ТЕМА: Экран затемняется не полностью[RMVXA]

def dispose_lights
    $game_map.lantern.dispose
    $game_map.light_sources.each { |source| source.dispose_light }
    $game_map.light_surface.bitmap.dispose
    $game_map.light_surface.dispose
    $game_map.light_surface = nil
  end
  def update_lights
    $game_map.light_surface.bitmap.clear
    $game_map.light_surface.bitmap.fill_rect(0,0,544,416,$game_map.effect_surface.color)
    $game_map.light_sources.each { |source| source.draw_light }
    return unless $game_map.lantern.visible
    @btr = $game_map.lantern.get_graphic
    x = $game_map.lantern.x
    y = $game_map.lantern.y
    r = $game_map.lantern.range
    sx = x + r
    sy = y + r
    dr = r*2
    $game_map.surfaces.each { |s| s.render_shadow(x,y,sx,sy,r,@btr) if s.visible?(sx,sy) && s.within?(x,x+dr,y,y+dr) }
    $game_map.light_surface.bitmap.blt($game_map.lantern.sx,$game_map.lantern.sy,@btr,Rect.new(0,0,dr,dr),$game_map.lantern.opacity)
  end
  def setup_lights
    @btr = nil
    $game_map.lantern.restore
    $game_map.light_sources.each { |source| source.restore_light }
    $game_map.light_surface = Sprite.new
    $game_map.light_surface.bitmap = Bitmap.new(544,416)
    $game_map.light_surface.bitmap.fill_rect(0,0,544,416,$game_map.effect_surface.color)
    $game_map.light_surface.blend_type = 2
    $game_map.light_surface.opacity = $game_map.effect_surface.alpha
    $game_map.light_surface.z = Surface_Z
  end