To make something fully transparent in the materials room, set Transparency and  Transparency_Edge to 1.0.  Set Transparency_Falloff to 0.0.  Set the specularity to 0.0.  A completely transparent material should not cast any shadows. 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.