OK, I've finally gotten fully involved with PV360.  Though I don't like that I cannot tweak a scene or material, the renderings themselves are quite clean and they set up quickly.  But I have some questions after producing some renderings I needed to process later with Photoshop:

1)  How do I get a shadow to fall across a floor, while not explicitly showing the floor and environment?  If you see my web site, this is the general format I've used for my renderings when I used PhotoWorks (which is now hopelessly broken), and I'd like to mimic these results if possible.  I noticed if I select the option to hide the environment, my shadow also disappears.  (I don't really want a glossy floor--only a shadow.)

2)  When I save a rendering to PNG or TIFF (formats which have alpha channels for transparent backgrounds), the rendering nonetheless renders the background as solid black and not transparent.  Is there a way to change this?  I'd prefer white over black, and transparent over anything.  I don't see any options anywhere to specify this properly.

I appreciate any help with this.  Thanks!