I'm confused - you are showing a curved surface where the wood grain follows the contours, more-or-less, and seem to be unhappy with it. Is this supposed to be "Bent wood?"
At any rate, there's no solution to controlling the texture map against a non-rectilinear surface in Archicad - you takes what you gets, eh?
There's a GDL command where mapping direction can be controlled, but there is no command to address curved, bulging surfaces.
My advice is to apply a texture without obvious direction and accept the limits of Archicad mapping.
Dwight Atkinson