every time that i copy an object and then scale it in -1, the object is reversing his normals and become black,then i need to reverse the normals of the object.
if i do this to a group i need to revese all the objects of the group, one by one ,and cant do reverse to all the group at once.
1. is there a way to flip the object without reverse his nomals?
2.how can i reverse the normals of all the group in one action, and not piece by piece?