Plot a plane from 3 points

It plots a plane from 3 points. Its returns all the coeff of plane (a, b, c,d)

[normal, d] = plot_line(p1, p2, p3)

where, p1 = [x y z] similliarly all other points are passed in the same pattern.

If the eq of plane is assumed to be:
ax + by + cz = d;

This function takes 3 points as input ans return [a b c] and d