cam_pos      = [-0.45183, 1.10457, 1.03802]';
cam_dir      = [0.891734, 0.0229019, -0.45198]';
cam_up       = [-0.121082, 0.974383, -0.189516]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.579962, -0.297553, -1.15931]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;