Fix load Parameter 0 error + 2D default on HF

app.py

@@ -57,6 +57,7 @@ from demo_core import (
     RUN_MODES,
     TRAJECTORY_VIEW_CHOICES,
     WEBGL_PROBE_JS,
+    default_trajectory_view,
     resolve_trajectory_mode,
     webgl_status_markdown,
     get_overview_composite_path,
@@ -950,10 +951,15 @@ def _apply_run_mode_with_3d(mode: str, history: dict | None, traj_view: str, web
     return _apply_run_mode(mode) + _plot_3d_for_mode(mode, history, traj_view, webgl_ok)
 
 
-def _on_webgl_probe(probe: str | None = None) -> tuple:
-    ok = str(probe if probe is not None else "1") != "0"
-    view_up = gr.update(value="2d") if not ok else gr.update()
-    return ok, view_up, webgl_status_markdown(ok, "2d" if not ok else "auto")
+def _on_webgl_probe(probe: str) -> tuple:
+    ok = str(probe).strip() != "0"
+    if is_hf_space():
+        view = "2d"
+    elif not ok:
+        view = "2d"
+    else:
+        view = "auto"
+    return ok, gr.update(value=view), webgl_status_markdown(ok, view)
 
 
 def _on_trajectory_view_change(view: str, webgl_ok: bool) -> str:
@@ -2648,6 +2654,7 @@ def build_app() -> gr.Blocks:
 
             opt_history_state = gr.State(None)
             webgl_ok_state = gr.State(True)
+            webgl_probe = gr.Textbox(value="1", visible=False, elem_classes=["vqc-webgl-probe"])
 
             with gr.Tabs():
                 with gr.Tab("OPTIMIZE"):
@@ -2658,12 +2665,15 @@ def build_app() -> gr.Blocks:
                     )
                     trajectory_view = gr.Radio(
                         choices=TRAJECTORY_VIEW_CHOICES,
-                        value="auto",
+                        value=default_trajectory_view(),
                         label="Trajectory view",
-                        info="Choose 2D if you see a WebGL error (common in embedded or privacy browsers).",
+                        info="2D is recommended on HF free tier. Choose 3D only if WebGL works in your browser.",
                         elem_classes=["vqc-trajectory-view-radio"],
                     )
-                    webgl_status = gr.Markdown("", elem_classes=["vqc-webgl-status"])
+                    webgl_status = gr.Markdown(
+                        webgl_status_markdown(True, default_trajectory_view()),
+                        elem_classes=["vqc-webgl-status"],
+                    )
                     with gr.Row():
                         with gr.Column(
                             visible=False,
@@ -3012,7 +3022,7 @@ def build_app() -> gr.Blocks:
         demo.load(_stream_term_boot, outputs=term_keypad_outputs)
         demo.load(
             _on_webgl_probe,
-            inputs=None,
+            inputs=[webgl_probe],
             outputs=[webgl_ok_state, trajectory_view, webgl_status],
             js=WEBGL_PROBE_JS,
         )

build_info.py

@@ -1,4 +1,4 @@
 """Auto-generated by scripts/deploy_hf_space.sh — do not edit by hand."""
 
 BUILD_COMMIT = "97b4a81"
-BUILD_UPDATED_UTC = "2026-06-28T17:15:51Z"
+BUILD_UPDATED_UTC = "2026-06-28T17:19:51Z"

demo_core.py

@@ -449,8 +449,20 @@ def resolve_trajectory_mode(view_pref: str, webgl_ok: bool) -> str:
     return "2d" if not webgl_ok else "3d"
 
 
+def default_trajectory_view() -> str:
+    """HF free tier defaults to 2D for maximum browser compatibility."""
+    return "2d" if is_hf_space() else "auto"
+
+
 def webgl_status_markdown(webgl_ok: bool, view_pref: str) -> str:
-    resolved = resolve_trajectory_mode(view_pref, webgl_ok)
+    if is_hf_space() and view_pref == "2d":
+        lead = (
+            "**HF free tier:** **2D (WebGL-safe)** trajectory is the default for maximum compatibility. "
+            "Switch to **3D interactive** if your browser supports WebGL."
+        )
+        if not webgl_ok:
+            return f"⚠ {lead} (WebGL probe failed — staying in 2D.)"
+        return lead
     if not webgl_ok:
         return (
             "⚠ **WebGL unavailable** — trajectory uses **2D stereographic projections**. "
@@ -754,7 +766,6 @@ def _make_loss_figure(
                 line_width=1,
                 line_dash="dot",
                 line_color=color,
-                opacity=0.55,
             )
             if i == len(monitor.burst_events[-12:]) - 1:
                 fig.add_annotation(