The normals are not used in poser at all, even if they exist. Other apps may use this info it it is available. Poser decides the normal by the order in which the vertices are defined. Take the points and define them starting at one point and working around it. Now look at the polygon so that the points were defined in a clockwise order. The normal will be facing in this direction. So in order to change normals in poser you have to be sure you define the polygons in a clockwise manner when looking at them from the outside. Many apps do this but some fail and use the VN lines to actually define it.