code: def get_rbg_value(self, points, view_dirs, diffuse_normals):
      output = self.implicit_network(points)
      g = self.implicit_network.gradient(points)
      normals = g[:, 0, :]
      feature_vectors = output[:, 1:]
  
      diffuse_shading = self.diffuse_network(diffuse_normals)
      specular_shading = self.specular_network(normals, view_dirs)
      albedo = self.albedo_network(points, feature_vectors)
  
      diffuse_shading = (diffuse_shading + 1.0) / 2.0
      specular_shading = (specular_shading + 1.0) / 2.0
      albedo = (albedo + 1.0) / 2.0
  
      rgb_vals = diffuse_shading * albedo + specular_shading
      rgb_vals = (rgb_vals * 2.0) - 1.0
  
      return rgb_vals
  
imports: import torch
  import torch.nn
  import numpy
  import trimesh
  import os
  from utils import rend_util
  from model.embedder import *
  from model.ray_tracing import RayTracing
  from model.sample_network import SampleNetwork
label_desc: Use image node_id 3 for calling the IFNetwork obj's underlying member method code with example usage: obj.get_rbg_value(points, view_dirs, diffuse_normals) and returns: rgb_vals