fix(3d-model): Resolve pipeline failures and fallback errors

models/model_3d_generator.py

@@ -113,7 +113,7 @@ class Hunyuan3DGenerator:
                         raise  # Re-raise the exception to halt execution and see the error
 
                 # 1. Install requirements from the model's specific requirements file
-                requirements_path = os.path.join(self.model_path, 'requirements.txt')
+                requirements_path = os.path.join(self.model_path, 'requirements_hunyuan3d.txt')
                 if os.path.exists(requirements_path):
                     pip_command = [
                         sys.executable, '-m', 'pip', 'install', '-r', requirements_path,
@@ -416,14 +416,14 @@ class Hunyuan3DGenerator:
         # Create center vertex
         center = np.mean(base_vertices, axis=0)
         base_vertices.append(center)
-        center_idx = start_idx + len(base_vertices) - 1
+        center_idx = len(base_vertices) - 1
         
         # Create base faces
         for i in range(len(boundary_indices)):
             next_i = (i + 1) % len(boundary_indices)
             base_faces.append([
-                start_idx + i,
-                start_idx + next_i,
+                i,
+                next_i,
                 center_idx
             ])