Updated rover level with asset. Also made the arrow fade when player is certain distance away

scripts/rover_game.gd

@@ -7,8 +7,11 @@ const LootTable = preload("res://scripts/loot_table.gd")
 const RockScene = preload("res://scenes/rock.tscn")
 
 onready var timer : Timer = $Timer
+onready var rover = $"%rover"
+onready var level_arrow = $"%LevelArrow"
 
 export var play_time: float = 20.0
+export var arrow_viz_distance = 10.0
 export (Array,Resource) var loot_items = []
 export (Array,int) var loot_weights = []
 
@@ -37,6 +40,10 @@ func _on_collection_area_area_entered(area):
 
 func _process(delta):
 	$"%progress_bar".value = timer.time_left * 100.0 / timer.wait_time
+	var dir_vec : Vector3 = level_arrow.transform.origin - rover.transform.origin
+	var distance = dir_vec.length() - arrow_viz_distance
+	var pct = 0.0 if distance < 0 else (distance / arrow_viz_distance)
+	level_arrow.get_active_material(0).set_shader_param("alpha", pct)
 
 func _on_Timer_timeout():
 	emit_signal("game_over")