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From: Tom Melly
Subject: Re: Lake View, or: wow reflection blur + iso can be slow [~50K Jpg]
Date: 6 Apr 2001 04:12:39
Message: <3acd7a77$1@news.povray.org>
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Hmm, seems counter-intuitive to me that a reflection of an iso should take
any longer to render than the iso itself. Anyone got an explanation?
"Bob H." <omn### [at] msn com> wrote in message
news:3acca47d@news.povray.org...
> I knew I should have said the water is only a textured plane.
>
> Bob H.
>
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From: Geoff Wedig
Subject: Re: Lake View, or: wow reflection blur + iso can be slow [~50K Jpg]
Date: 6 Apr 2001 07:39:00
Message: <3acdaad4@news.povray.org>
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Tom Melly <tom### [at] tomandlucouk> wrote:
> Hmm, seems counter-intuitive to me that a reflection of an iso should take
> any longer to render than the iso itself. Anyone got an explanation?
The reflection is blurred. Blurred reflections of anything take longer than
rendering the object itself.
Geoff
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From: Ben Birdsey
Subject: Re: Lake View, or: wow reflection blur + iso can be slow [~50K Jpg]
Date: 6 Apr 2001 09:38:19
Message: <3ACDC7EE.473B029E@mail.com>
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If reflection blur is causing the trouble, you may be able to get away
with something different. If the bump_map on the water has features
that are smaller than one pixel, anti-aliasing would do much the same
thing as the blurred reflections.
Both methods would average over a variety of "stochastically sampled"
reflected rays, but the "anti-aliasing method" would only be turned on
when it made a difference in the final image. Hopefully, this would
really improve the render time.
-Ben
<><
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From: Bob H
Subject: Re: Lake View, or: wow reflection blur + iso can be slow [~50K Jpg]
Date: 6 Apr 2001 16:04:49
Message: <3ace2161@news.povray.org>
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"Ben Birdsey" <cla### [at] mailcom> wrote in message
news:3ACDC7EE.473B029E@mail.com...
>
> If reflection blur is causing the trouble, you may be able to get away
> with something different. If the bump_map on the water has features
> that are smaller than one pixel, anti-aliasing would do much the same
> thing as the blurred reflections.
Hmmm, yeah, think I'll try changing the scaling of the normals anyway and
see if that improves things first before I give up on the reflection_blur
altogether. It occurs to me that what the blurring does is actually reverse
of what it would be IRL I believe. Distant horizon reflections should be
blurred more than those nearer below the camera due to the waves seen closer
together at an oblique angle far away.
Reflection blurring blends out the reflected objects the farther they get
into the reflecting surface.
That sound right anyone?
Bob H.
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