(cell_width / instance_spacing), 1)
+		amount = rows * rows
+		min_draw_distance = 1.0
+		# Have to update aabb
+		if terrain and terrain.data:
+			var height_range: Vector2 = terrain.data.get_height_range()
+			var height: float = height_range[0] - height_range[1]
+			var aabb: AABB = AABB()
+			aabb.size = Vector3(cell_width, height, cell_width)
+			aabb.position = aabb.size * -0.5
+			aabb.position.y = height_range[1]
+			for p in particle_nodes:
+				p.custom_aabb = aabb
+		_set_offsets()
+
+
+## Grid width. Must be odd. 
+## Higher values cull slightly better, draw further out.
+@export_range(1, 15, 2) var grid_width: int = 9:
+	set(value):
+		grid_width = value
+		particle_count = 1
+		min_draw_distance = 1.0
+		_create_grid()
+
+
+@export_storage var rows: int = 1
+
+@export_storage var amount: int = 1:
+	set(value):
+		amount = value
+		particle_count = value
+		last_pos = Vector3.ZERO
+		for p in particle_nodes:
+			p.amount = amount
+
+
+@export_range(1, 256, 1) var process_fixed_fps: int = 30:
+	set(value):
+		process_fixed_fps = maxi(value, 1)
+		for p in particle_nodes:
+			p.fixed_fps = process_fixed_fps
+			p.preprocess = 1.0 / float(process_fixed_fps)
+
+
+## Access to process material parameters
+@export var process_material: ShaderMaterial
+
+## The mesh that each particle will render
+@export var mesh: Mesh
+
+@export var shadow_mode: GeometryInstance3D.ShadowCastingSetting = (
+		GeometryInstance3D.ShadowCastingSetting.SHADOW_CASTING_SETTING_ON):
+	set(value):
+		shadow_mode = value
+		for p in particle_nodes:
+			p.cast_shadow = value
+
+
+## Override material for the particle mesh
+@export_custom(
+	PROPERTY_HINT_RESOURCE_TYPE,
+	"BaseMaterial3D,ShaderMaterial") var mesh_material_override: Material:
+	set(value):
+		mesh_material_override = value
+		for p in particle_nodes:
+			p.material_override = mesh_material_override
+
+
+@export_group("Info")
+## The minimum distance that particles will be drawn upto
+## If using fade out effects like pixel alpha this is the limit to use.
+@export var min_draw_distance: float = 1.0:
+	set(value):
+		min_draw_distance = float(cell_width * grid_width) * 0.5
+
+
+## Displays current total particle count based on Cell Width and Instance Spacing
+@export var particle_count: int = 1:
+	set(value):
+		particle_count = amount * grid_width * grid_width
+
+#endregion
+
+
+var offsets: Array[Vector3]
+var last_pos: Vector3 = Vector3.ZERO
+var particle_nodes: Array[GPUParticles3D]
+
+
+func _ready() -> void:
+	if not terrain:
+		var parent: Node = get_parent()
+		if parent is Terrain3D:
+			terrain = parent
+	_create_grid()
+
+
+func _notification(what: int) -> void:
+	if what == NOTIFICATION_PREDELETE:
+		_destroy_grid()
+
+
+func _physics_process(delta: float) -> void:
+	if terrain:
+		var camera: Camera3D = terrain.get_camera()
+		if camera:
+			if last_pos.distance_squared_to(camera.global_position) > 1.0:
+				var pos: Vector3 = camera.global_position.snapped(Vector3.ONE)
+				_position_grid(pos)
+				RenderingServer.material_set_param(process_material.get_rid(), "camera_position", pos )
+				last_pos = camera.global_position
+		_update_process_parameters()
+	else:
+		set_physics_process(false)
+
+
+func _create_grid() -> void:
+	_destroy_grid()
+	if not terrain:
+		return
+	set_physics_process(true)
+	_set_offsets()
+	var hr: Vector2 = terrain.data.get_height_range()
+	var height: float = hr.x - hr.y
+	var aabb: AABB = AABB()
+	aabb.size = Vector3(cell_width, height, cell_width)
+	aabb.position = aabb.size * -0.5
+	aabb.position.y = hr.y
+	var half_grid: int = grid_width / 2
