cam_pos      = [-0.953778, 1.62714, 1.22561]';
cam_dir      = [0.945778, 0.0829355, 0.314048]';
cam_up       = [0.0457262, 0.923229, -0.381519]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.427701, -0.499007, -1.15627]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;