diff --git a/include/light/phong.hh b/include/light/phong.hh
index 9c9aa360..983b26bb 100644
--- a/include/light/phong.hh
+++ b/include/light/phong.hh
@@ -46,6 +46,7 @@ const bsp2_dface_t *Face_EdgeIndexSmoothed(const mbsp_t *bsp, const bsp2_dface_t
 /// a directed edge can be used by more than one face, e.g. two cube touching just along an edge
 using edgeToFaceMap_t = std::map<std::pair<int,int>, std::vector<const bsp2_dface_t *>>;
 
+std::vector<const bsp2_dface_t *> FacesUsingVert(int vertnum);
 const edgeToFaceMap_t &GetEdgeToFaceMap();
 
 class face_cache_t {
diff --git a/light/phong.cc b/light/phong.cc
index 2c848b22..7a97556d 100644
--- a/light/phong.cc
+++ b/light/phong.cc
@@ -76,6 +76,16 @@ static map<int, vector<const bsp2_dface_t *>> planesToFaces;
 static edgeToFaceMap_t EdgeToFaceMap;
 static vector<face_cache_t> FaceCache;
 
+vector<const bsp2_dface_t *> FacesUsingVert(int vertnum)
+{
+    const auto &vertsToFaces_const = vertsToFaces;
+    
+    auto it = vertsToFaces_const.find(vertnum);
+    if (it != vertsToFaces_const.end())
+        return it->second;
+    return {};
+}
+
 const edgeToFaceMap_t &GetEdgeToFaceMap()
 {
     Q_assert(s_builtPhongCaches);