public void recalc_normals()
{
// normal data from STL files is usually junk, so recalculate:
Vector v1 = new Vector(p[0].x - p[1].x, p[0].y - p[1].y, p[0].z - p[1].z);
Vector v2 = new Vector(p[0].x - p[2].x, p[0].y - p[2].y, p[0].z- p[2].z);
n = v1.Cross(v2); // the normal is in the direction of the cross product between the edge vectors
n = (1 / n.Length()) * n; // normalize to length==1
}
public Tri(Point P1, Point P2, Point P3)
{
p = new Point[3];
bb = new Bbox();
p[0] = P1;
p[1] = P2;
p[2] = P3;
// if normal is not given, calculate it here.
Vector v1 = new Vector(p[0].x - p[1].x, p[0].y - p[1].y, p[0].z - p[1].z);
Vector v2 = new Vector(p[0].x - p[2].x, p[0].y - p[2].y, p[0].z- p[2].z);
n = v1.Cross(v2); // the normal is in the direction of the cross product between the edge vectors
n = (1 / n.Length()) * n; // normalize to length==1
}