diff --git a/config.cpp b/config.cpp
index 5c1b87b7..1d0f596a 100644
--- a/config.cpp
+++ b/config.cpp
@@ -22,6 +22,42 @@ EX bool return_false() { return false; }
 
 EX bool use_bool_dialog;
 
+/** set to true if a parameter was changed as a consequence of changing linked parameters */
+EX bool linked_consequence;
+
+EX void adjust_linked() {
+  indenter ind(2);
+  geom3::invalid = "";
+  dynamicval<bool> d(linked_consequence, true);
+  if(vid.tc_alpha < vid.tc_depth && vid.tc_alpha < vid.tc_camera) {
+    find_edit(&pconf.alpha)->set_cld(tan_auto(vid.depth) / tan_auto(vid.camera));
+    }
+  else if(vid.tc_depth < vid.tc_alpha && vid.tc_depth < vid.tc_camera) {
+    ld v = pconf.alpha * tan_auto(vid.camera);
+    if(hyperbolic && (v<1e-6-12 || v>1-1e-12)) {
+      geom3::invalid = XLAT("cannot adjust depth");
+      v = vid.camera;
+      }
+    else v = atan_auto(v);
+    find_edit(&vid.depth)->set_cld(v);
+    }
+  else {
+    ld v = tan_auto(vid.depth) / pconf.alpha;
+    if(hyperbolic && (v<1e-12-1 || v>1-1e-12)) {
+      geom3::invalid = XLAT("cannot adjust camera");
+      v = vid.depth;
+      }
+    else v = atan_auto(v);
+    find_edit(&vid.camera)->set_cld(v);
+    }
+  }
+
+EX void update_linked(int& t) {
+  if(linked_consequence) return;
+  t = ticks;
+  adjust_linked();
+  }
+
 EX string param_esc(string s);
 
 EX void non_editable_pre() { if(game_active) stop_game(); };
@@ -1853,7 +1889,7 @@ EX void saveConfig() {
   if(vid.tc_depth > vid.tc_camera) pt_depth++;
   if(vid.tc_depth < vid.tc_camera) pt_camera++;
   if(vid.tc_depth > vid.tc_alpha ) pt_depth++;
-  if(vid.tc_depth < vid.tc_alpha ) pt_alpha ++;
+  if(vid.tc_depth < vid.tc_alpha ) pt_alpha++;
   if(vid.tc_alpha > vid.tc_camera) pt_alpha++;
   if(vid.tc_alpha < vid.tc_camera) pt_camera++;
   vid.tc_alpha = pt_alpha;
@@ -2562,7 +2598,6 @@ EX void showJoyConfig() {
 #endif
 
 EX void projectionDialog() {
-  vid.tc_alpha = ticks;
   dialog::editNumber(vpconf.alpha, -5, 5, .1, 1,
     XLAT("projection distance"),
     XLAT("HyperRogue uses the Minkowski hyperboloid model internally. "
@@ -2591,6 +2626,7 @@ EX void projectionDialog() {
     dialog::addItem(sphere ? "towards orthographic" : "towards Gans model", 'T');
     dialog::add_action([] () { double d = 1.1; vpconf.alpha *= d; vpconf.scale *= d; dialog::get_ne().reset_str(); });
     };
+  dialog::get_di().reaction = [] { update_linked(vid.tc_alpha); };
   }
 
 EX void menuitem_projection_distance(key_type key) {
@@ -3154,7 +3190,6 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
     ->editable(-5, 5, .1, "eye level", "", 'E')
     ->set_extra([] {
       dialog::get_di().dialogflags |= sm::CENTER;
-      vid.tc_camera = ticks;
     
       dialog::addHelp(XLAT("In the FPP mode, the camera will be set at this altitude (before applying shifts)."));
 
@@ -3164,7 +3199,8 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
         vid.auto_eye = !vid.auto_eye;
         geom3::do_auto_eye();
         });
-      });
+      })
+    ->set_reaction([] { update_linked(vid.tc_camera); });
   
   param_b(vid.auto_eye, "auto-eyelevel", false);
 
