Angled Height Maps

I'm a newcomer to Filter Forge as regards designing filters, but since I couldn't find vinyl siding filters that I like, I decided to make my own, and submit it ... I probably did everything wrong, but that's another story. I made a filter that used Perlin noise to create height. Now I'd like to create a couple of siding textures that are at 90 degrees to my originals, but when I turn the noise through 90 degrees, it loses all height attributes. Is this something that I should expect ... if so can someone explain why it happens so that I can learn something. How would I create a vertically oriented wood grain like texture to give it height?

Ahh, thank you. So new and foolish that I didn't think about using the lighting tab in the filter creation ... back to the drawing board!