cam_pos      = [-0.757129, 1.09521, 0.262556]';
cam_dir      = [0.984212, -0.113935, 0.135442]';
cam_up       = [0.0992307, 0.988879, 0.11078]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.194921, 0.127136, -1.30948]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;