Implement lazy texture initialization for API endpoints

- Added generate_texture_lazy() GPU function with lazy initialization
- Texture pipeline is now initialized inside GPU function to avoid CUDA startup issues
- Enables full texture generation for API endpoints
- Resolves CUDA initialization errors while maintaining texturing capability

gradio_app.py

@@ -185,8 +185,8 @@ def process_generation_job(job_id: str, images: Dict[str, str], options: Dict[st
         if should_texture and HAS_TEXTUREGEN:
             try:
                 text_path = os.path.join(save_folder, 'textured_mesh.obj')
-                # Use GPU function for texture generation
-                textured_mesh_path = generate_texture(
+                # Use GPU function for texture generation with lazy initialization
+                textured_mesh_path = generate_texture_lazy(
                     mesh_path=reduced_mesh_path, 
                     image_path=main_image, 
                     output_mesh_path=text_path
@@ -631,11 +631,24 @@ def generation_all(
         seed,
     )
 
+
 @spaces.GPU(duration=60)
-def generate_texture(mesh_path, image_path, output_mesh_path):
-    """Generate texture for a mesh using GPU function."""
+def generate_texture_lazy(mesh_path, image_path, output_mesh_path):
+    """Generate texture for a mesh using lazy initialization to avoid CUDA startup issues."""
     try:
-        textured_mesh_path = tex_pipeline(
+        # Lazy initialization of texture pipeline inside GPU function
+        from hy3dpaint.textureGenPipeline import Hunyuan3DPaintPipeline, Hunyuan3DPaintConfig
+        
+        conf = Hunyuan3DPaintConfig(max_num_view=8, resolution=768)
+        conf.realesrgan_ckpt_path = "hy3dpaint/ckpt/RealESRGAN_x4plus.pth"
+        conf.multiview_cfg_path = "hy3dpaint/cfgs/hunyuan-paint-pbr.yaml"
+        conf.custom_pipeline = "hy3dpaint/hunyuanpaintpbr"
+        
+        # Initialize texture pipeline inside GPU function
+        local_tex_pipeline = Hunyuan3DPaintPipeline(conf)
+        
+        # Generate texture
+        textured_mesh_path = local_tex_pipeline(
             mesh_path=mesh_path, 
             image_path=image_path, 
             output_mesh_path=output_mesh_path,