Add cobbled limestone terrain

terrain/cobbled_limestone_albedo.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cs06oiwrord6t"
+path="res://.godot/imported/cobbled_limestone_albedo.png-cbafb40d3c6fc43ce00d68cb02456536.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/cobbled_limestone_albedo.png"
+dest_files=["res://.godot/imported/cobbled_limestone_albedo.png-cbafb40d3c6fc43ce00d68cb02456536.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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

terrain/cobbled_limestone_displacement.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://mkxbjfwdwkaq"
+path="res://.godot/imported/cobbled_limestone_displacement.png-8e8b27438ff815a9d58d4a490e04203c.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/cobbled_limestone_displacement.png"
+dest_files=["res://.godot/imported/cobbled_limestone_displacement.png-8e8b27438ff815a9d58d4a490e04203c.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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

terrain/cobbled_limestone_normal.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ukk0161x3eg2"
+path="res://.godot/imported/cobbled_limestone_normal.png-4d7b2eb9c070e06256eb42d408ff4a14.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/cobbled_limestone_normal.png"
+dest_files=["res://.godot/imported/cobbled_limestone_normal.png-4d7b2eb9c070e06256eb42d408ff4a14.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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

terrain/cobbled_limestone_roughness.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bcybapft8tl2x"
+path="res://.godot/imported/cobbled_limestone_roughness.png-f78cac7004d15ddc2a00fd10f74b8c10.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://terrain/cobbled_limestone_roughness.png"
+dest_files=["res://.godot/imported/cobbled_limestone_roughness.png-f78cac7004d15ddc2a00fd10f74b8c10.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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

terrain/terrain_instance_3d.gd

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+@tool
+class_name TerrainInstance3D extends GeometryInstance3D
+
+const _DETAIL := 2
+
+var _mesh := PlaneMesh.new()
+
+var _material := ShaderMaterial.new()
+
+##
+##
+##
+@export
+var size: Vector2i = Vector2i.ZERO:
+	get:
+		return size
+
+	set(value):
+		var width := maxi(value.x, 0)
+		var height := maxi(value.y, 0)
+
+		if (width != size.x) or (height != size.y):
+			if (width == 0) and (height == 0):
+				RenderingServer.instance_set_base(self.get_instance(), RID())
+
+			else:
+				self._mesh.subdivide_width = width * _DETAIL
+				self._mesh.subdivide_depth = height * _DETAIL
+				self._mesh.size = value
+
+				self._material.set_shader_parameter("SIZE", Vector2(value))
+				RenderingServer.instance_set_base(self.get_instance(), self._mesh)
+
+		size = value
+
+##
+##
+##
+@export
+var albedo_map: Texture2D = null:
+	get:
+		return albedo_map
+
+	set(value):
+		self._material.set_shader_parameter("ALBEDO_MAP_0", value)
+
+		albedo_map = value
+
+##
+##
+##
+@export
+var albedo_map_b: Texture2D = null:
+	get:
+		return albedo_map_b
+
+	set(value):
+		self._material.set_shader_parameter("ALBEDO_MAP_B", value)
+
+		albedo_map_b = value
+
+##
+##
+##
+@export
+var albedo_map_g: Texture2D = null:
+	get:
+		return albedo_map_g
+
+	set(value):
+		self._material.set_shader_parameter("ALBEDO_MAP_G", value)
+
+		albedo_map_g = value
+
+##
+##
+##
+@export
+var albedo_map_r: Texture2D = null:
+	get:
+		return albedo_map_r
+
+	set(value):
+		self._material.set_shader_parameter("ALBEDO_MAP_R", value)
+
+		albedo_map_r = value
+
+##
+##
+##
+@export
+var normal_map: Texture2D = null:
+	get:
+		return normal_map
+
+	set(value):
+		self._material.set_shader_parameter("NORMAL_MAP_0", value)
+
+		normal_map = value
+
+##
+##
+##
+@export
+var normal_map_b: Texture2D = null:
+	get:
+		return normal_map_b
+
+	set(value):
+		self._material.set_shader_parameter("NORMAL_MAP_B", value)
+
+		normal_map_b = value
+
+##
+##
+##
+@export
+var normal_map_g: Texture2D = null:
+	get:
+		return normal_map_g
+
+	set(value):
+		self._material.set_shader_parameter("NORMAL_MAP_G", value)
+
+		normal_map_g = value
+
+##
+##
+##
+@export
+var normal_map_r: Texture2D = null:
+	get:
+		return normal_map_r
+
+	set(value):
+		self._material.set_shader_parameter("NORMAL_MAP_R", value)
+
+		normal_map_r = value
+
+##
+##
+##
+@export
+var terrain_map: Texture2D = null:
+	get:
+		return terrain_map
+
+	set(value):
+		self._material.set_shader_parameter("TERRAIN_MAP", value)
+
+		terrain_map = value
+
+##
+##
+##
+@export
+var max_height := 100.0:
+	get:
+		return max_height
+
+	set(value):
+		self._material.set_shader_parameter("MAX_HEIGHT", value)
+
+		max_height = max(value, 0.0)
+
+func _init() -> void:
+	self._material.shader = preload("res://terrain_shader.gdshader")
+
+	self._mesh.surface_set_material(0, self._material)