Its my calc. correct?
struct quad_vect{
double x;
double y;
double z;
};quad_vect normalize(quad_vect vert)
{
float len;
quad_vect norm;
len=sqrt(pow(vert.x,2)+pow(vert.y,2)+pow(vert.z,2));
norm=vert;
if(len>0) {
norm.x/=len;
norm.y/=len;
norm.z/=len;
}
return norm;
}quad_vect normal(quad_vect vert_1,quad_vect vert_2)
{
quad_vect norm;
norm.x=(vert_1.yvert_2.z)-(vert_2.yvert_1.z);
norm.y=(vert_1.zvert_2.x)-(vert_2.zvert_1.x);
norm.z=(vert_1.xvert_2.y)-(vert_2.xvert_1.y);
return normalize(norm);
}