Fix GLB export: remove hidden visibility, return plain paths

app.py

@@ -690,7 +690,7 @@ def extract_glb(
     glb_path = os.path.join(user_dir, f'sample_{timestamp}.glb')
     glb.export(glb_path, extension_webp=True)
     torch.cuda.empty_cache()
-    return gr.update(value=glb_path, visible=True), gr.update(value=glb_path, visible=True)
+    return glb_path, glb_path
 
 
 with gr.Blocks(theme=gr.themes.Soft(primary_hue="orange", neutral_hue="slate")) as demo:
@@ -745,8 +745,8 @@ with gr.Blocks(theme=gr.themes.Soft(primary_hue="orange", neutral_hue="slate"))
 
         with gr.Column(scale=10):
             preview_output = gr.HTML(empty_html, label="3D Asset Preview", show_label=True, container=True)
-            glb_output = gr.Model3D(label="Extracted GLB", height=400, show_label=True, display_mode="solid", clear_color=(0.25, 0.25, 0.25, 1.0), visible=False)
-            download_btn = gr.DownloadButton(label="Download GLB", visible=False)
+            glb_output = gr.Model3D(label="Extracted GLB", height=400, show_label=True, display_mode="solid", clear_color=(0.25, 0.25, 0.25, 1.0))
+            download_btn = gr.DownloadButton(label="Download GLB")
 
             with gr.Row():
                 generate_btn = gr.Button("Generate", variant="primary")