hm. whenever I run into problems I usually create a new scene for experimenting. important is to keep it as simple as possible.


create a simple sphere and grab both vertices on opposite sides. when your geometry is flipped over the X- axis you can now translate them together in Y and Z. do not translate in X cause then you have nor mirrored geometry anymore. you can scale them up and down to have your verts moved along the X axis.

other thing you can do is cut your sphere in half by selecting the middle isoparms and click Edit Nurbs > Detach Surfaces. select your half geometry and open duplicate option box. check Instance and put (-1) into sclae axis you want to mirror your geometry. this creates a instance of your half sphere which behaves exactly like the original one just in a mirrored manner. this way you just need to select vertex on orig_sphere and the vert on the 2nd one moves with it.

but keep in mind if you want to attach them or do some specific operations like merge vertex, polyUnite (polygon modeling) which affects one side the instanced side usually vanishes and leaves blindnodes behind. thats cause it is no individual object, but an instanced one.


hope that helped you out a bit.

kind regards!