double area = t.area();
Vec origin_to_centroid = new Vec(new Point(0, 0, 0), t.centroid());
boolean facingAway = t.norm().dot(origin_to_centroid) > 0;
double area = t.area();
Vec origin_to_centroid = new Vec(new Point(0, 0, 0), t.centroid());
boolean facingAway = t.norm().dot(origin_to_centroid) > 0;