I think Flyerx had a small tutorial on it.
http://mysite.verizon.net/sfg0000/
Poke around..

The idea was that you take a plane and give a
almost transperant texture. That way it will recieve
shadows but also interact with the back ground.

In other software packages like 3ds Max and so on
you have something called a matte material.
This material can cast and recieve shadows and so on
but otherwise it doesn't interfear with the scene in
any way. Quite useful. That is one way they incorporate
CG with live shots like in Starwars e t c.


Stefan


"SmartDen" <nomail@nomail> wrote in message 
news:web.4513a528b592cdc578e8d7530@news.povray.org...
> Hi All!
>
> I tryed here to place a car in a HDRI environment so, that the shadow of 
> the
> car seems to lying on the ground of the HDRI. I cann't get it on the 
> direct
> way, so i render the car, the environment and the shadow separatly and 
> then
> compose it in The Gimp. What do you mean, is that succeeded, is that looks
> realistic? Is there an another way to do this?
>
>

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