cam_pos      = [0.0160765, 1.09476, 0.658228]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.567152, 0.596873, 0.567522]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0084675, 0.912202, -0.967841]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;