diff --git a/rogueviz/collatz.cpp b/rogueviz/collatz.cpp
index a62388d2..930c0b7d 100644
--- a/rogueviz/collatz.cpp
+++ b/rogueviz/collatz.cpp
@@ -11,14 +11,12 @@ namespace collatz {
   
   edgetype *collatz1, *collatz2;
   
-  int collatz_id;
-  
   void act(vertexdata& vd, cell *c, shmup::monster *m, int i);
   void lookup(long long reached, int bits);
   void collatz_video(const string &fname);
 
   void start() {
-    init(&collatz_id, RV_GRAPH);
+    init(RV_GRAPH);
     collatz1 = add_edgetype("1");
     collatz2 = add_edgetype("2");
     vdata.resize(1);
diff --git a/rogueviz/flocking.cpp b/rogueviz/flocking.cpp
index 0bb1dd35..f2de1db4 100644
--- a/rogueviz/flocking.cpp
+++ b/rogueviz/flocking.cpp
@@ -48,8 +48,6 @@ namespace flocking {
 
   void init();
 
-  int flock_id;
-
   int N;
   
   bool draw_lines = false;
@@ -464,7 +462,7 @@ namespace flocking {
       return;
       }
     stop_game();
-    rogueviz::init(&flock_id, RV_GRAPH);
+    rogueviz::init(RV_GRAPH);
     rv_hook(shmup::hooks_turn, 100, turn);
     rv_hook(hooks_frame, 100, flock_marker);
     rv_hook(hooks_o_key, 80, o_key);
diff --git a/rogueviz/fullnet.cpp b/rogueviz/fullnet.cpp
index 4a5a369c..be12de31 100644
--- a/rogueviz/fullnet.cpp
+++ b/rogueviz/fullnet.cpp
@@ -9,8 +9,6 @@ namespace rogueviz {
 
 namespace fullnet {
 
-int fullnet_id;
-
 void drawExtra() {  
   for(map<cell*, shiftmatrix>::iterator it = gmatrix.begin(); it != gmatrix.end(); it++) {
     cell *c = it->first;
@@ -40,7 +38,7 @@ auto hooks =
     using namespace arg;
     if(argis("-net")) {
       PHASE(3);
-      init(&fullnet_id, 0);
+      init(0);
       rv_hook(hooks_frame, 0, drawExtra);
       linepatterns::patTriTree.color = 0x30;
       linepatterns::patTriOther.color = 0x10;
diff --git a/rogueviz/kohonen.cpp b/rogueviz/kohonen.cpp
index 2134c514..d3f02bd6 100644
--- a/rogueviz/kohonen.cpp
+++ b/rogueviz/kohonen.cpp
@@ -16,8 +16,6 @@ void clear();
 void create_neurons();
 
 
-int kohonen_id;
-
 int columns;
 
 typedef vector<double> kohvec;
@@ -1770,7 +1768,7 @@ bool mark(cell *c) {
 
 void initialize_rv() {
   if(state & KS_ROGUEVIZ) return;
-  init(&kohonen_id, RV_GRAPH | RV_HAVE_WEIGHT);
+  init(RV_GRAPH | RV_HAVE_WEIGHT);
   state |= KS_ROGUEVIZ;
 
   rv_hook(hooks_frame, 50, levelline::draw);
diff --git a/rogueviz/rogueviz.cpp b/rogueviz/rogueviz.cpp
index df1fadda..3657643c 100644
--- a/rogueviz/rogueviz.cpp
+++ b/rogueviz/rogueviz.cpp
@@ -263,8 +263,6 @@ namespace anygraph {
   
   edgetype *any;
   
-  int vzid;
-  
   int N;
                
   void fixedges() {
@@ -280,7 +278,7 @@ namespace anygraph {
   void tst() {}
 
   void read(string fn, bool subdiv, bool doRebase, bool doStore) {
-    init(&vzid, RV_GRAPH);
+    init(RV_GRAPH);
     any = add_edgetype("embedded edges");
     fname = fn;
     fhstream f(fn + "-coordinates.txt", "rt");
@@ -888,7 +886,7 @@ void readcolor(const string& cfname) {
 
 void graph_rv_hooks();
 