+	# Iterating the array like this allows identifying grid position, in case setting
+	# different mesh or materials is desired for LODs etc.
+	for x in range(-half_grid, half_grid + 1):
+		for z in range(-half_grid, half_grid + 1):
+			#var ring: int = maxi(maxi(absi(x), absi(z)), 0)
+			var particle_node = GPUParticles3D.new()
+			particle_node.lifetime = 600.0
+			particle_node.amount = amount
+			particle_node.explosiveness = 1.0
+			particle_node.amount_ratio = 1.0
+			particle_node.process_material = process_material
+			particle_node.draw_pass_1 = mesh
+			particle_node.speed_scale = 1.0
+			particle_node.custom_aabb = aabb
+			particle_node.cast_shadow = shadow_mode
+			particle_node.fixed_fps = process_fixed_fps
+			# This prevent minor grid alignment errors when the camera is moving very fast
+			particle_node.preprocess = 1.0 / float(process_fixed_fps)
+			if mesh_material_override:
+				particle_node.material_override = mesh_material_override
+			particle_node.use_fixed_seed = true
+			if (x > -half_grid and z > -half_grid): # Use the same seed across all nodes
+				particle_node.seed = particle_nodes[0].seed
+			self.add_child(particle_node)
+			particle_node.emitting = true
+			particle_nodes.push_back(particle_node)
+	last_pos = Vector3.ZERO
+
+
+func _set_offsets() -> void:
+	var half_grid: int = grid_width / 2
+	offsets.clear()
+	for x in range(-half_grid, half_grid + 1):
+		for z in range(-half_grid, half_grid + 1):
+			var offset := Vector3(
+				float(x * rows) * instance_spacing,
+				0.0,
+				float(z * rows) * instance_spacing
+			)
+			offsets.append(offset)
+
+
+func _destroy_grid() -> void:
+	for node: GPUParticles3D in particle_nodes:
+		if is_instance_valid(node):
+			node.queue_free()
+	particle_nodes.clear()
+
+
+func _position_grid(pos: Vector3) -> void:
+	for i in particle_nodes.size():
+		var node: GPUParticles3D = particle_nodes[i]
+		var snap = Vector3(pos.x, 0, pos.z).snapped(Vector3.ONE) + offsets[i]
+		node.global_position = (snap / instance_spacing).round() * instance_spacing
+		node.reset_physics_interpolation()
+		node.restart(true) # keep the same seed.
+
+
+func _update_process_parameters() -> void:
+	if process_material:
+		var process_rid: RID = process_material.get_rid()
+		if terrain and process_rid.is_valid():
+			RenderingServer.material_set_param(process_rid, "_background_mode", terrain.material.world_background)
+			RenderingServer.material_set_param(process_rid, "_vertex_spacing", terrain.vertex_spacing)
+			RenderingServer.material_set_param(process_rid, "_vertex_density", 1.0 / terrain.vertex_spacing)
+			RenderingServer.material_set_param(process_rid, "_region_size", terrain.region_size)
+			RenderingServer.material_set_param(process_rid, "_region_texel_size", 1.0 / terrain.region_size)
+			RenderingServer.material_set_param(process_rid, "_region_map_size", 32)
+			RenderingServer.material_set_param(process_rid, "_region_map", terrain.data.get_region_map())
+			RenderingServer.material_set_param(process_rid, "_region_locations", terrain.data.get_region_locations())
+			RenderingServer.material_set_param(process_rid, "_height_maps", terrain.data.get_height_maps_rid())
+			RenderingServer.material_set_param(process_rid, "_control_maps", terrain.data.get_control_maps_rid())
+			RenderingServer.material_set_param(process_rid, "_color_maps", terrain.data.get_color_maps_rid())
+			RenderingServer.material_set_param(process_rid, "instance_spacing", instance_spacing)
+			RenderingServer.material_set_param(process_rid, "instance_rows", rows)
+			RenderingServer.material_set_param(process_rid, "max_dist", min_draw_distance)

