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From: Bob Hughes
Subject: kinetic energy by scavenging ideas :-) [~155KB Mpg]
Date: 4 Jul 2000 02:08:45
Message: <39617f6d@news.povray.org>
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This is a son of Frankenstein's monster considering it's made up of 3 ideas
gathered from around here lately at the newsgroups. I made a Newton's Balls
because of zwatts' post here and did it with the glowing spot idea at
p.newusers where Heather Pinnix asked about firefly glows. Also the Sun was
something I started doing because Zilvah asked how to make one at
p.text.tutorials.
Not much else to it. Just thought people might like to see it. The balls
blink as they make contact, getting dimmer as they lose momentum. Not
realistic stuff and somewhat fast-motion I think.
Bob
--
omniVerse http://users.aol.com/persistenceofv/all.htm
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Attachments:
Download 'Kinetic5.mpg' (115 KB)
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From: Tony[B]
Subject: Re: kinetic energy by scavenging ideas :-) [~155KB Mpg]
Date: 4 Jul 2000 23:11:51
Message: <3962a777@news.povray.org>
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Different... :) I like.
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Can you re-educate me: does emitting media cast shadows? Do these balls cast
shadows because they are in fact light sources; is there a way to make meida
cast shadows?
Bob Hughes wrote:
> This is a son of Frankenstein's monster considering it's made up of 3 ideas
> gathered from around here lately at the newsgroups. I made a Newton's Balls
> because of zwatts' post here and did it with the glowing spot idea at
> p.newusers where Heather Pinnix asked about firefly glows. Also the Sun was
> something I started doing because Zilvah asked how to make one at
> p.text.tutorials.
> Not much else to it. Just thought people might like to see it. The balls
> blink as they make contact, getting dimmer as they lose momentum. Not
> realistic stuff and somewhat fast-motion I think.
>
> Bob
> --
> omniVerse http://users.aol.com/persistenceofv/all.htm
>
> Name: Kinetic5.mpg
> Kinetic5.mpg Type: MPEG Video (video/mpeg)
> Encoding: x-uuencode
Post a reply to this message
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On Wed, 05 Jul 2000 09:04:06 -0400, "Greg M. Johnson"
<gre### [at] my-dejanews com> wrote:
>Can you re-educate me: does emitting media cast shadows? Do these balls cast
>shadows because they are in fact light sources; is there a way to make meida
>cast shadows?
Emissing media does not cast a shadow. Absorbing or scattering media
will if the container object uses filtered transparency and not
transmitting.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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From: Bob Hughes
Subject: Re: kinetic energy by scavenging ideas :-) [~155KB Mpg]
Date: 5 Jul 2000 19:38:28
Message: <3963c6f4@news.povray.org>
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"Peter Popov" <pet### [at] usanet> wrote in message
news:tin6ms0242hl3ndavkiv7ee2oouans879d@4ax.com...
| On Wed, 05 Jul 2000 09:04:06 -0400, "Greg M. Johnson"
| <gre### [at] my-dejanewscom> wrote:
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| >Can you re-educate me: does emitting media cast shadows? Do these balls
cast
| >shadows because they are in fact light sources; is there a way to make
meida
| >cast shadows?
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| Emissing media does not cast a shadow. Absorbing or scattering media
| will if the container object uses filtered transparency and not
| transmitting.
Thanks for answering Peter, except the question is two-fold really. I used
lights inside to help facilitate the glow or else other objects would not have
had shadows. No radiosity had been used but I guess that would have done some
shadowing if I had. These media container objects were incorporated into a
'looks_like' inside of each light source so they were shadowless regardless of
filtered or transmitted transparency ;-)
Bob
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On Wed, 5 Jul 2000 18:37:55 -0500, "Bob Hughes"
<per### [at] aolcom?subject=PoV-News:> wrote:
>Thanks for answering Peter, except the question is two-fold really. I used
>lights inside to help facilitate the glow or else other objects would not have
>had shadows. No radiosity had been used but I guess that would have done some
>shadowing if I had. These media container objects were incorporated into a
>'looks_like' inside of each light source so they were shadowless regardless of
>filtered or transmitted transparency ;-)
I just had a very odd idea -- how about using radiosity and no-image?
Add a highly ambient white ball with each media sphere and give it
no_image (in MegaPOV), then turn on radiosity. Might just work.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
Post a reply to this message
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In article <tin6ms0242hl3ndavkiv7ee2oouans879d@4ax.com>, Peter Popov
<pet### [at] usanet> wrote:
> Emissing media does not cast a shadow. Absorbing or scattering media
> will if the container object uses filtered transparency and not
> transmitting.
Media does not normally cast light, if that is what Greg M. Johnson was
asking. Scattering media will show shadows cast through it, and both
scattering and absorbing media will cast shadows(blocking light) if
their container uses filter.
The radiosity in MegaPOV takes media into account, so this can be used
to mimic light coming from emitting media. You might get faster or more
controllable results by using area lights, though.
--
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
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In article <pr48mscs4sjg9co1bscjdigs86hlok134f@4ax.com>, Peter Popov
<pet### [at] usanet> wrote:
> I just had a very odd idea -- how about using radiosity and no-image?
> Add a highly ambient white ball with each media sphere and give it
> no_image (in MegaPOV), then turn on radiosity. Might just work.
I think no_image will also mean no radiosity, which kind of wreaks that
idea. I'm not certain, though...
--
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
Post a reply to this message
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From: Bob Hughes
Subject: Re: kinetic energy by scavenging ideas :-) [~155KB Mpg]
Date: 8 Jul 2000 18:31:10
Message: <3967abae@news.povray.org>
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"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-F043C2.16203108072000@news.povray.org...
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| I think no_image will also mean no radiosity
Correct, apparently.
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From: Bob Hughes
Subject: Re: kinetic energy by scavenging ideas :-) [~155KB Mpg]
Date: 8 Jul 2000 18:37:42
Message: <3967ad36@news.povray.org>
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"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-0C3A71.16192608072000@news.povray.org...
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| The radiosity in MegaPOV takes media into account, so this can be used
| to mimic light coming from emitting media. You might get faster or more
| controllable results by using area lights, though.
'area_light' has that unfortunate tendency to be useless in animations.
Without the 'jitter' added to it the banding effect is almost never suitable,
with it it could never be. I used it in this animation figuring the number
and dimness of each wouldn't have shadows which are noticed easily. Using
radiosity in some manner could certainly be a workaround but then, as you say,
not as much control over such faked shadows I guess.
Bob
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