Material Orientation Method

Hello,

Attached you can find the model I am working on. It is 3d tetra meshed, after meshing i intend to apply material orientation. But i have some doubts, I select the material orientation as by vector, i wanted to know what coordinates should i define for N1,N2,N3 and base so that it will define the material orientation in 0,45 and 90 degrees or how do the coordinates of N1,N2,N3 work for any defined angle.

Thanks in advance

Amey

<?xml version="1.0" encoding="UTF-8"?>