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From: rodv92
Subject: relativistic travel effects
Date: 5 Nov 2016 00:50:06
Message: <web.581d2c98d977da711d2ae3900@news.povray.org>
Hi there,

i am thinking of the tools i could use to make an animation of a camera
accelerating toward 0,99c speed.

If i remember well, i would have to use a widening focal to make the direction
the camera is going appear as if it was receding and concentrating the field of
view toward a point.

For this i could use some kind of conical media, going darker at the sides and
adding redshift effects, and chromatic aberrations.

See : www.youtube.com/watch?v=JQnHTKZBTI4

Am I in the good direction, any better ideas ?

Thanks


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From: omniverse
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 02:30:01
Message: <web.581d43536c13e4639c5d6c810@news.povray.org>
"rodv92" <nomail@nomail> wrote:
> Hi there,
>
> i am thinking of the tools i could use to make an animation of a camera
> accelerating toward 0,99c speed.

Maybe a mesh camera? Something I'm only now trying to learn about but I know
there's effects using mesh camera macro (example scene files) for lens
distortion such as barrel and pincushion.

I recall from years ago there were things tried by people to point the POV-Ray
camera into cone shapes, that could have been for media containers, but
unfortunately I can't remember if anything was done to simulate near-light
speed. Probably was, but I didn't find anything in a search just now.


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From: omniverse
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 04:40:00
Message: <web.581d61eb6c13e4639c5d6c810@news.povray.org>
"omniverse" <omn### [at] charternet> wrote:
> "rodv92" <nomail@nomail> wrote:
> > Hi there,
> >
> > i am thinking of the tools i could use to make an animation of a camera
> > accelerating toward 0,99c speed.
>
> Maybe a mesh camera? Something I'm only now trying to learn about but I know
> there's effects using mesh camera macro (example scene files) for lens
> distortion such as barrel and pincushion.

Good thing you asked about this sort of thing because I finally looked at the
mesh camera files and found that the pincushion effect could possibly be what
you need. You will have to find out for yourself, but try the following from
...scenes\camera\mesh_camera\meshcam_persp_compare.pov

   meshcam_lens(image_width, image_height, 67, -2, "")
//    meshcam_pinhole(image_width, image_height, c_angle, "")

Replacing the commented line with this "lens" line, look for it at the first
#declare camera_mesh=
I think it should render a scene with no other changes made, but you'll just
have to find out.
The 67 is camera angle and the -2 is pincushion amount. Negatives for that,
positive for barrel distortion.

Bob


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From: clipka
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 08:42:15
Message: <581d9b67$1@news.povray.org>
Am 05.11.2016 um 01:49 schrieb rodv92:
> Hi there,
> 
> i am thinking of the tools i could use to make an animation of a camera
> accelerating toward 0,99c speed.
> 
> If i remember well, i would have to use a widening focal to make the direction
> the camera is going appear as if it was receding and concentrating the field of
> view toward a point.
> 
> For this i could use some kind of conical media, going darker at the sides and
> adding redshift effects, and chromatic aberrations.
> 
> See : www.youtube.com/watch?v=JQnHTKZBTI4

"Dieses Video ist in deinem Land nicht verfügbar."
("This video is not available in your country.")
Oh great.
I hate YouTube.

Anyway:

From what I know you'll need more than just a distortion of the field of
view; most notably, objects will appear "rotated" somehow.


There used to be a patched version of POV-Ray specifically designed to
simulate relativistic effects. It'll be quite out of date, but maybe
it'll do what you need.


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From: omniverse
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 12:35:01
Message: <web.581dd1436c13e4639c5d6c810@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 05.11.2016 um 01:49 schrieb rodv92:
> > Hi there,
> >
> > i am thinking of the tools i could use to make an animation of a camera
> > accelerating toward 0,99c speed.
> >
> > If i remember well, i would have to use a widening focal to make the direction
> > the camera is going appear as if it was receding and concentrating the field of
> > view toward a point.
> >
> > For this i could use some kind of conical media, going darker at the sides and
> > adding redshift effects, and chromatic aberrations.
> >
> > See : www.youtube.com/watch?v=JQnHTKZBTI4
>
> "Dieses Video ist in deinem Land nicht verfügbar."
> ("This video is not available in your country.")
> Oh great.
> I hate YouTube.

