cam_pos      = [0.0483318, 1.16536, -0.701136]';
cam_dir      = [-0.837274, -0.347251, 0.422361]';
cam_up       = [-0.300116, 0.937548, 0.175882]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.607888, -0.0272706, 1.18264]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;