Fix TerrainInstance size limits

project.godot

@@ -53,6 +53,15 @@ window/size/viewport_height=800
 window/stretch/mode="canvas_items"
 window/stretch/aspect="keep_height"
 
+[editor]
+
+version_control/plugin_name="GitPlugin"
+version_control/autoload_on_startup=true
+
+[editor_plugins]
+
+enabled=PackedStringArray()
+
 [input]
 
 player_controller_left={

terrain_instance_3d.gd

@@ -1,6 +1,8 @@
 @tool
 class_name TerrainInstance3D extends GeometryInstance3D
 
+const _TERRAIN_MAX := 1024
+
 var _mesh := PlaneMesh.new()
 
 var _material := ShaderMaterial.new()
@@ -14,18 +16,22 @@ var size: Vector2i = Vector2i.ZERO:
 		return size
 
 	set(value):
-		var width := value.x
-		var height := value.y
+		var width := clampi(value.x, 0, _TERRAIN_MAX)
+		var height := clampi(value.y, 0, _TERRAIN_MAX)
 
-		if (width != 0) and (height != 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
 				self._mesh.subdivide_depth = height
 				self._mesh.size = value
 
 				self._material.set_shader_parameter("SIZE", Vector2(value))
+				RenderingServer.instance_set_base(self.get_instance(), self._mesh)
 
-		size = value
+		size = Vector2i(width, height)
 
 ##
 ##
@@ -161,4 +167,3 @@ func _init() -> void:
 	self._material.shader = preload("res://terrain_shader.gdshader")
 
 	self._mesh.surface_set_material(0, self._material)
-	RenderingServer.instance_set_base(self.get_instance(), self._mesh)