Can you tell me a bit more about the implementation here? For example, I
have rendered a few scenes using an HDR file and I would like to "mask out"
the actual original scene that the HDR file contains. Is there a way to do
that? If I put a plane or perhaps a wall in front of the "background" image
that appears in my scene, will that block out the light coming from the HDR
file? In other words, does the placement of the HDR file in the scene act
exactly like a light-emitting source? That's the part I don't quite get.
In effect, the probes I have used are of a campus, a beach, a kitchen, etc.
and you can always see some part of that original scene in the POV scene.
I'd like to "sample" the illumination of the HDR file but leave the kitchen
(or the beach) out of my own picture.

Thanks much,
Dennis


"Gilles Tran" <git### [at] wanadoofr> wrote in message
news:3e10983b@news.povray.org...
>

> news: chr### [at] netplexaussieorg...
> > But it is still less accurate than radiosity could be, as far as I can
> > tell.
> Accuracy here is really a non-issue given the benefits...
>
> >Why use a high dynamic range environment map instead of sampling
> > the actual environment?
> > Speed? The ability to use real-world samples
> > instead of coding a background?
>
> Creating complex environments just to make them look nice in reflections
and
> project the right lights is rarely done :
> for practical purposes, you just don't code the whole St Peters Basilic to
> make a background (or you've really been raytracing too long...). There's
a
> example by Jaime who did a fake HDRI that way, but he used a complete
scene
> he had done before.
> Speed is of course a big issue there too, since maps render very fast.
> Also, natural light environments taken from photographs have a complexity
> and a richness that is unmatched by usual 3D lighting, which is why people
> go ooh and aah in front of these pics.
> Now HDR isn't the solution to all lighting problems, and is only valuable
in
> certain circumstances, like "packshot" images (close ups of objects), but
> then it is very good and extremly simple to set up using regular radiosity
> parameters.
>
> G.
>
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