addons/terrain_3d/extras/particle_example/terrain_3D_particles.gd.uid

+uid://bp7r4ppgq1m0g

addons/terrain_3d/extras/shaders/hex_grid.gdshaderinc

+// Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+// This shader snippet draws a hex grid
+
+// To use it, add this line to the top of your shader:
+// #include "res://addons/terrain_3d/extras/shaders/hex_grid.gdshaderinc"
+
+// And this line at the bottom of your shader:
+// 	draw_hex_grid(uv2, _region_texel_size, w_normal, ALBEDO);
+
+mat2 rotate2d(float _angle) {
+	return mat2(vec2(cos(_angle),-sin(_angle)), vec2(sin(_angle), cos(_angle)));
+}
+
+void draw_hex_grid(vec2 uv, float texel_size, vec3 normal, inout vec3 albedo) {
+	float hex_size = 0.02;
+	float line_thickness = 0.04;
+
+	vec2 guv = (uv - vec2(0.5 * texel_size)) / hex_size;
+
+	// Convert UV to axial hex coordinates
+	float q = (sqrt(3.0) / 3.0 * guv.x - 1.0 / 3.0 * guv.y);
+	float r = (2.0 / 3.0 * guv.y);
+
+	// Cube coordinates for the hex (q, r, -q-r)
+	float x = q;
+	float z = r;
+	float y = -x - z;
+
+	// Round to the nearest hex center
+	vec3 rounded = round(vec3(x, y, z));
+	vec3 diff = abs(vec3(x, y, z) - rounded);
+
+	// Fix rounding errors
+	if (diff.x > diff.y && diff.x > diff.z) {
+		rounded.x = -rounded.y - rounded.z;
+	} else if (diff.y > diff.z) {
+		rounded.y = -rounded.x - rounded.z;
+	} else {
+		rounded.z = -rounded.x - rounded.y;
+	}
+
+	// Find the hex center in UV space
+	vec2 hex_center = vec2(
+	    sqrt(3.0) * rounded.x + sqrt(3.0) / 2.0 * rounded.z,
+	    3.0 / 2.0 * rounded.z
+    );
+
+	// Relative position within the hex
+	vec2 local_pos = guv - hex_center;
+	vec2 lines_uv = local_pos;
+	float line = 1.0;
+
+	for (int i = 0; i < 6; i++) {
+		vec2 luv = lines_uv * rotate2d(radians(60.0 * float(i) + 30.0));
+		float dist = abs(dot(luv + vec2(0.90), vec2(0.0, 1.0)));
+		line = min(line, dist);
+	}
+
+	// Filter lines by slope
+	float slope = 4.; // Can also assign to (auto_slope * 4.) to match grass placement
+	float slope_factor = clamp(dot(vec3(0., 1., 0.), slope * (normal - 1.) + 1.), 0., 1.);
+
+	// Draw hex grid
+	albedo = mix(albedo, vec3(1.0), smoothstep(line_thickness + 0.02, line_thickness, line) * slope_factor);
+	// Draw Hex center dot
+	albedo = mix(albedo, vec3(0.0, 0.5, 0.5), smoothstep(0.11, 0.10, length(local_pos)) * slope_factor);
+}
\ No newline at end of file

