2 files changed, 16 insertions, 0 deletions
diff --git a/src/vec4ops/transform4d.cpp b/src/vec4ops/transform4d.cpp
index 5cc51f3..66ca8e3 100644
--- a/src/vec4ops/transform4d.cpp
+++ b/src/vec4ops/transform4d.cpp
@@ -15,4 +15,16 @@ glm::vec4 Vec4Ops::inverseTransformPoint4(glm::vec4 point4,  glm::mat4 inverseTr
     point4 += inverseTranslationPointVector;
     point4 = inverseTranslationPointVector * point4;
     return point4;
+}
+
+glm::vec4 Vec4Ops::transformDir4(glm::vec4 dir4, glm::mat4 transformDirectionMatrix) {
+    // do the direction
+    dir4 = transformDirectionMatrix * dir4;
+    return dir4;
+}
+
+glm::vec4 Vec4Ops::inverseTransformDir4(glm::vec4 dir4, glm::mat4 inverseTransformDirectionMatrix) {
+    // do the direction
+    dir4 = inverseTransformDirectionMatrix * dir4;
+    return dir4;
 }
 \ No newline at end of file
diff --git a/src/vec4ops/vec4ops.h b/src/vec4ops/vec4ops.h
index d1c3ac8..f48dcff 100644
--- a/src/vec4ops/vec4ops.h
+++ b/src/vec4ops/vec4ops.h
@@ -32,6 +32,10 @@ public:
     static glm::vec4 dot4(glm::vec4 u, glm::vec4 v);
 
     static glm::mat4 getViewMatrix4(glm::vec4 fromPoint, glm::vec4 toPoint, glm::vec4 upVector, glm::vec4 lookVector);
+
+    static glm::vec4 transformDir4(glm::vec4 dir4, glm::mat4 transformDirectionMatrix);
+
+    glm::vec4 inverseTransformDir4(glm::vec4 dir4, glm::mat4 inverseTransformDirectionMatrix);
 };
 
 #endif //PROJECTS_RAY_VEC4OPS_H