Curvy plastering

[Marcthur]

I am creating a 3D model of a cottage and would like plastering with curved lines on the walls.
I model in a 3D package and use PS only for the 2D texture.
How would I approach making this texture in PS.
I can start with a plaster texture but have no clear idea how to make the curved effects on it.
It has to have the same rustic effect as in the picture.
The texture may be approx 1024x256 pixels.

Thanks for any tips or ideas.

 

[IamSam]

Ok, just to avoid some confusion, are you using a 3D modeling program in conjunction with a texture created in Photoshop, Photoshop's 3D engine, or are you just drawing a 3D representation of the Cottage in Photoshop?