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Bump2d was made from a pass through shader that modifies the normal to a shader that outputs the normal directly to be connected onto standard_surface.
So instead of
standard -> bump2d.shader
you need to have
bump2d -> standard_surface.normal
yes,i understand,I mean how to make a shader like old core version bump2d shader,i need the shader in core 6 arnold for my pipeline
or some document about shader writing in modifying normal data in inputed shader rgba