cam_pos      = [0.271364, 1.30458, 0.364979]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.735112, 0.646167, -0.205132]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.461287, 0.822515, 0.937861]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;