cam_pos      = [0.466262, 1.5237, 0.238604]';
cam_dir      = [-0.936426, -0.3419, -0.0788023]';
cam_up       = [-0.290744, 0.881867, -0.371186]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.261215, 0.43182, 1.23053]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;