"Shalom" <sha### [at] homecom> wrote in message
news:3bc6e73a$1@news.povray.org...
> I've been using povray for some time now, but there's still one thing I can't
> do properly - lighting. No matter what lighting model I use, it just doesn't
> work.
>
> The problem is that I have a very, very large room, with 5 relatively small
> objects in it. I am taking a couple of pictures of each of these objects from
> several angles, as well as the whole room by itself. The problem is, that even
> if I provide a large ambient value, Pov-ray does not shade shadows. Therefore,
> if I only have 1 or 2 lights to light up this room, 1 side of all these
objects
> will always be in shadow, and not much better looking than a standard scanline
> renderer.
>
> Of course, the first thing that comes to mind is an area light. However, this
> doesn't work because the room is very, very large, and the objects are spread
> around the room, and even an area light of 30 X 30 lights (which would take
> HOURS to render) would still look like there are just 2 lights, 1 on each
side,
> which doesn't make very nice shadows.
>
> I could also put small area lights on top of each object, but that would make
> it look like there's a lot of light concentration in a few areas in the
> pictures of the whole room.
>
> Currently, I'm using an interesting model I invented: 2 lights on the exact
> same spot, both with 50% brightness, but one of them shadowless, and one of
> them not. This way, shadowed areas are darker than non-shadowed areas, but are
> still shaded.
>
> This method works quite well, but its not quite right. The best thing would be
> this, but I don't think it's possible in Povray:
> Area lights, I believe, only use the extra light to calculate shadows, but do
> all the shading based on the main light. It would be good to have the same
sort
> of thing as area lights, where the shading comes from 1 single spot, but where
> the shadows are calculated based on a few lights just above each object. This
> way, each object would have smooth shading, but one wouldn't need 100X100
> lights to cover a whole room, just a couple of lights for each object.
>

Have you tried radiosity?

- Nekar


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