added static cross product; tests

UGameEngine/utils/vectorxd.h

     VectorXD<X>& div(double k);
 
     double dotProduct(const VectorXD<X>& other) const;
+
     VectorXD<X>& crossProduct(const VectorXD<X>& other);
+    static VectorXD<X> crossProduct(const VectorXD<X> &v1, const VectorXD<X> &v2);
 
     double norm() const;
 

UGameEngine/utils/vectorxd.hxx

     return *this;
 }
 
+tmpl VectorXD<X> VectorXD<X>::crossProduct(const VectorXD<X> &v1, const VectorXD<X> &v2)
+{
+    return VectorXD<X>(v1).crossProduct(v2);
+}
+
 tmpl double VectorXD<X>::norm() const
 {
     double total = 0;

tests/testvector3d.cpp

 
     void crossProduct1();
     void crossProduct2();
+    void crossProduct3();
 
     void norm1();
     void norm2();
     QCOMPARE(v.getZ(), -310.0);
 }
 
+void TestVector3D::crossProduct3()
+{
+    Vector3D v1(10.0, 24.0, 8.0);
+    Vector3D v2(15.0, 5.0, 0.0);
+    Vector3D v = Vector3D::crossProduct(v1, v2);
+    QCOMPARE(v.getX(), -40.0);
+    QCOMPARE(v.getY(), 120.0);
+    QCOMPARE(v.getZ(), -310.0);
+}
+
 void TestVector3D::norm1()
 {
     Vector3D v(3.0, 4.0, 0.0);;