add halfedge element viz min size

src/gui/manager.cpp

@@ -561,6 +561,7 @@ void Manager::UInew_light(Scene &scene, Undo &undo) {
 
     unsigned int idx = 0;
 
+    ImGui::SetNextWindowSizeConstraints({200.0f, 0.0f}, {FLT_MAX,FLT_MAX});
     ImGui::Begin("New Light", &new_light_window,
                     ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar |
                     ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_AlwaysAutoResize);
@@ -705,6 +706,7 @@ void Manager::UInew_obj(Undo &undo) {
         new_obj_window = false;
     };
 
+    ImGui::SetNextWindowSizeConstraints({200.0f, 0.0f}, {FLT_MAX,FLT_MAX});
     ImGui::Begin("New Object", &new_obj_window,
                  ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar |
                  ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_AlwaysAutoResize);

src/gui/model.cpp

@@ -220,17 +220,23 @@ void Model::unset_mesh() { my_mesh = nullptr; }
 void Model::vertex_viz(Halfedge_Mesh::VertexRef v, float &size, Mat4 &transform) {
 
     // Sphere size ~ 0.05 * min incident edge length
-    float d = FLT_MAX;
+    float min = FLT_MAX;
+    float avg = 0.0f;
+    size_t d = 0;
+
     auto he = v->halfedge();
     do {
         Vec3 n = he->twin()->vertex()->pos;
-        float e = (n - v->pos).norm_squared();
-        d = d < e ? d : e;
+        float len = he->edge()->length();
+        min = std::min(min, len);
+        avg += len;
+        d++;
         he = he->twin()->next();
     } while (he != v->halfedge());
 
-    d = std::sqrt(d);
-    size = d < 2.0f ? d : 2.0f;
+    avg = avg / d;
+    size = clamp(min, avg / 10.0f, avg);
+
     transform = Mat4{Vec4{size, 0.0f, 0.0f, 0.0f}, Vec4{0.0f, size, 0.0f, 0.0f},
                      Vec4{0.0f, 0.0f, size, 0.0f}, Vec4{v->pos, 1.0f}};
 }
@@ -864,6 +870,7 @@ std::string Model::select(Widgets &widgets, Scene_ID click, Vec3 cam, Vec2 spos,
             return err;
         } else {
             widgets.start_drag(Halfedge_Mesh::center_of(selected_element().value()), cam, spos, dir);
+            apply_transform(widgets);
         }
 
     } else if (!widgets.is_dragging() && click >= n_Widget_IDs) {