I was going to see if I could find something else similar enough but instead
this other web page about physics rendered with P-R caught my attention.
Includes relativistic effects and links to more.

http://bugman123.com/Physics/index.html

The YouTube animation basically shows a series of accelerations showing a
stretching forward viewpoint and curving surroundings together with shifting
color (Redshift), also lack of color nearby.

> From what I know you'll need more than just a distortion of the field of
> view; most notably, objects will appear "rotated" somehow.
>
> There used to be a patched version of POV-Ray specifically designed to
> simulate relativistic effects. It'll be quite out of date, but maybe
> it'll do what you need.

Searched and found this web page of text+pictures about that. Was based on
POV-Ray 2.0, no luck locating the actual program. All broken links, as well as
the one from povray.org

https://www.researchgate.net/publication/2574193_Relativistic_Ray-Tracing_Simulating_the_Visual_Appearance_of_Rapidly_M
oving_Objects


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From: Stephen
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 13:36:31
Message: <581de05f$1@news.povray.org>
On 11/5/2016 12:32 PM, omniverse wrote:
> I was going to see if I could find something else similar

I remember a video made with a patched version of povray from years ago. 
I have never been able to find it again.
But using the wayback machine you can download the source code here

https://web.archive.org/web/19970220101552/http://www.cs.mu.oz.au/~andrbh/raytrace/raytrace_source.html

I hope it is the right one.

-- 

Regards
     Stephen


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From: Stephen
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 13:40:04
Message: <581de134$1@news.povray.org>
On 11/5/2016 1:36 PM, Stephen wrote:
> On 11/5/2016 12:32 PM, omniverse wrote:
>> I was going to see if I could find something else similar
>
> I remember a video made with a patched version of povray from years ago.
> I have never been able to find it again.
> But using the wayback machine you can download the source code here
>
>
https://web.archive.org/web/19970220101552/http://www.cs.mu.oz.au/~andrbh/raytrace/raytrace_source.html
>
>
> I hope it is the right one.
>

This was the thread I found it in.

http://news.povray.org/povray.unofficial.patches/thread/%3Cweb.3de6ef98c20e2bf3c571aa6c0%40news.povray.org%3E/?mtop=199902



-- 

Regards
     Stephen


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From: clipka
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 13:50:43
Message: <581de3b3$1@news.povray.org>
Am 05.11.2016 um 14:36 schrieb Stephen:
> On 11/5/2016 12:32 PM, omniverse wrote:
>> I was going to see if I could find something else similar
> 
> I remember a video made with a patched version of povray from years ago.
> I have never been able to find it again.
> But using the wayback machine you can download the source code here
> 
>
https://web.archive.org/web/19970220101552/http://www.cs.mu.oz.au/~andrbh/raytrace/raytrace_source.html

Just 722 kByte in 46 source code files? With makefiles and all?

Wow -- if only modern POV-Ray was that lean ;)
Then again, that was over 20 years ago...


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From: Bald Eagle
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 14:00:00
Message: <web.581de5466c13e463634be200@news.povray.org>
VSauce did an episode on this, so it probably contains information which is
probably current / accurate.

https://www.youtube.com/watch?v=3pAnRKD4raY

Hope that may help.

As others have pointed out, there have been a few attempts to do this in
POV-Ray.  Very nice job digging that all up - source and everything!  :)


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From: Stephen
Subject: Re: relativistic travel effects
Date: 5 Nov 2016 14:03:26
Message: <581de6ae$1@news.povray.org>
On 11/5/2016 1:50 PM, clipka wrote:
> Am 05.11.2016 um 14:36 schrieb Stephen:
>> On 11/5/2016 12:32 PM, omniverse wrote:
>>> I was going to see if I could find something else similar
>>
>> I remember a video made with a patched version of povray from years ago.
>> I have never been able to find it again.
>> But using the wayback machine you can download the source code here
>>
>>
https://web.archive.org/web/19970220101552/http://www.cs.mu.oz.au/~andrbh/raytrace/raytrace_source.html
>
> Just 722 kByte in 46 source code files? With makefiles and all?
>
> Wow -- if only modern POV-Ray was that lean ;)

I am sure you could do better. ÜbertreibenPov?


-- 

Regards
     Stephen


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