cam_pos      = [0.212311, 0.642511, -0.3275]';
cam_dir      = [0.873023, 0.300256, 0.384288]';
cam_up       = [-0.471997, 0.322003, 0.82069]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.163158, 1.19416, -0.562373]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;