diff --git a/terrain/terrain_instance_3d.gd b/terrain/terrain_instance_3d.gd
index f844714..62c65fa 100644
--- a/terrain/terrain_instance_3d.gd
+++ b/terrain/terrain_instance_3d.gd
@@ -15,13 +15,13 @@ enum PaintSlot {
 	PAINT_3,
 }
 
-var _albedo_maps: Array[Texture2D] = [null, null, null, null]
+var _albedo_maps: Array[Texture2D] = []
 
 var _material := ShaderMaterial.new()
 
 var _mesh := PlaneMesh.new()
 
-var _normal_maps: Array[Texture2D] = [null, null, null, null]
+var _normal_maps: Array[Texture2D] = []
 
 ##
 ## Range of the height channel value, ranging from [code]0.0[/code] to [code]100.0[/code].
@@ -54,6 +54,11 @@ var size := Vector2i.ONE:
 		size = value
 
 func _init() -> void:
+	var paint_channels := PaintSlot.values().size()
+
+	_albedo_maps.resize(paint_channels)
+	_normal_maps.resize(paint_channels)
+
 	_material.shader = _SHADER
 
 	_mesh.surface_set_material(0, _material)