Complete EXTRUDE behavior and properties

src/app/commands/display.rs

@@ -736,21 +736,27 @@ impl OpenCADStudio {
             // ── EXTRUDE ────────────────────────────────────────────────────
             "EXTRUDE" | "THICKEN" => {
                 use crate::modules::insert::solid3d_cmds::ExtrudeCommand;
-                // If a single entity is already selected, skip the pick step.
+                // A preselection becomes the complete source set; otherwise
+                // the interactive command gathers any number of profiles.
                 let selected: Vec<_> = self.tabs[i].scene.selected_entities().into_iter().collect();
                 let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
-                if selected.len() == 1 {
-                    let handle = selected[0].0;
+                if !selected.is_empty() {
                     let mut cmd = ExtrudeCommand::new_named(cmd, color);
-                    if let Some(curve) = crate::entities::curve::entity_curve(selected[0].1) {
-                        cmd.set_entity_pick_direction(
-                            curve.plane.normal().map(glam::DVec3::from_array),
-                        );
-                        cmd.on_entity_pick(
-                            handle,
-                            glam::DVec3::from_array(curve.plane.origin),
-                        );
-                    }
+                    let first_curve = selected
+                        .iter()
+                        .find_map(|(_, entity)| crate::entities::curve::entity_curve(entity));
+                    let anchor = first_curve
+                        .as_ref()
+                        .map(|curve| glam::DVec3::from_array(curve.plane.origin))
+                        .unwrap_or(glam::DVec3::ZERO);
+                    let direction = first_curve
+                        .and_then(|curve| curve.plane.normal())
+                        .map(glam::DVec3::from_array);
+                    cmd.set_preselection(
+                        selected.iter().map(|(handle, _)| *handle).collect(),
+                        anchor,
+                        direction,
+                    );
                     self.command_line.push_info(&cmd.prompt());
                     self.tabs[i].active_cmd = Some(Box::new(cmd));
                 } else {