diff --git a/include/zeus/CMatrix3f.hpp b/include/zeus/CMatrix3f.hpp
index 5034d73..682decc 100644
--- a/include/zeus/CMatrix3f.hpp
+++ b/include/zeus/CMatrix3f.hpp
@@ -211,6 +211,14 @@ public:
                          TVectorUnion{0.f, 0.f, 1.f, 0.f});
     }
 
+    float determinant() const
+    {
+        return
+        m[1][0] * (m[2][1] * m[0][2] - m[0][1] * m[2][2]) +
+        m[0][0] * (m[1][1] * m[2][2] - m[2][1] * m[1][2]) +
+        m[2][0] * (m[0][1] * m[1][2] - m[1][1] * m[0][2]);
+    }
+
     union {
         float m[3][4]; /* 4th row for union-alignment */
         struct
diff --git a/include/zeus/CQuaternion.hpp b/include/zeus/CQuaternion.hpp
index 09e0423..0d21d00 100644
--- a/include/zeus/CQuaternion.hpp
+++ b/include/zeus/CQuaternion.hpp
@@ -268,6 +268,9 @@ public:
 
     CQuaternion buildEquivalent() const;
 
+    zeus::CVector3f getImaginary() const { return {x, y, z}; }
+    void setImaginary(const zeus::CVector3f& i) { x = i.x; y = i.y; z = i.z; }
+
     inline float& operator[](size_t idx) { return (&w)[idx]; }
     inline const float& operator[](size_t idx) const { return (&w)[idx]; }