addons/terrain_3d/extras/shaders/hex_grid.gdshaderinc.uid

+uid://mri8pfoj2mfk

addons/terrain_3d/extras/shaders/lightweight.gdshader.uid

+uid://bbx2xhanpq5l3

addons/terrain_3d/extras/shaders/minimum.gdshader

+// Copyright © 2023-2026 Cory Petkovsek, Roope Palmroos, and Contributors.
+// 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,skip_vertex_transform;
+
+// Defined Constants
+#define SKIP_PASS 0
+#define VERTEX_PASS 1
+#define FRAGMENT_PASS 2
+
+#if CURRENT_RENDERER == RENDERER_COMPATIBILITY
+    #define fma(a, b, c) ((a) * (b) + (c))
+    #define dFdxCoarse(a) dFdx(a)
+    #define dFdyCoarse(a) dFdy(a)
+#endif
+
+// Private uniforms
+// Commented uniforms aren't needed for this shader, but are available for your own needs.
+uniform vec3 _camera_pos = vec3(0.f);
+uniform float _mesh_size = 48.f;
+uniform uint _background_mode = 1u; // NONE = 0, FLAT = 1, NOISE = 2
+uniform uint _mouse_layer = 0x80000000u; // Layer 32
+uniform float _vertex_spacing = 1.0;
+uniform float _vertex_density = 1.0; // = 1/_vertex_spacing
+uniform float _region_size = 1024.0;
+uniform float _region_texel_size = 0.0009765625; // = 1/1024
+uniform int _region_map_size = 32;
+uniform int _region_map[1024];
+//uniform vec2 _region_locations[1024];
+//uniform float _texture_uv_scale_array[32];
+//uniform float _texture_detile_array[32];
+//uniform vec4 _texture_color_array[32];
+uniform highp sampler2DArray _height_maps : repeat_disable;
+uniform highp sampler2DArray _control_maps : repeat_disable;
+//uniform highp sampler2DArray _color_maps : source_color, filter_linear_mipmap_anisotropic, repeat_disable;
+//uniform highp sampler2DArray _texture_array_albedo : source_color, filter_linear_mipmap_anisotropic, repeat_enable;
+//uniform highp sampler2DArray _texture_array_normal : hint_normal, filter_linear_mipmap_anisotropic, repeat_enable;
+
+// Public Uniforms
+uniform bool flat_terrain_normals = false;
+
+// Varyings & Types
+// Some are required for editor functions
+varying float v_vertex_xz_dist;
+varying vec3 v_vertex;
+
+////////////////////////
+// Vertex
+////////////////////////
+
+// Takes in world space XZ (UV) coordinates & search depth (only applicable for background mode none)
+// Returns ivec3 with:
+// XY: (0 to _region_size - 1) coordinates within a region
+// Z: layer index used for texturearrays, -1 if not in a region
+ivec3 get_index_coord(const vec2 uv, const int search) {
+	vec2 r_uv = round(uv);
+	vec2 o_uv = mod(r_uv,_region_size);
+	ivec2 pos;
+	int bounds, layer_index = -1;
+	for (int i = -1; i < clamp(search, SKIP_PASS, FRAGMENT_PASS); i++) {
+		if ((layer_index == -1 && _background_mode == 0u ) || i < 0) {
+			r_uv -= i == -1 ? vec2(0.0) : vec2(float(o_uv.x <= o_uv.y), float(o_uv.y <= o_uv.x));
+			pos = ivec2(floor((r_uv) * _region_texel_size)) + (_region_map_size / 2);
+			bounds = int(uint(pos.x | pos.y) < uint(_region_map_size));
+			layer_index = (_region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1);
+		}
+	}
+	return ivec3(ivec2(mod(r_uv,_region_size)), layer_index);
