code: public static AiScene importFile(String filename, 
                                       Set<AiPostProcessSteps> postProcessing) 
                                             throws IOException {
          return importFile(filename, postProcessing, null);
      }
docs: Imports a file via assimp.
  
  @param filename the file to import
  @param postProcessing post processing flags
  @return the loaded scene, or null if an error occurred
  @throws IOException if an error occurs