cam_pos      = [0.635299, 1.44901, 1.24117]';
cam_dir      = [-0.203854, -0.0929338, 0.97458]';
cam_up       = [-0.0413492, 0.995413, 0.0862713]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.30091, 0.0302062, 0.274993]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;