-void init(void *_vizid, flagtype _vizflags) {
+void init(flagtype _vizflags) {
 
   autocheat = true; 
   showstartmenu = false;
@@ -911,7 +909,6 @@ void init(void *_vizid, flagtype _vizflags) {
   drawthemap();
   gmatrix0 = gmatrix;
 
-  vizid = _vizid;
   vizflags = _vizflags;
   
   graph_rv_hooks();
@@ -937,7 +934,6 @@ void close() {
     cleanup.back()();
     cleanup.pop_back();
     }
-  vizid = nullptr;
   relmatrices.clear();
   }
 
diff --git a/rogueviz/rogueviz.h b/rogueviz/rogueviz.h
index 53403359..757a83c9 100644
--- a/rogueviz/rogueviz.h
+++ b/rogueviz/rogueviz.h
@@ -17,8 +17,6 @@
 namespace rogueviz {
   using namespace hr;
   
-  inline void *vizid;
-  
   constexpr flagtype RV_GRAPH = 1;
   constexpr flagtype RV_WHICHWEIGHT = 2; // sag
   constexpr flagtype RV_AUTO_MAXWEIGHT = 4; // sag
@@ -34,7 +32,7 @@ namespace rogueviz {
   void drawExtra();
   void close();
 
-  void init(void *vizid, flagtype flags);
+  void init(flagtype flags);
   
   struct edgetype {
     double visible_from;
diff --git a/rogueviz/sag.cpp b/rogueviz/sag.cpp
index 3688e67c..8b1637e0 100644
--- a/rogueviz/sag.cpp
+++ b/rogueviz/sag.cpp
@@ -13,8 +13,6 @@ namespace sag {
 
   bool turn(int delta);
   
-  int sag_id;
-
   int sagpar = 0;
 
   enum eSagmode { sagOff, sagHC, sagSA };
@@ -422,7 +420,7 @@ namespace sag {
 
   void read(string fn) {
     fname = fn;
-    init(&sag_id, RV_GRAPH | RV_WHICHWEIGHT | RV_AUTO_MAXWEIGHT | RV_HAVE_WEIGHT);
+    init(RV_GRAPH | RV_WHICHWEIGHT | RV_AUTO_MAXWEIGHT | RV_HAVE_WEIGHT);
 
     rv_hook(rogueviz::hooks_close, 100, [] { sag::sagedges.clear(); });
     rv_hook(shmup::hooks_turn, 100, turn);
diff --git a/rogueviz/spiral.cpp b/rogueviz/spiral.cpp
index 197a254e..d5f11e88 100644
--- a/rogueviz/spiral.cpp
+++ b/rogueviz/spiral.cpp
@@ -10,8 +10,6 @@ namespace rogueviz {
 
 namespace spiral {
 
-  int spiral_id;
-
   ld mul;
   
   transmatrix at(double d) {
@@ -20,7 +18,7 @@ namespace spiral {
 
   void place(int N, ld _mul) {
     mul = _mul;
-    init(&spiral_id, RV_GRAPH | RV_HAVE_WEIGHT | RV_INVERSE_WEIGHT);
+    init(RV_GRAPH | RV_HAVE_WEIGHT | RV_INVERSE_WEIGHT);
     rv_hook(hooks_alt_edges, 100, spiral_altedge);
     rv_hook(hooks_frame, 0, drawExtra);
     weight_label = "extent";
diff --git a/rogueviz/tree.cpp b/rogueviz/tree.cpp
index 6c2282df..8853a57d 100644
--- a/rogueviz/tree.cpp
+++ b/rogueviz/tree.cpp
@@ -8,8 +8,6 @@ namespace rogueviz {
 
 namespace tree {
 
-  int tree_id;
-  
   edgetype *tree_edge;
 
   struct treevertex {
@@ -63,7 +61,7 @@ namespace tree {
     
   void read(string fn) {
     fname = fn;
-    init(&tree_id, RV_GRAPH | RV_COMPRESS_LABELS | RV_COLOR_TREE);
+    init(RV_GRAPH | RV_COMPRESS_LABELS | RV_COLOR_TREE);
     tree_edge = add_edgetype("tree edge");
     printf("Reading the tree of life...\n");
     FILE *f = fopen(fname.c_str(), "rt");