diff --git a/rogueviz/banachtarski.cpp b/rogueviz/banachtarski.cpp
index 3d614177..76e33eff 100644
--- a/rogueviz/banachtarski.cpp
+++ b/rogueviz/banachtarski.cpp
@@ -207,7 +207,7 @@ int notry = 0;
 void bantar() {
   if(!on) return;
   cwt = cellwalker(currentmap->gamestart(), 0);
-  viewctr = heptspin(cwt.at->master, 0);
+  centerover = cwt.at;
   infos.clear();
   
   vector<bantar_config> genchoices;
diff --git a/rogueviz/cvl.cpp b/rogueviz/cvl.cpp
index 98aa69e8..d62b3e7e 100644
--- a/rogueviz/cvl.cpp
+++ b/rogueviz/cvl.cpp
@@ -6,7 +6,7 @@ namespace hr {
 #if CAP_SHOT
 struct location {
   transmatrix lView;
-  heptspin lviewctr;
+  cell *lco;
   };
 
 struct lineinfo {
@@ -19,10 +19,10 @@ map<int, lineinfo> lines;
 
 location loc_multiply(location orig, transmatrix T) {
   dynamicval<transmatrix> dv(View, orig.lView);
-  dynamicval<heptspin> dc(viewctr, orig.lviewctr);
+  dynamicval<cell*> dc(centerover, orig.lco);
   View = inverse(T) * View;
   for(int a=0; a<10; a++) optimizeview();
-  return location{View, viewctr};
+  return location{View, centerover};
   }
 
 bool show_map = false;
@@ -31,8 +31,8 @@ void cvl_marker() {
   if(show_map) for(auto& l: lines) {
     int id = 0;
     for(auto& loc: l.second.locs) {
-      if(gmatrix.count(loc.lviewctr.at->c7)) {
-        transmatrix T = gmatrix[loc.lviewctr.at->c7] * inverse(spin(loc.lviewctr.spin*2*M_PI/S7 + master_to_c7_angle())) * inverse(loc.lView);
+      if(gmatrix.count(loc.lco)) {
+        transmatrix T = gmatrix[loc.lco] * inverse(loc.lView);
         queuepoly(T, cgi.shAsymmetric, 0xFF00FFFF);
         queuestr(T, 1.0, its(l.first)+"/"+its(id), 0xFFFFFF);
         }
@@ -54,7 +54,7 @@ int readArgs() {
     int id;
     lineinfo l0;    
     scan(f, id, l0.plus_matrices, l0.minus_matrices);
-    l0.locs.push_back(location{View, viewctr});
+    l0.locs.push_back(location{View, centerover});
     for(int i=1; i<l0.plus_matrices; i++)
       l0.locs.push_back(loc_multiply(l0.locs.back(), xpush(1)));
     lines[id] = std::move(l0);
@@ -70,18 +70,18 @@ int readArgs() {
       for(int a=0; a<9; a++) scan(f, T[0][a]);
       scan(f, l1.plus_matrices, l1.minus_matrices);
       auto old = lines[id].locs[step];
-      println(hlog, "FROM ", old.lView, old.lviewctr, " id=", id, " step=", step);
+      println(hlog, "FROM ", old.lView, old.lco, " id=", id, " step=", step);
       l1.locs.push_back(loc_multiply(old, T));
-      println(hlog, "TO ", l1.locs.back().lView, l1.locs.back().lviewctr, "; creating ", l1.plus_matrices);
+      println(hlog, "TO ", l1.locs.back().lView, l1.locs.back().lco, "; creating ", l1.plus_matrices);
       for(int i=1; i<l1.plus_matrices; i++)
         l1.locs.push_back(loc_multiply(l1.locs.back(), xpush(1)));
-      println(hlog, "LAST ", l1.locs.back().lView, l1.locs.back().lviewctr);
+      println(hlog, "LAST ", l1.locs.back().lView, l1.locs.back().lco);
       }
     }
   else if(argis("-cvllist")) {
     for(auto& l: lines)
       for(auto& loc: l.second.locs) {
-        println(hlog, l.first, ". ", loc.lviewctr, " (dist=", celldist(loc.lviewctr.at->c7), "), View = ", loc.lView);
+        println(hlog, l.first, ". ", loc.lco, " (dist=", celldist(loc.lco), "), View = ", loc.lView);
         }
     }
   else if(argis("-cvlmap")) {
@@ -93,7 +93,7 @@ int readArgs() {
       int i = 0;
       for(auto& loc: p.second.locs) {
         dynamicval<transmatrix> dv(View, loc.lView);
-        dynamicval<heptspin> dc(viewctr, loc.lviewctr);
+        dynamicval<cell*> dc(centerover, loc.lco);
         shot::take(format(s.c_str(), p.first, i++));
         }
       }
diff --git a/rogueviz/flocking.cpp b/rogueviz/flocking.cpp
index 12866b9c..79f236e8 100644
--- a/rogueviz/flocking.cpp
+++ b/rogueviz/flocking.cpp
@@ -237,7 +237,7 @@ namespace flocking {
       auto m = vd.m;
       // these two functions compute new base and at, based on pats[i]
       m->at = pats[i];
-      virtualRebase(m, true);
+      virtualRebase(m);
       m->vel = vels[i];
       }
     shmup::fixStorage();
@@ -252,7 +252,7 @@ namespace flocking {
 
