This was an add-on developed by Oleg Schmidt and contributed to the community. His web site is no longer up, and the add-on was released only for 8.1 and 9.0 AFAIK.
rxAutoMaterials would take an autoscripted GDL object (one saved from plan or 3D window) and convert all materials in the script to parameters. This is a very nice thing, as it allowed the creation of material-parametric objects instantly by any user without ever having to look at the GDL editor.
GS should buy this from him and offer it as a Goodie IMHO...
Karl
PS Oleg's license prohibits posting the add-on here, but I'm attaching his PDF describing it as I don't think he'd mind that.
One of the forum moderators
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