curved surface that tiled hexagon (after this, Unrollsrf in rhino)

hi, every one;) i have problem in grasshopper and Rhinoceros. 

 i have curved surface like this photo,

i want to draw hexagonal grid along curved surface.

(it hexagon may be euclidean geometry..)

and after this, i will 'Unrollsrf' this surface in Rhinoceros to get development chart.

i think i will using it for make architectural model.

Thanks in advance.

(i think my English is strange...so you feel difficult to understanding my question. )