One of the problems I encountered was that the hole as a whole was encased and it did not have any light source hitting in itself. The most important thing for a triple rendered material is to have a clear light source to form the main color, highlight color and shadow color. Therefore, this scene could not use the material node of the three renderings, which once bothered me a lot. Therefore, I had to use the traditional 3d material, out of the effect I am not very satisfied.