code: def apply_transform(self, matrix):
          
          matrix = np.asanyarray(matrix, order='C', dtype=np.float64)
          if matrix.shape != (4, 4):
              raise ValueError('Transformation matrix must be (4,4)!')
  
          if np.allclose(matrix, np.eye(4)):
              log.debug('apply_tranform received identity matrix')
              return
  
          new_transform = np.dot(matrix, self.primitive.transform)
  
          self.primitive.transform = new_transform
docs: Apply a transform to the current primitive (sets self.transform)
  
          Parameters
          -----------
          matrix: (4,4) float, homogenous transformation