In article <38791f53@news.povray.org>, "Nathan Kopp" <Nat### [at] Koppcom> 
wrote:

> There are two concepts here.  One is the portal (hologram), the other is 
> the camera.  They would have to work differently, I think.

Good point, if you made a security camera monitor using the portal 
pigment, the areas visible through it would change as you moved around 
the monitor.
One possible solution would be a pigment which would take the same 
information the camera takes. This would probably have to render the 
scene from the point of view of the target position and use that as an 
image map(internally). While this would be very useful, it might be 
quite difficult to code.

I would be satasfied with the portal pigment. Image maps could be used 
for security monitors.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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'looking_glass', I kinda like that one, even if it is a bit off the beaten path.
I get what you mean and 'magic_mirror' kind of fits that too.

Bob

"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-2BCC4E.18352709012000@news.povray.org...
> I meant that having it be a portal to a separate scene file wouldn't be
> any more useful than being a portal to another part of the main scene.
> You could make it "link" to a portion of the scene that is out of sight
> instead.
>
> looking_glass
>

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I just realized this is the multi-camera concept brought up more than once
before.

Bob

"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-63B0A7.19194709012000@news.povray.org...
> In article <38791f53@news.povray.org>, "Nathan Kopp" <Nat### [at] Koppcom>
> wrote:
>
> > There are two concepts here.  One is the portal (hologram), the other is
> > the camera.  They would have to work differently, I think.
>
> Good point, if you made a security camera monitor using the portal
> pigment, the areas visible through it would change as you moved around
> the monitor.
> One possible solution would be a pigment which would take the same
> information the camera takes. This would probably have to render the
> scene from the point of view of the target position and use that as an
> image map(internally). While this would be very useful, it might be
> quite difficult to code.
>
> I would be satasfied with the portal pigment. Image maps could be used
> for security monitors.
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/

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Oh! Now I get it! (Please don't talk about rays that go somewhere, just say
"camera"). OK. In that case, "portal" sounds good enough to me.

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Chris Huff wrote:
> 
> In article <38791f53@news.povray.org>, "Nathan Kopp" <Nat### [at] Koppcom>
> wrote:
> 
> > There are two concepts here.  One is the portal (hologram), the other is
> > the camera.  They would have to work differently, I think.
> 
> Good point, if you made a security camera monitor using the portal
> pigment, the areas visible through it would change as you moved around
> the monitor.

Hence flaten Key word with extra angle. which i forgot to mention
in the first post. However it does require an addition to both
Trace(.., MaxDepth) and Compute_Pigment(..., Ray)

They would work differntly.. but only by calculation of 
the ray to trace other wise the other configurations 
can be applied to each type.


-- 
Matthew Corey Brown                                         XenoArch
mcb### [at] xenoarchcom                             http://www.xenoarch.com

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Chris Huff <chr### [at] yahoocom> wrote...
> One possible solution would be a pigment which would take the same
> information the camera takes. This would probably have to render the
> scene from the point of view of the target position and use that as an
> image map(internally). While this would be very useful, it might be
> quite difficult to code.

Actually, there is a very nice function called create_ray() in render.c that
would make this relatively easy, with no need to use an internal image map.

-Nathan

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In article <38794ffc@news.povray.org>, "Nathan Kopp" <Nat### [at] Koppcom> 
wrote:

> Chris Huff <chr### [at] yahoocom> wrote...
> > One possible solution would be a pigment which would take the same
> > information the camera takes. This would probably have to render the
> > scene from the point of view of the target position and use that as an
> > image map(internally). While this would be very useful, it might be
> > quite difficult to code.
> 
> Actually, there is a very nice function called create_ray() in render.c 
> that
> would make this relatively easy, with no need to use an internal image 
> map.

How would it handle the projection? Since it is being projected onto an 
arbitrary object, not necessarily a flat screen plane.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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Chris Huff <chr### [at] yahoocom> wrote...
> How would it handle the projection? Since it is being projected onto an
> arbitrary object, not necessarily a flat screen plane.

I would use a syntax as a mix between image_map and camera.  You'd specify a
bunch of camera options, and then image_map options.  The image_map options
would determine the mapping (which determines the x and y values that), and
the camera options would determine how the new ray that was created (by
calling create_ray with those x and y values).  Then, you'd just have to
trace the ray that create_ray created.

-Nathan

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Chris Huff <chr### [at] yahoocom> wrote:
: Good point, if you made a security camera monitor using the portal 
: pigment, the areas visible through it would change as you moved around 
: the monitor.

  Not if you make the ray to go always in the same direction, independently
of the direction of the incoming ray.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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I am thinking mirage would be fairly descriptive. This does pretty much
what they do. Bends the view to see something that you can't see
from where you are.

Chris Huff wrote:
> 
> In article <3878EA1A.7B5E34A7@pacbell.net>, lin### [at] povrayorg
> wrote:
> 
> > Portal sound more like an object identifier than a pattern modifier or
> > type.
> >
> >  How about "Transwarp" ?
> >
> > It has a catchy ring to it and is moderately descriptive of the process.
> 
> I still prefer "portal", it is more descriptive of what the pigment does
> than "transwarp". An object with this pigment will act like a portal to
> another part of space.
> 
> A couple other possibilties:
> wormhole
> mirage
> gateway
> space_time_bending_thingammajiggy_pigment :-)
> 
> One thing that might be even more interesting would be a pigment that
> takes a scene file as a parameter. Both scene files would be parsed, and
> a ray could travel from one scene into the other through objects with
> the portal pigment. Of course, this would require extensive
> modifications to the code, and wouldn't be much more useful(if at all)
> than just one scene.
> 
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/

-- 
Mr. Art

"Often the appearance of reality is more important 
than the reality of the appearance."
Bill DeWitt 2000

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