planenormvec

VEC = PLANENORMVEC(PT1,PT2,PT3) calculats the normal vector of a plane that includes three points PT1, PT2, and PT3. When the plane is expressed as ax + by + cz = 1, VEC(1) = a, VEC(2) = b, VEC(3) = c. Points should be a 1 x 3 vector, specifying x, y and z values for each column.
(Example)
p1 = [3,4,5];
p2 = [8,-4,0];
p3 = [0,0,1];
vec = planenormvec(p1,p2,p3);