Another possibility is the Environment box-method.

Let's say you create a scene in Terragen.
You then let the program render the picture for
0 - 90 - 180 - -90 and one with a pitch
towards the sky. Remember to set the camera
to 1/1 ratio.

Now you have 5 images that you can map to a
box (or cube, if you like..). When rendered
with a camera inside this cube, and if you have
been accurate, the environment will be seemless.
This can ofcourse be compared to making a
HDRI in, for instance, Terragen wich has some
advantages. But I've used the mentioned method
a couple of times with good results. Renders fast
too. :) Of course you'll have to put your lightsource
so that it matches the "sun" from the Terragen images.

Stefan

"Rick Measham" <rickm*at%isite.net.au> skrev i meddelandet 
news:434351fc@news.povray.org...
> Is it possible to set the background image .. something that will:
> a) Show through in alpha mode
> b) Give some data to the rest of an image when the start/end row/column 
> are set
>
> Cheers!
> Rick Measham

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