cam_pos      = [-0.217508, 0.916313, -0.32632]';
cam_dir      = [0.974824, 0.0470279, -0.21796]';
cam_up       = [0.220988, -0.0735331, 0.972501]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0395108, 1.32492, 0.109159]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;