cam_pos      = [0.198296, 0.723437, -0.347144]';
cam_dir      = [0.910765, 0.142949, 0.387392]';
cam_up       = [-0.383643, -0.0540565, 0.921898]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.203124, 1.31438, -0.00745946]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;