cam_pos      = [0.381472, 1.82472, 0.83025]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.337074, 0.488893, -0.80459]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.14538, 1.10191, 0.730456]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;