Using explicit constructors for templated type in Vector.

E.g. T() instead of 0, T(1) instead of 1. Added just-to-be-sure unit
test.

src/Math/Test/Vector3Test.cpp

@@ -41,6 +41,12 @@ void Vector3Test::cross() {
     QVERIFY(Vector3::cross(a, b) == Vector3(-10, -3, 7));
 }
 
+void Vector3Test::axis() {
+    QVERIFY(Vector3::xAxis(5.0f) == Vector3(5.0f, 0.0f, 0.0f));
+    QVERIFY(Vector3::yAxis(6.0f) == Vector3(0.0f, 6.0f, 0.0f));
+    QVERIFY(Vector3::zAxis(7.0f) == Vector3(0.0f, 0.0f, 7.0f));
+}
+
 void Vector3Test::debug() {
     ostringstream o;
     Debug(&o) << Vector3(0.5f, 15.0f, 1.0f);

src/Math/Test/Vector3Test.h

@@ -25,6 +25,7 @@ class Vector3Test: public QObject {
     private slots:
         void construct();
         void cross();
+        void axis();
 
         void debug();
 };

src/Math/Vector3.h

@@ -37,13 +37,13 @@ template<class T> class Vector3: public Vector<T, 3> {
         }
 
         /** @brief Vector in direction of X axis */
-        inline constexpr static Vector3<T> xAxis(T length = 1) { return Vector3<T>(length, 0, 0); }
+        inline constexpr static Vector3<T> xAxis(T length = T(1)) { return Vector3<T>(length, T(), T()); }
 
         /** @brief Vector in direction of Y axis */
-        inline constexpr static Vector3<T> yAxis(T length = 1) { return Vector3<T>(0, length, 0); }
+        inline constexpr static Vector3<T> yAxis(T length = T(1)) { return Vector3<T>(T(), length, T()); }
 
         /** @brief Vector in direction of Z axis */
-        inline constexpr static Vector3<T> zAxis(T length = 1) { return Vector3<T>(0, 0, length); }
+        inline constexpr static Vector3<T> zAxis(T length = T(1)) { return Vector3<T>(T(), T(), length); }
 
         /** @brief Cross product */
         constexpr static Vector3<T> cross(const Vector3<T>& a, const Vector3<T>& b) {