I have 72 frames of this so that is not workable.....I have found a way using shadow catch in the materials room - it gives me what I want but I have dozens of mats that would need this turn on for.  Don't suppose you would know of a script that would do this? There is a wacro setup but it only affects the current mat.....just like checking the box --- surely there is a way to apply to all mats....

Windows 10 - Poser Pro 2012 - 64Bit - 24GB RAM - 4 x 3.40 GHZ processor