New to Zbrush, UV map problem

[system]

I used the default dog and divided to 510000 polygon, then I copied it and decimate it to 7000 polygon.

I proceed to make a UV map by unwrapping in UV master, all is well.

However, when I press copy uv, select the high polygon dog and paste uv, and flatten it again, the UV map totally changed as shown.

Am I doing anything wrong?

regards

Attachments

[beta_channel]

you can’t copy UVs from one mesh to another unless they have the exact same topology and vertex winding order.

You need to duplicate your mesh
use Zremesher
unwrap your new mesh.
subD your mesh back up and project your mesh.

All done.

[system]

Thanks!