cam_pos      = [0.108845, 1.52071, 1.57881]';
cam_dir      = [-0.997989, -0.00992135, -0.0625982]';
cam_up       = [0.0326414, 0.766156, -0.641825]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.072256, 0.854629, 1.01651]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;