diff --git a/Source/Core/Common/Matrix.cpp b/Source/Core/Common/Matrix.cpp
index 9581a5a4ce..6ccfbe459c 100644
--- a/Source/Core/Common/Matrix.cpp
+++ b/Source/Core/Common/Matrix.cpp
@@ -45,6 +45,22 @@ Matrix33 Matrix33::Identity()
   return mtx;
 }
 
+Matrix33 Matrix33::FromQuaternion(float qx, float qy, float qz, float qw)
+{
+  // Normalize.
+  const float n = 1.0f / sqrt(qx * qx + qy * qy + qz * qz + qw * qw);
+  qx *= n;
+  qy *= n;
+  qz *= n;
+  qw *= n;
+
+  return {
+      1 - 2 * qy * qy - 2 * qz * qz, 2 * qx * qy - 2 * qz * qw,     2 * qx * qz + 2 * qy * qw,
+      2 * qx * qy + 2 * qz * qw,     1 - 2 * qx * qx - 2 * qz * qz, 2 * qy * qz - 2 * qx * qw,
+      2 * qx * qz - 2 * qy * qw,     2 * qy * qz + 2 * qx * qw,     1 - 2 * qx * qx - 2 * qy * qy,
+  };
+}
+
 Matrix33 Matrix33::RotateX(float rad)
 {
   const float s = std::sin(rad);
diff --git a/Source/Core/Common/Matrix.h b/Source/Core/Common/Matrix.h
index ed58abdccb..b0ec811545 100644
--- a/Source/Core/Common/Matrix.h
+++ b/Source/Core/Common/Matrix.h
@@ -273,6 +273,7 @@ class Matrix33
 {
 public:
   static Matrix33 Identity();
+  static Matrix33 FromQuaternion(float x, float y, float z, float w);
 
   // Return a rotation matrix around the x,y,z axis
   static Matrix33 RotateX(float rad);