I'm using the following Transform3D

m_00 = -1, m_11 = m_22 = m_33 = 1, and zero for all other elements,

on a TransformGroup to effect a reflection of the scenegraph about
the yz-plane. And when I do that, the geometry gets transformed correctly
but the diffuse and specular lightings get clobbered !

Is there any issue with transforming normals with the above
matrix structure, or am I missing something trivial !

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