Use feature edges for normal 3D selection (#971)

Use feature edges for normal 3D selection

src/scene/mod.rs

@@ -8215,6 +8215,60 @@ impl Scene {
         )
     }
 
+    /// Normal object selection for shaded 3D bodies is edge based. This keeps
+    /// the broad face interior available to modelling commands without making
+    /// it part of ordinary object picking.
+    pub fn solid_edge_click_hit(
+        &self,
+        cursor: iced::Point,
+        view_rot: glam::Mat4,
+        eye: glam::DVec3,
+        bounds: iced::Rectangle,
+        candidate_handles: Option<&HashSet<Handle>>,
+        tolerance_px: f32,
+    ) -> Option<Handle> {
+        let meshes = self.interaction_meshes_arc();
+        pick::hit_test::mesh_edge_click_hit(
+            cursor,
+            meshes.iter().filter_map(|set| {
+                let handle = set.entity_handle()?;
+                if candidate_handles.is_some_and(|handles| !handles.contains(&handle)) {
+                    return None;
+                }
+                let (edges, edges_low) = set.geometry_edges();
+                (!edges.is_empty()).then_some((
+                    handle,
+                    edges,
+                    edges_low,
+                    set.instance_transform,
+                ))
+            }),
+            view_rot,
+            eye,
+            bounds,
+            tolerance_px,
+        )
+    }
+
+    pub fn solid_edge_hover_hit(
+        &self,
+        cursor: iced::Point,
+        view_rot: glam::Mat4,
+        eye: glam::DVec3,
+        bounds: iced::Rectangle,
+        candidate_handles: Option<&HashSet<Handle>>,
+        tolerance_px: f32,
+    ) -> Option<Handle> {
+        self.solid_edge_click_hit(
+            cursor,
+            view_rot,
+            eye,
+            bounds,
+            candidate_handles,
+            tolerance_px,
+        )
+    }
+
     pub fn solid_click_point_for(
         &self,
         cursor: iced::Point,