How can you rotate a procedural material? I'm modeling our church sanctuary to assist in a lighting design and I am reusing a procedural wood material from the wood pews to kind of simulate the laminated beams that hold up the roof, but those beams are vertical, not horizontal like the pews.

I've tried just adjusting rotation in the vector transforms, and I've tried switching the scaling to favor the z-axis rather than the x-axis.  Neither attempt has worked.

(This procedural wood is courtesy of an old thread on blenderartists.org)



The horizontally striped beam is the test beam (on the right, in the light)
Following @gandalf3's suggestion above, I switched to having my values affect the texture, restarted all values from scale of 1 and rotation of 0, and then started playing with them until I got something that's sort of acceptable.  It really helped to partition my screen so the node editor was large but above it was the 3D View wherein I had isolated my beam (Numpad /) and had the 3D View set for "Rendered view" That allowed me to see the effect of my changes quite quickly.