+}
+
+void vertex() {
+	// Get vertex of flat plane in world coordinates and set world UV
+	v_vertex = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+
+	// Camera distance to vertex on flat plane
+	v_vertex_xz_dist = length(v_vertex.xz - _camera_pos.xz);
+
+	// Geomorph vertex, set end and start for linear height interpolate
+	float scale = MODEL_MATRIX[0][0];
+	float vertex_lerp = smoothstep(0.55, 0.95, (v_vertex_xz_dist / scale - _mesh_size - 4.0) / (_mesh_size - 2.0));
+	vec2 v_fract = fract(VERTEX.xz * 0.5) * 2.0;
+	// For LOD0 morph from a regular grid to an alternating grid to align with LOD1+
+	vec2 shift = (scale < _vertex_spacing + 1e-6) ? // LOD0 or not
+		// Shift from regular to symetric
+		mix(v_fract, vec2(v_fract.x, -v_fract.y),
+			round(fract(round(mod(v_vertex.z * _vertex_density, 4.0)) *
+			round(mod(v_vertex.x * _vertex_density, 4.0)) * 0.25))
+			) :
+		// Symetric shift
+		v_fract * round((fract(v_vertex.xz * 0.25 / scale) - 0.5) * 4.0);
+	vec2 start_pos = v_vertex.xz * _vertex_density;
+	vec2 end_pos = (v_vertex.xz - shift * scale) * _vertex_density;
+	v_vertex.xz -= shift * scale * vertex_lerp;
+
+	// UV coordinates in world space. Values are 0 to _region_size within regions
+	UV = v_vertex.xz * _vertex_density;
+
+	// UV coordinates in region space + texel offset. Values are 0 to 1 within regions
+	UV2 = fma(UV, vec2(_region_texel_size), vec2(0.5 * _region_texel_size));
+
+	// Discard vertices for Holes. 1 lookup
+	ivec3 v_region = get_index_coord(start_pos, VERTEX_PASS);
+	uint control = floatBitsToUint(texelFetch(_control_maps, v_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 && v_region.z < 0))) {
+		v_vertex.x = 0. / 0.;
+	} else {
+		// Interpolate Geomorph Start & End, set height. 2 Lookups.
+		ivec3 uv_a = get_index_coord(start_pos, VERTEX_PASS);
+		ivec3 uv_b = get_index_coord(end_pos, VERTEX_PASS);
+		float h = mix(texelFetch(_height_maps, uv_a, 0).r, texelFetch(_height_maps, uv_b, 0).r, vertex_lerp);
+		v_vertex.y = h;
+	}
+
+	// Convert model space to view space w/ skip_vertex_transform render mode
+	VERTEX = (VIEW_MATRIX * vec4(v_vertex, 1.0)).xyz;
+	NORMAL = normalize((MODELVIEW_MATRIX * vec4(NORMAL, 0.0)).xyz);
+	BINORMAL = normalize((MODELVIEW_MATRIX * vec4(BINORMAL, 0.0)).xyz);
+	TANGENT = normalize((MODELVIEW_MATRIX * vec4(TANGENT, 0.0)).xyz);
+}
+
+////////////////////////
+// Fragment
+////////////////////////
+
+void fragment() {
+	// Recover UVs
+	vec2 uv = UV;
+	//vec2 uv2 = UV2;
+
+	// Lookup offsets, ID and blend weight
+	const vec3 offsets = vec3(0, 1, 2);
+	vec2 index_id = floor(uv);
+	vec2 weight = fract(uv);
+	vec2 invert = 1.0 - weight;
+	vec4 weights = vec4(
+		invert.x * weight.y, // 0
+		weight.x * weight.y, // 1
+		weight.x * invert.y, // 2
+		invert.x * invert.y  // 3
+	);
+
+	vec3 base_ddx = dFdxCoarse(v_vertex);
+	vec3 base_ddy = dFdyCoarse(v_vertex);
+	//vec4 base_derivatives = vec4(base_ddx.xz, base_ddy.xz);
+	// Calculate the effective mipmap for regionspace, and if less than 0,
+	// skip all extra lookups required for bilinear blend.