       if(follow == 1) {
         gmatrix.clear();
-        vdata[0].m->pat = View * calc_relative_matrix(vdata[0].m->base, viewctr.at->c7, C0) * vdata[0].m->at;
+        vdata[0].m->pat = View * calc_relative_matrix(vdata[0].m->base, centerover, C0) * vdata[0].m->at;
         View = spin(90 * degree) * inverse(vdata[0].m->pat) * View;
         if(GDIM == 3) {
           View = hr::cspin(1, 2, 90 * degree) * View;
@@ -274,7 +274,6 @@ namespace flocking {
         }
 
       optimizeview();
-      centerover.at = viewctr.at->c7;
       compute_graphical_distance();
       gmatrix.clear();
       playermoved = false;
diff --git a/rogueviz/grigorchuk.cpp b/rogueviz/grigorchuk.cpp
index eb4db9a7..4463f167 100644
--- a/rogueviz/grigorchuk.cpp
+++ b/rogueviz/grigorchuk.cpp
@@ -376,7 +376,7 @@ struct hrmap_grigorchuk : hrmap_standard {
   void draw() override {
   
     dq::visited_by_matrix.clear();
-    dq::enqueue_by_matrix(viewctr.at, actualV(viewctr, cview()));
+    dq::enqueue_by_matrix(centerover->master, cview() * master_relative(centerover, true));
     
     while(!dq::drawqueue.empty()) {      
       auto& p = dq::drawqueue.front();
diff --git a/rogueviz/rogueviz.cpp b/rogueviz/rogueviz.cpp
index 5bb645c5..31db71cd 100644
--- a/rogueviz/rogueviz.cpp
+++ b/rogueviz/rogueviz.cpp
@@ -237,7 +237,7 @@ void addedge(int i, int j, edgeinfo *ei) {
     
     addedge(i, id, ei);
     addedge(id, j, ei);
-    virtualRebase(vdata[i].m, true);
+    virtualRebase(vdata[i].m);
     }
   else addedge0(i, j, ei);
   }
@@ -284,7 +284,7 @@ namespace spiral {
   
       createViz(i, cwt.at, h);
       vd.name = its(i+1);
-      virtualRebase(vd.m, true);
+      virtualRebase(vd.m);
   
       vd.cp = dftcolor;
       }
@@ -331,7 +331,7 @@ namespace collatz {
     vdata.resize(1);
     vertexdata& vd = vdata[0];
     createViz(0, cwt.at, xpush(cshift));
-    virtualRebase(vd.m, true);
+    virtualRebase(vd.m);
     vd.cp = dftcolor;
     vd.data = 0;
     addedge(0, 0, 1, false, collatz::collatz1);
@@ -466,7 +466,7 @@ namespace anygraph {
       printf("Rebasing...\n");
       for(int i=0; i<isize(vdata); i++) {
         if(i % 10000 == 0) printf("%d/%d\n", i, isize(vdata));
-        if(vdata[i].m) virtualRebase(vdata[i].m, true);
+        if(vdata[i].m) virtualRebase(vdata[i].m);
         }
       printf("Done.\n");
       }
@@ -567,7 +567,7 @@ namespace tree {
     
     for(int i=0; i<isize(vdata); i++) {
       vertexdata& vd = vdata[i];
-      virtualRebase(vd.m, true);
+      virtualRebase(vd.m);
       }
     
     printf("Clearing the TOL data...\n");
@@ -1383,7 +1383,7 @@ bool drawVertex(const transmatrix &V, cell *c, shmup::monster *m) {
         }
       else {
       
-        cell *center = multidraw ? c : euclid ? cwt.at : viewctr.at->c7;
+        cell *center = multidraw ? c : centerover;
       
         if(!multidraw && ei->orig && ei->orig != center && celldistance(ei->orig, center) > 3) 
           ei->orig = NULL;
@@ -1469,7 +1469,7 @@ bool drawVertex(const transmatrix &V, cell *c, shmup::monster *m) {
       vertexdata& vdn = vdata[i0];
       createViz(i0, m->base, m->at * collatz::T2);
       
-      virtualRebase(vdn.m, true);
+      virtualRebase(vdn.m);
       vdn.cp = perturb(cp);
       vdn.data = 0;
       addedge(i, i0, 1, false, collatz::collatz1);
@@ -1492,7 +1492,7 @@ bool drawVertex(const transmatrix &V, cell *c, shmup::monster *m) {
         vdata.resize(i0+2);
         vertexdata& vdn = vdata[i0+1];
         createViz(i0+1, m->base, m->at * collatz::T3);
-        virtualRebase(vdn.m, true);
+        virtualRebase(vdn.m);
         vdn.cp = perturb(cp);
         vdn.data = 0;
         addedge(i, i0+1, 1, false, collatz::collatz2);
@@ -2148,7 +2148,7 @@ template<class T> function<void(presmode)> roguevizslide(char c, const T& t) {
     slidecommand = "toggle the player";
     if(mode == 4) 
       mapeditor::drawplayer = !mapeditor::drawplayer;
-    centerover.at = NULL; pd_from = NULL;
+    pd_from = NULL;
     };
   }