rpc shadows in viz-render, beginner

[TWSARCH]

Sorry, new to this forum. I posted this question in the general forum then found the forum jump, so here it is again hopefully in the correct location. Can I delete the one in the wrong place?

I am fairly new to the world of 3D and have been working in architectural desktop and viz render for only the last few years. I have been using 3-D cars and tress that we made in auto cad and they work, but look terrible and bog down the computer something awful, as would be expected form the files this results in.

I am trying out rpc with the free – demo content and it looks promising. However I can’t figure out how to get realistic shadows (or any shadows for that matter) from the rpc objects. I tried the shadow tutorials but they don’t seem to be geared to the ADT viz render application and I got nowhere. If anybody can help me with this or point me in the right direction for beginner info it would be great. Thanks.