@@ -3250,7 +3286,6 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
   param_f(vid.depth, parameter_names("depth", "3D depth"), 1)
     ->editable(0, 5, .1, "Ground level below the plane", "", 'd')
     ->set_extra([] {
-        vid.tc_depth = ticks;
         help = XLAT(
           "Ground level is actually an equidistant surface, "
           "%1 absolute units below the plane P. "
@@ -3282,17 +3317,13 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
         dialog::addHelp(help);
         })
     ->set_reaction([] {
-        bool b = vid.tc_alpha < vid.tc_camera;
-        if(vid.tc_alpha >= vid.tc_depth) vid.tc_alpha = vid.depth - 1;
-        if(vid.tc_camera >= vid.tc_depth) vid.tc_camera = vid.depth - 1;
-        if(vid.tc_alpha == vid.tc_camera) (b ? vid.tc_alpha : vid.tc_camera)--;
+        update_linked(vid.tc_depth);
         geom3::apply_settings_light();
         });
   param_f(vid.camera, parameter_names("camera", "3D camera level"), 1)
     ->editable(0, 5, .1, "", "", 'c')
     ->modif([] (float_parameter* x) { x->menu_item_name = (GDIM == 2 ? "Camera level above the plane" : "Z shift"); })
     ->set_extra([] {    
-       vid.tc_camera = ticks;
        if(GDIM == 2)
        dialog::addHelp(XLAT(
          "Camera is placed %1 absolute units above a plane P in a three-dimensional "
@@ -3309,7 +3340,10 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
          dialog::addHelp(XLAT("Look from behind."));
        if(GDIM == 3 && pmodel == mdPerspective) 
          dialog::addBoolItem_action(XLAT("reduce if walls on the way"), vid.use_wall_radar, 'R');
-       });
+       })
+    ->set_reaction([] {
+      update_linked(vid.tc_camera);
+      });
   param_f(vid.wall_height, parameter_names("wall_height", "3D wall height"), .3)
     ->editable(0, 1, .1, "Height of walls", "", 'w')
     ->set_extra([] () {
diff --git a/geometry.cpp b/geometry.cpp
index b784b677..ab280630 100644
--- a/geometry.cpp
+++ b/geometry.cpp
@@ -1011,21 +1011,9 @@ EX namespace geom3 {
     using namespace geom3;
     DEBBI(DF_INIT | DF_POLY | DF_GEOM, ("geom3::compute"));
     // tanh(depth) / tanh(camera) == pconf.alpha
-    invalid = "";
     
     if(GDIM == 3 || flipped || changing_embedded_settings);
-    else if(vid.tc_alpha < vid.tc_depth && vid.tc_alpha < vid.tc_camera)
-      pconf.alpha = tan_auto(vid.depth) / tan_auto(vid.camera);
-    else if(vid.tc_depth < vid.tc_alpha && vid.tc_depth < vid.tc_camera) {
-      ld v = pconf.alpha * tan_auto(vid.camera);
-      if(hyperbolic && (v<1e-6-12 || v>1-1e-12)) invalid = XLAT("cannot adjust depth"), vid.depth = vid.camera;
-      else vid.depth = atan_auto(v);
-      }
-    else {
-      ld v = tan_auto(vid.depth) / pconf.alpha;
-      if(hyperbolic && (v<1e-12-1 || v>1-1e-12)) invalid = XLAT("cannot adjust camera"), vid.camera = vid.depth;
-      else vid.camera = atan_auto(v);
-      }
+    else adjust_linked();
     
     if(fabs(pconf.alpha) < 1e-6) invalid = XLAT("does not work with perfect Klein");
   
diff --git a/models.cpp b/models.cpp
index 537e8ce7..29dd0352 100644
--- a/models.cpp
+++ b/models.cpp
@@ -1078,6 +1078,7 @@ EX namespace models {
         p.alpha = 1;
         auto proj = param_custom_ld(p.alpha, sp+"projection", menuitem_projection_distance, 'p');
         proj->help_text = "projection distance|Gans Klein Poincare orthographic stereographic";
+        proj->reaction = [] { update_linked(vid.tc_alpha); };
         }
       else {
         param_f(p.alpha, sp+"projection", 1);