cam_pos      = [-0.396139, 0.928158, 0.689828]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.812782, 0.312093, -0.491918]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0108684, 1.11481, 0.72524]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;