Alain <ele### [at] netscapenet> wrote:
> Your area_light array is to sparse, giving you those grainy penumbraes.
> The optimum adaptive arrays are: 5*5, 9*9, 17*17, 33*33, 65*65,... This is due
> in the maner that the adaptive process works. The formulae for the optimum array
> size is: 2^n +1 where "n" is at least 1 more than the adaptive value.
> As the surface that receive the shadow is close to the object, you can probably
> use adaptive 0 without problem.
> With adaptive 0, I regularly use arrays of 17*17 or 33*33 with render times only
> slightly longer than with point lights.

Must say, thank you Alain. That explains a great deal and a picture serves
little purpose here.

Real glad that I got keyword lookup working in my compilation. It is imperative
that all reserved words are well understood before proceeding. I should take
month off to read manuals but unlikely that I will. Even if I did I doubt I
would learn this. I read area lights but don't recall such info on optimum
adaptive arrays. Seems to me adaptive 0 would be the fastest possible.

But I am impressed with the effect the HDR light emission. And slightly more
impressed with your knowledge.

Thank you so very much,
aQ


> --
> Alain
> -------------------------------------------------
> EVERYTHING HAS A GENDER
>
> You may not know this but many nonliving things have a gender...
>
> An Hourglass is Female, because over time, the weight shifts to the bottom.

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"alphaQuad" <alp### [at] earthlinknet> wrote:
> "Bill Pragnell" <bil### [at] hotmailcom> wrote:
> > Here it is:

Nice. My camera def has a square aspect ratio, so your image looks a little
stretched... alter 'right' to suit your resolution, or use a square image!
Looks like I modified that box since making the original images, too :).

> I learned much from that. It is the language of your soul and also the language
> of rapid POV instruction. Is there a reason that "Round_Box_Union" does not
> turn the color of reserved words? Mpov 1.2.1

Yes - it's not a reserved word! It's a macro in shapes.inc. Have a look at the
docs, there are many useful macros and shapes in this file:
http://www.povray.org/documentation/view/3.6.1/468/

Bill

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"sooperFoX" <bon### [at] gmailcom> wrote:

> > "Kenneth" <kdw### [at] earthlinknet> wrote:

> > > Is it possible to apply a HDR image to the inside of a large, hollow sphere in
> > > POV, then use that (with ambient 1) to generate the photons (and reflections in
> > > the glass)?
> >
> > OOPS--sorry. That was a real faux-pas. I was thinking of radiosity.
>
> Hi Ken,
>
> It certainly is possible, that is what I did for the image I posted. ...

Thank you!  That gives me a *much* better understanding of how to use this HDR
process.  Cheers!

Ken

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