Fully Procedural Wood With Variable Shader, Blender 3D

I set myself an ambitious task - to create a dynamic model of a wooden surface that could be used in 3D rendering. I enjoyed the process and I think it worked out well. Vector algebra and the new Blender shading toolkit helped. First, drove around the city, photographed wooden surfaces, then sat down at a PC and tried to model them. The result is in front of you. This has already been done before me, but the peculiarity of this texture is that each new board acquires differences in the structure of the fibers and a variation in the color of the wood. Please note that as a result, there are no pictures of the textures behind this, i.e. what you see is pure mathematics.