POV-Ray : Newsgroups : povray.binaries.tutorials : Its not so simple Server Time
28 May 2024 21:28:26 EDT (-0400)
  Its not so simple (Message 1 to 2 of 2)  
From: Axel Baune
Subject: Its not so simple
Date: 8 Dec 1998 11:10:13
Message: <366D4F7E.AA488504@neuro.informatik.uni-ulm.de>
Hello,

I've tried it for myself to convert old Haloeffects to the new Medias,
and found ist is not possible to get
the same effects as with the old halos.

One problem is, that the New Medias ignore the transmit and filter
informations of the colors. For some of the Halos you could convert them
to new Medias under certain circumstances, but this is not possible for
all and somtimes it is very difficult to get the old effects.

The scaling problem persist in the form, that when you scale the media
the same portion of emitting, absorption or scattering is distributed to
a larger space. This means you will get lower emission, absorption or
scattering per unit. To compensate this effect simly scale the amount of
emitting, absorption or scatterin in the same way as the object, i.e. if
you have emitting 0.75 befor scaling try emitting 0.75*Scaling for the
scaled Object.

In general it is not possible to convert the old Halos to the new Medias
because they are completly different implemented. If I am wrong please
report!

Yours Axel

--
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Axel Baune                                            Phone:  +49 731 502 4242
Department of Neural Information Processing             Fax:  +49 731 502 4156
University of Ulm
89069 Ulm                            email: aba### [at] neuroinformatikuni-ulmde
Germany                            URL (privat): http://www.uni-ulm.de/~abaune
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From: Mike
Subject: Re: Its not so simple
Date: 8 Dec 1998 22:55:25
Message: <366E8F43.73418C60@aol.com>
No, you're right.

But think of it this way...media actually makes more sense.  Ever get
consistent results with a glowing media?  I never did.  And attenuating
kinda' stunk.  It didn't absorb, it just added it's color to the one
behind it.

Media is pretty simple.  If you want it to absorb, just give it an
absorption and a value.  Emit - emission and a value.  Scatter some
light - scattering and a value.  A little of each - just use more than
one.

It's different, but in my opinion it's better too.  The odd reflection
artifacts when using halos seem to be gone now.  I still keep a copy of
3.02 on my computer, but I use 3.1 for most of my new work.

-Mike



Axel Baune wrote:

>  In general it is not possible to convert the old Halos to the new
> Medias because they are completly different implemented. If I am wrong
> please report!
>
>


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