cam_pos      = [-0.764306, 1.33185, 0.0197802]';
cam_dir      = [0.336967, 0.146881, 0.929989]';
cam_up       = [0.543221, 0.776439, -0.319457]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.02277, -0.815072, -0.241855]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;