ZBrushCentral

Creating tileable normal maps

Hi Guys

Just wondering if anyone could help. I have a tileable texture i have created in photoshop and i need to create a normal map for it. I was hoping to use zbrush to sculpt the height map. How do i go about setting it so i can sculpt a normal and it still remain tileable at the edges. Cheers Luke

This is the texture i want to sculpt a normal map too.
SmoothRock_CM.jpg