cam_pos      = [0.182848, 1.03171, 0.662714]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.788317, 0.0262569, -0.614708]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.311386, -1.2118, -0.451091]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;