class_docstr: **Bases:** :class:`GLGraphicsItem <pyqtgraph.opengl.GLGraphicsItem.GLGraphicsItem>`
  
  Displays a 3D triangle mesh. 
docstr: This method must be called to inform the item that the MeshData object
  has been altered.
docstr_tok: ["This","method","must","be","called","to","inform","the","item","that","the","MeshData","object","has","been","altered","."]
code: def meshDataChanged(self):
      """
      This method must be called to inform the item that the MeshData object
      has been altered.
      """
  
      self.vertexes = None
      self.faces = None
      self.normals = None
      self.colors = None
      self.edges = None
      self.edgeColors = None
      self.update()
  
file_path: pyqtgraph/pyqtgraph/opengl/items/GLMeshItem.py
imports: from OpenGL.GL import *
  import numpy
  from ...Qt import QtGui
  from ..None import shaders
  from ..GLGraphicsItem import GLGraphicsItem
  from ..MeshData import MeshData
label_desc: Use image node_id 6 for calling the GLMeshItem obj's underlying member method code with example usage: obj.meshDataChanged() without return types