cam_pos      = [0.355883, 1.88881, 0.494446]';
cam_dir      = [-0.0118272, -0.174467, 0.984592]';
cam_up       = [-0.501807, 0.852727, 0.145073]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.15032, 0.654837, 0.129853]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;