I've done ridge caps in the past using a second set of roof planes elevated by 1-1/2"; edited to form the caps. This works well for metal roofs, but does not work well for a shingled roof because of texture orientation.
These ridge caps are done with 3D polyline moldings adjusted to the ridge height. notice that there are two molding lines at each hip. This is necessary to control the miter at the end. This link further explains controling end miters on 3D molding polylines; http://chieftalk.com/showthread.php?...ter+3D+molding These molding are set to different layers to keep them from merging. I go to the roof DBX to get the Z values for the moldings.
I like this method because the texture orients correctly, and it's relatively easy.
I have used two moldings here, one for the common pitch at the ridge, and another for the pitch at the hips.