How can I render my figure over a transparent background to add post work later?

I suspect someone will have a better answer than the one I'm about to give, but I think the trick is to gave the graphic in a format that allows for you to have a separate alpha channel. When you bring your graphic up in Photoshop or Paint Shop Pro or whatever you are using to do your postwork, you can delete the background using the alpha channel. I don't believe (though I could be wrong) that there is a way to render on a transparent background.

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Sounds like everyone is saying render with a green screen type thing and add in the background onver the green screen. I can do that, but I was wondering if I could do this so that I dont have to delete things. A time saver. Anyway, if I have to do it this way, how can I keep it anti alised when I cut it out.

Save as a TIF or PNG. Both of these leave you with an alpha channel (not a green screen) which makes it easy to cut your rendered objects and paste them onto something else. The rendered objects will be anti aliased and retain their transparency characteristics, too. If you want the anti aliasing to be finer, render a very large image, then reduce.

Thank you, Sam. I knew there was a better explanation than mine.

I was gonna say i always save in PNG format, when i open it in Photoshop it has a transparent background.

thx for the tip. I don't know why but the png helped. Wonder why it has that bg when saved as a png? Oh well it works for me lol thx.