docstr: Initialize the graphics window and mesh surface
docstr_tok: ["Initialize","the","graphics","window","and","mesh","surface"]
code: def __init__(self):
      """
      Initialize the graphics window and mesh surface
      """
  
      # setup the view window
      self.app = QtGui.QApplication(sys.argv)
      self.window = gl.GLViewWidget()
      self.window.setWindowTitle("Terrain")
      self.window.setGeometry(0, 110, 1920, 1080)
      self.window.setCameraPosition(distance=30, elevation=12)
      self.window.show()
  
      # constants and arrays
      self.nsteps = 1.3
      self.offset = 0
      self.ypoints = np.arange(-20, 20 + self.nsteps, self.nsteps)
      self.xpoints = np.arange(-20, 20 + self.nsteps, self.nsteps)
      self.nfaces = len(self.ypoints)
  
      self.RATE = 44100
      self.CHUNK = len(self.xpoints) * len(self.ypoints)
  
      self.p = pyaudio.PyAudio()
      self.stream = self.p.open(
          format=pyaudio.paInt16,
          channels=1,
          rate=self.RATE,
          input=True,
          output=True,
          frames_per_buffer=self.CHUNK,
      )
  
      # perlin noise object
      self.noise = OpenSimplex()
  
      # create the veritices array
      verts, faces, colors = self.mesh()
  
      self.mesh1 = gl.GLMeshItem(
          faces=faces,
          vertexes=verts,
          faceColors=colors,
          drawEdges=True,
          smooth=False,
      )
      self.mesh1.setGLOptions("additive")
      self.window.addItem(self.mesh1)
  
file_path: audio-spectrum-analyzer/terrain_audio.py
imports: import numpy
  from opensimplex import OpenSimplex
  import pyqtgraph.opengl
  from pyqtgraph.Qt import QtCore, QtGui
  import struct
  import pyaudio
  import sys
label_desc: Use image node_id 1 to create a new Terrain object from inherited base classes: object with example: obj = Terrain()