I just wanted to see how far maybe I could use Cycles to make some procedural woods but the empty as a object texturing input does not work anymore. So you cannot rotate the mesh via the object coordinates in Cycles.
However via moving the wood ring center around you can get similar good looks.
The nodes are not too complicated and quite flexible to use. You have full control over grain pores and colors
by only using the wave and noise texture.
This is a basic set - so you need to adjust values like bump texture scale etc to your scene.
This file is free and a thank you to the community feel free to use it for private or commercial work.