Seamless paint in real time

[petrnita]

I know that a few times he was mentioned about it in the forum.
I believe, however, that the solution proposed in the answers is not sufficient.
It would be a great opportunity to paint seamlessly in real time, giving you full control over the work.
After painting the mirror image it is also possible, and the same effect can be achieved by copying and rotating layers but it is in Art Rage option of painting the mirror image.