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gl_NormalMatrix in custom Shader


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Hey Folks!
For my custom Shader I want to use the object's normals in view space.
Therefor I need the gl_NormalMatrix. I know how to construct it (inverted
and transposed MVMatrix) but I don't want to construct it manually for
each object. I found this thread [SOLVED] - Shader Programs Attributes
And Uniforms
, but there was no hint on how the gl_NormalMatrix is called
in babylon. I also searched the babylon git-repository, but could not find
where the shader attributes and such are declared.

Can anyone please point me in the right direction?
Thank you for your time

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