+	float region_mip = log2(max(length(base_ddx.xz), length(base_ddy.xz)) * _vertex_density);
+	bool bilerp = region_mip < 0.0;
+
+	ivec3 index[4];
+	// control map lookups, used for some normal lookups as well
+	index[0] = get_index_coord(index_id + offsets.xy, FRAGMENT_PASS);
+	index[1] = get_index_coord(index_id + offsets.yy, FRAGMENT_PASS);
+	index[2] = get_index_coord(index_id + offsets.yx, FRAGMENT_PASS);
+	index[3] = get_index_coord(index_id + offsets.xx, FRAGMENT_PASS);
+
+	// Terrain normals
+	vec3 index_normal[4];
+	float h[4];
+	// allows additional derivatives, eg world noise, brush previews etc
+	float u = 0.0;
+	float v = 0.0;
+
+	// Re-use index[] for the first lookups, skipping some math. 3 lookups
+	h[3] = texelFetch(_height_maps, index[3], 0).r; // 0 (0,0)
+	h[2] = texelFetch(_height_maps, index[2], 0).r; // 1 (1,0)
+	h[0] = texelFetch(_height_maps, index[0], 0).r; // 2 (0,1)
+	index_normal[3] = normalize(vec3(h[3] - h[2] + u, _vertex_spacing, h[3] - h[0] + v));
+
+	// Set flat world normal - overriden if bilerp is true
+	vec3 w_normal = index_normal[3];
+
+	// Branching smooth normals must be done seperatley for correct normals at all 4 index ids
+	if (bilerp) {
+		// 5 lookups
+		// Fetch the additional required height values for smooth normals
+		h[1] = texelFetch(_height_maps, index[1], 0).r; // 3 (1,1)
+		float h_4 = texelFetch(_height_maps, get_index_coord(index_id + offsets.yz, FRAGMENT_PASS), 0).r; // 4 (1,2)
+		float h_5 = texelFetch(_height_maps, get_index_coord(index_id + offsets.zy, FRAGMENT_PASS), 0).r; // 5 (2,1)
+		float h_6 = texelFetch(_height_maps, get_index_coord(index_id + offsets.zx, FRAGMENT_PASS), 0).r; // 6 (2,0)
+		float h_7 = texelFetch(_height_maps, get_index_coord(index_id + offsets.xz, FRAGMENT_PASS), 0).r; // 7 (0,2)
+
+		// Calculate the normal for the remaining index ids.
+		index_normal[0] = normalize(vec3(h[0] - h[1] + u, _vertex_spacing, h[0] - h_7 + v));
+		index_normal[1] = normalize(vec3(h[1] - h_5 + u, _vertex_spacing, h[1] - h_4 + v));
+		index_normal[2] = normalize(vec3(h[2] - h_6 + u, _vertex_spacing, h[2] - h[1] + v));
+
+		// Set interpolated world normal
+		w_normal =
+			index_normal[0] * weights[0] +
+			index_normal[1] * weights[1] +
+			index_normal[2] * weights[2] +
+			index_normal[3] * weights[3] ;
+	}
+
+	// Apply terrain normals
+	vec3 w_tangent = normalize(cross(w_normal, vec3(0.0, 0.0, 1.0)));
+	vec3 w_binormal = normalize(cross(w_normal, w_tangent));
+	NORMAL = mat3(VIEW_MATRIX) * w_normal;
+	TANGENT = mat3(VIEW_MATRIX) * w_tangent;
+	BINORMAL = mat3(VIEW_MATRIX) * w_binormal;
+
+	if (flat_terrain_normals) {
+		NORMAL = normalize(cross(dFdyCoarse(VERTEX),dFdxCoarse(VERTEX)));
+		TANGENT = normalize(cross(NORMAL, VIEW_MATRIX[2].xyz));
+		BINORMAL = normalize(cross(NORMAL, TANGENT));
+	}
+
+	// Apply PBR
+	ALBEDO = vec3(.2);
+	ROUGHNESS = .7;
+}

addons/terrain_3d/extras/shaders/minimum.gdshader.uid

+uid://01qauauvd8aa

addons/terrain_3d/icons/autoshader.svg

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