Refactor node building logic to support recursive child attachment in bridge reification

bridge/src/lib.rs

@@ -134,21 +134,24 @@ impl Reify for BridgeState {
             }
         }
         
-        let children = self.nodes.iter().filter_map(|(id, node)| {
+        // Helper to recursively build a node and its children
+        fn build_node(
+            id: u64,
+            nodes: &HashMap<u64, Node>,
+            downloader: &ModelDownloader,
+        ) -> Option<(u64, ast::elements::Spatial)> {
+            let node = nodes.get(&id)?;
             let dims = glam::Vec3::from(node.dimensions);
             if dims.length() < 0.001 {
                 eprintln!("[bridge/reify] Skipping node {} (zero dimensions)", id);
                 return None;
             }
-            
             let (scale, rot, trans) = node.transform.to_scale_rotation_translation();
             let vis_scale = if dims.length() > 0.001 { dims } else { scale };
-            
             let trans_array = [trans.x, trans.y, trans.z];
             let rot_array = [rot.x, rot.y, rot.z, rot.w];
             let scale_array = [vis_scale.x, vis_scale.y, vis_scale.z];
             let transform = stardust_xr_fusion::spatial::Transform::from_translation_rotation_scale(trans_array, rot_array, scale_array);
-            
             // Try to load the appropriate model based on entity type and model URL
             let model_child = if let Some(model_path) = get_model_path(node.entity_type, &node.model_url, downloader) {
                 let entity_type_name = match node.entity_type {
@@ -160,18 +163,14 @@ impl Reify for BridgeState {
                     6 => "light",
                     _ => "unknown"
                 };
-
                 let model_source = if !node.model_url.is_empty() {
                     format!("from URL: {}", node.model_url)
                 } else {
                     format!("primitive from {}", model_path.display())
                 };
-
                 eprintln!("[bridge/reify] Loading {} for node {} {}", entity_type_name, id, model_source);
-
                 match node.entity_type {
                     4 => {
-                        // Text entity: use node.name as text for now
                         let text = ast::elements::Text::new(&node.name)
                             .character_height(node.dimensions[1].max(0.01))
                             .color(ast::elements::RgbaLinear::new(
@@ -180,18 +179,15 @@ impl Reify for BridgeState {
                         Some(text.build())
                     }
                     5 => {
-                        // Image entity: use PanelUI as a placeholder for now
                         eprintln!("[bridge/reify] Image entity type detected for node {}. Using PanelUI as placeholder.", id);
                         let panel = ast::elements::PanelUI::default();
                         Some(panel.build())
                     }
                     6 => {
-                        // Light entity: use asteroids Light element
                         eprintln!("[bridge/reify] Light entity type detected for node {}.", id);
                         let color = ast::elements::RgbaLinear::new(
                             node.color[0], node.color[1], node.color[2], node.color[3]
                         );
-                        // Use y dimension as intensity if available, else default to 1.0
                         let intensity = node.dimensions.get(1).copied().unwrap_or(1.0).max(0.01);
                         let light = ast::elements::Light::new()
                             .color(color)
@@ -199,7 +195,6 @@ impl Reify for BridgeState {
                         Some(light.build())
                     }
                     7 => {
-                        // Zone entity: use asteroids Zone element
                         eprintln!("[bridge/reify] Zone entity type detected for node {}.", id);
                         let color = ast::elements::RgbaLinear::new(
                             node.color[0], node.color[1], node.color[2], node.color[3]
@@ -238,14 +233,30 @@ impl Reify for BridgeState {
                 eprintln!("[bridge/reify] No model available for entity type {} (node {})", node.entity_type, id);
                 None
             };
-            
-            Some((*id, Spatial::default()
+            // Recursively build children
+            let children: Vec<_> = nodes.iter()
+                .filter_map(|(child_id, child_node)| {
+                    if child_node.parent == Some(id) {
+                        build_node(*child_id, nodes, downloader)
+                    } else {
+                        None
+                    }
+                })
+                .collect();
+            let mut spatial = Spatial::default()
                 .transform(transform)
                 .build()
-                .maybe_child(model_child)))
-        });
-
-        PlaySpace.build().stable_children(children)
+                .maybe_child(model_child);
+            for (_cid, child_spatial) in children {
+                spatial = spatial.child(child_spatial);
+            }
+            Some((id, spatial))
+        }
+        // Only attach root nodes (no parent) to PlaySpace
+        let root_nodes: Vec<_> = self.nodes.iter()
+            .filter_map(|(id, node)| if node.parent.is_none() { build_node(*id, &self.nodes, downloader) } else { None })
+            .collect();
+        PlaySpace.build().stable_children(root_nodes)
     }
 }