def METHOD_NAME(self):
    # Set any drops at final frame back to 0 and remove color data
    finished_drops = self.drop_frames >= self.n_frames - 1
    self.drop_frames[finished_drops] = 0
    self.drop_colors[:, finished_drops] = 0
    # Add one to any running frames
    self.drop_frames[self.drop_frames > 0] += 1