Which value in customDepthMaterial's shader is equal to instanceMatrix in vertexshader?

Questions
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1

Hi :grinning:

There is my codesandbox,

  1. using instanceMesh
  2. using extend meshstandardmaterial, edited the vertex with noise for spheres
  3. using customDepthMaterial’s onBeforeCompile function to correct the shadow

Finally, I want to edit the instanceMatrix in the extendShaderMaterial.
Therefore, I can edit mesh position with curl noise.

Which value should I edit in customDepthMaterial ‘shader’ that equal to instance matrix?