Implement more static constants for Vector3

include/J3ML/LinearAlgebra/Vector3.h

@@ -17,16 +17,66 @@ public:
 public:
     enum {Dimensions = 3};
 public:
+    /// Specifies a compile-time constant Vector3 with value (0,0,0).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Zero;
+    /// Specifies a compile-time constant Vector3 with value (1,1,1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
+    static const Vector3 One;
+    /// Specifies a compile-time constant Vector3 with value (0,1,0).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Up;
+    /// Specifies a compile-time constant Vector3 with value (0,-1,0).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Down;
+    /// Specifies a compile-time constant Vector3 with value (-1,0,0).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Left;
+    /// Specifies a compile-time constant Vector3 with value (1,0,0).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Right;
+    /// Specifies a compile-time constant Vector3 with value (0,0,-1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Forward;
+    /// Specifies a compile-time constant Vector3 with value (0,0,1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Backward;
+    /// Specifies a compile-time constant Vector3 with value (NAN, NAN, NAN).
+    /** For this constant, aeach element has the value of quet NaN, or Not-A-Number.
+        @note Never compare a Vector3 to this value! Due to how IEEE floats work, "nan == nan" returns false!
+        That is, nothing is equal to NaN, not even NaN itself!
+        @note Due to static data initialization order being undefined in C++, do NOT use this
+        member data to intialize other static data in other compilation units! */
     static const Vector3 NaN;
+    /// Specifies a compile-time constant Vector3 with value (+infinity, +infinity, +infinity).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 Infinity;
+    /// Specifies a compile-time constant Vector3 with value (-infinity, -infinity, -infinity).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
     static const Vector3 NegativeInfinity;
+    /// Specifies a compile-time constant Vector3 with value (1,1,1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
+    static const Vector3 UnitX;
+    /// Specifies a compile-time constant Vector3 with value (1,1,1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
+    static const Vector3 UnitY;
+    /// Specifies a compile-time constant Vector3 with value (1,1,1).
+    /** @note Due to static data initialization order being undefined in C++, do NOT use this
+        member to initialize other static data in other compilation units! */
+    static const Vector3 UnitZ;
+
 public:
 
     /// The default constructor does not initialize any members of this class.

src/J3ML/LinearAlgebra/Vector3.cpp

@@ -15,6 +15,9 @@ namespace J3ML::LinearAlgebra {
     const Vector3 Vector3::NaN      = {NAN, NAN, NAN};
     const Vector3 Vector3::Infinity = {INFINITY, INFINITY, INFINITY};
     const Vector3 Vector3::NegativeInfinity = {-INFINITY, -INFINITY, -INFINITY};
+    const Vector3 Vector3::UnitX = {1,0,0};
+    const Vector3 Vector3::UnitY = {0,1,0};
+    const Vector3 Vector3::UnitZ = {0,0,1};
 
     Vector3 Vector3::operator+(const Vector3& rhs) const
     {