more intuitive 3D setting

config.cpp

@@ -837,6 +837,9 @@ EX void initConfig() {
 
   param_f(geom3::euclid_embed_scale, "euclid_embed_scale", "euclid_embed_scale");
 
+  param_b(geom3::auto_configure, "auto_configure_3d", "auto_configure_3d")
+  -> editable("set 3D settings automatically", 'A');
+
   param_enum(geom3::spatial_embedding, "spatial_embedding", "spatial_embedding", geom3::seDefault)
   ->editable(geom3::spatial_embedding_options, "3D embedding method", 'E')
   ->set_reaction([] {
@@ -2203,6 +2206,53 @@ EX void edit_levellines(char c) {
     });
   }
 
+EX geom3::eSpatialEmbedding shown_spatial_embedding() {
+  if(GDIM == 2) {
+    if(pmodel == mdDisk && pconf.camera_angle)
+      return geom3::seTPP;
+    else
+      return geom3::seNone;
+    }
+  return geom3::spatial_embedding;
+  }
+
+EX void show_spatial_embedding() {
+  cmode = sm::SIDE | sm::MAYDARK | sm::CENTER | sm::PANNING | sm::SHOWCURSOR;
+  gamescreen();
+  dialog::init(XLAT("3D styles"));
+  auto emb = shown_spatial_embedding();
+  add_edit(geom3::auto_configure);
+
+  dialog::addBreak(100);
+
+  auto &seo = geom3::spatial_embedding_options;
+
+  for(int i=0; i<isize(seo); i++) {
+    auto se = geom3::eSpatialEmbedding(i);
+    if(!geom3::auto_configure && geom3::is_suboption(se)) continue;
+    dialog::addBoolItem(XLAT(seo[i].first), emb == i, 'a' + i);
+    dialog::add_action([se, emb] {
+      if(GDIM == 3) { if(geom3::auto_configure) geom3::switch_fpp(); else geom3::switch_always3(); }
+      if(se == geom3::seNone && emb == geom3::seTPP) geom3::switch_tpp();
+      if(se == geom3::seTPP && emb == geom3::seNone) geom3::switch_tpp();
+      if(se != geom3::seNone && se != geom3::seTPP) {
+        println(hlog, "set spatial_embedding to ", int(se));
+        geom3::spatial_embedding = se;
+        if(geom3::auto_configure) geom3::switch_fpp(); else geom3::switch_always3();
+        delete_sky();
+        resetGL();
+        }
+      });
+    }
+
+  dialog::addBreak(100);
+  dialog::addHelp(XLAT(seo[emb].second));
+  dialog::addBreak(100);
+  dialog::addBack();
+
+  dialog::display();
+  }
+
 EX void show3D() {
   cmode = sm::SIDE | sm::MAYDARK;
   gamescreen();
@@ -2210,27 +2260,12 @@ EX void show3D() {
 
 #if MAXMDIM >=4
   if(WDIM == 2) {
-    if(WDIM == 2) add_edit(geom3::spatial_embedding);
-    dialog::addBoolItem(XLAT("configure FPP automatically"), GDIM == 3, 'F');
-    dialog::add_action(geom3::switch_fpp);
+    dialog::addSelItem("3D style", geom3::spatial_embedding_options[shown_spatial_embedding()].first, 'E');
+    dialog::add_action_push(show_spatial_embedding);
+    dialog::addBreak(50);
     }
 #endif
 
-  dialog::addBreak(50);
-
-  if(GDIM == 2) {
-    dialog::addBoolItem(XLAT("configure TPP automatically"), pmodel == mdDisk && pconf.camera_angle, 'T');
-    dialog::add_action(geom3::switch_tpp);
-    }
-
-  dialog::addBreak(50);
-
-#if MAXMDIM >= 4
-  if(WDIM == 2) {
-    dialog::addBoolItem(XLAT("use the full 3D models"), vid.always3, 'U');
-    dialog::add_action(geom3::switch_always3);
-    }
-#endif
   if(vid.use_smart_range == 0 && GDIM == 2) {
     add_edit(vid.highdetail);
     add_edit(vid.middetail);

geometry.cpp

@@ -1073,6 +1073,8 @@ EX namespace geom3 {
 
   #if HDR
   enum eSpatialEmbedding {
+    seNone,
+    seTPP,
     seDefault,
     seFlat,
     seInverted,
@@ -1088,7 +1090,9 @@ EX namespace geom3 {
   #endif
 
   EX vector<pair<string, string>> spatial_embedding_options = {
-    {"default",         "Embed as a equidistant surface in the 3D version of the same geometry. This is the model used by HyperRogue in its 2D graphics."},
+    {"2D engine",       "Use HyperRogue's 2D engine to simulate 'default 3D' top-down."},
+    {"2D engine in TPP","HyperRogue's 2D engine, but using third-person perspective."},
+    {"default 3D",      "Embed as a equidistant surface in the 3D version of the same geometry."},
     {"flat",            "Embed as a flat surface in the 3D version of the same geometry."},
     {"inverted",        "Embed as a equidistant surface, but this time it is inverted."},
     {"lower curvature", "Embed as a convex surface in a space of lower curvature."},
@@ -1103,8 +1107,13 @@ EX namespace geom3 {
     {"stretched hyperbolic inverted",              "Embed into stretched hyperbolic geometry as a concave horosphere. Works only with Euclidean. You need to set the variation to Pure."},
     };
 
-  EX eSpatialEmbedding spatial_embedding;
+  EX eSpatialEmbedding spatial_embedding = seDefault;
   EX ld euclid_embed_scale = 1;
+  EX bool auto_configure = true;
+
+  EX bool is_suboption(eSpatialEmbedding se) {
+    return among(se, seTPP, seInverted, seFlat, seLowerCurvatureInverted, seMuchLowerCurvatureInverted, seNIH_inv);
+    }
 
   EX vector<geometryinfo> ginf_backup;