extra scene tweaks

vis/include/combo_iterator.hpp

@@ -61,6 +61,19 @@ public:
         (*this)++;
         return res;
     }
+
+    auto operator--(int) {
+        std::next_permutation(bits.begin(), bits.end());
+        set_curr();
+        --at;
+        return *this;
+    }
+
+    auto operator--() &{
+        auto res = *this;
+        (*this)--;
+        return res;
+    }
 };
 
 template<class T>

vis/src/main.cpp

@@ -156,19 +156,21 @@ void run(GLFWwindow *window) {
         .stage(sh.slice)
         .stage(sh.solid);
 
-    auto group = tc::schlafli({3, 4, 3, 2});
+    auto group = tc::schlafli({5, 3, 3, 2});
 
     const auto combos = Combos<int>({0, 1, 2, 3, 4}, 3);
 
+    const auto coord = (vec5) {1.0, 0.1, 0.1, 0.1, 0.025};
+
     auto slices = {
         Slice<4>::build(
             group,
-            (vec5) {1.0, 0.1, 0.1, 0.1, 0.025} * 0.8,
-            {0.9f, 0.9f, 0.9f, 1.0f},
+            coord * 0.3,
+            {0.9f, 0.3f, 0.3f, 1.0f},
             combos.begin(), combos.end()),
         Slice<4>::build(
             group,
-            (vec5) {1.0, 0.1, 0.1, 0.1, 0.025},
+            coord,
             {0.3f, 0.3f, 0.3f, 1.0f},
             combos.begin()++, combos.end()),
     };