I hope it is okay to mention :) I have two Nude P4 figures in the Market Place that with the body morphs, scaling and face morphs make a huge variety of figure for a scene. I pose them, dress them in P4 standard clothes scaled as needed, export them with the clothes as .obj files and import them back in as a static prop... this way the render overhead is low but I can move the camera around and have them look right since they are true geometry and at render the shadows are right since everything is in the scene at once. Figure groups can also be saved as .obj. You loose the transperency setting you might have but I think for "mass" render like this it is good to remove all textures and use surface color only, the clothes can be textured after the fact in an editing program, just noise usually works but I have tiny cloth textures I apply with the Photoshop pattern brush. There is a product called AZL crowd Kit (I think) but it is pre-made figure groups mapped and transmappeded on a flat plane. There is something called RMW: Crowds and Army Generator 01 but I have no real idea how it works. It seems as though it is an aid in rendering large groups of figures and compositing them on transmaped planes but I could be totaly wrong about that.