This is for C Programming, using the getNormal function.

Part #11-getNormal Calculate the normal vector to a plane based on three input points, where x is the cross product between the two vectors where x represents the cross product, and For example, if we have three points such that P (1,-2,0), Q (3,1,4) and R (0,-1,2), then the normal vector is =[234] PR=[-1 1 2]