diff --git a/render-worker/scripts/turntable_render.py b/render-worker/scripts/turntable_render.py
index 77f5523..78d8cf0 100644
--- a/render-worker/scripts/turntable_render.py
+++ b/render-worker/scripts/turntable_render.py
@@ -363,6 +363,12 @@ def main():
         _idx = argv.index("--sensor-width")
         _sensor_width = float(argv[_idx + 1]) if _idx + 1 < len(argv) else None
 
+    # Named argument: --material-override <material_name>
+    _material_override = None
+    if "--material-override" in argv:
+        _idx = argv.index("--material-override")
+        _material_override = argv[_idx + 1] if _idx + 1 < len(argv) else None
+
     # Ensure scripts dir is on path for shared module imports
     _scripts_dir = os.path.dirname(os.path.abspath(__file__))
     if _scripts_dir not in sys.path:
@@ -447,6 +453,14 @@ def main():
         for part in parts:
             _apply_smooth(part, SMOOTH_ANGLE)
 
+        # Apply material override if set
+        if _material_override:
+            print(f"[turntable_render] material_override active: all parts → {_material_override}", flush=True)
+            if _usd_mat_lookup:
+                _usd_mat_lookup = {k: _material_override for k in _usd_mat_lookup}
+            if material_map:
+                material_map = {k: _material_override for k in material_map}
+
         # Material assignment: USD primvar path first, then name-matching fallback
         if material_library_path and _usd_mat_lookup:
             _apply_material_library_direct(parts, material_library_path, _usd_mat_lookup)
@@ -531,6 +545,14 @@ def main():
         for i, part in enumerate(parts):
             _apply_smooth(part, SMOOTH_ANGLE)
 
+        # Apply material override if set (object-rotation mode)
+        if _material_override:
+            print(f"[turntable_render] material_override active (obj-rot): all parts → {_material_override}", flush=True)
+            if _usd_mat_lookup:
+                _usd_mat_lookup = {k: _material_override for k in _usd_mat_lookup}
+            if material_map:
+                material_map = {k: _material_override for k in material_map}
+
         # Material assignment: USD primvar path first, then name-matching fallback
         if material_library_path and _usd_mat_lookup:
             _apply_material_library_direct(parts, material_library_path, _usd_mat_lookup)