Sally nous apporta ses lumieres ainsi en ce 2004/05/18 20:17... :

>On a related note, how do you get distance information from a regular
>povray scene?
>
>
>  
>
Remove all lights, all textures.
Remove any radiosity, photons and focal blur.
Bind everything in a single union.
Apply a gradient z texture, black on the far end, white on the near end, 
ambient 1.
Extra: use the hf_gray_16 option and you are set to do stereogram or 
hight_field.
It renders prety fast.

Alain

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"Gilles Tran" <gitran_nospam_@wanadoo.fr> wrote in message
news:40aa6096@news.povray.org...
>

Is there something up with your clock or is it OE at my end? (I'm seeing a
9/5/2004 post in reply to a post on 18/5/2004)

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news:40ab867e@news.povray.org...
> "Gilles Tran" <gitran_nospam_@wanadoo.fr> wrote in message
> news:40aa6096@news.povray.org...
> >
>
> Is there something up with your clock or is it OE at my end? (I'm seeing a
> 9/5/2004 post in reply to a post on 18/5/2004)

What happened is that the last beta expired last night, so I had to set the
clock back to have it work again, and I forgot to change it back before
posting... I guess it's going to happen a few times until a new version is
out...

G.


-- 
**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters

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In article <40ab308c$1@news.povray.org>, Alain <aze### [at] qwertygov> 
wrote:

> Apply a gradient z texture, black on the far end, white on the near end, 
> ambient 1.

Only if you are using an orthographic camera. For most other camera 
types, use a spherical pattern centered on the camera. You could also 
use an entirely white texture and black fog...this should work 
regardless of the camera type, but won't give a linear mapping.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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Hey, thanks guys, and sorry for the late reply. I'm hopefully going to
use a mixture of Ingos and Alains methods.

 I'm starting to get some half decent results with my test image, but
it's not quite right yet. I'll post something in p.b.i as soon as I
can.

 I ended up trying:

  texture{
  pigment {rgbt 1}
  normal {wrinkles warp {turbulence .8 omega .7}}
  finish {roughness 0.8 }}

 for my clear model, but the model is not good at the moment. I'll
keep trying. Is there
anything in the above that I should change though?

 I've read the docs but still don't understand 'omega'.

  ~Steve~

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St. nous apporta ses lumieres ainsi en ce 2004/05/20 13:58... :

>Hey, thanks guys, and sorry for the late reply. I'm hopefully going to
>use a mixture of Ingos and Alains methods.
>
> I'm starting to get some half decent results with my test image, but
>it's not quite right yet. I'll post something in p.b.i as soon as I
>can.
>
> I ended up trying:
>
>  texture{
>  pigment {rgbt 1}
>  normal {wrinkles warp {turbulence .8 omega .7}}
>  finish {roughness 0.8 }}
>
> for my clear model, but the model is not good at the moment. I'll
>keep trying. Is there
>anything in the above that I should change though?
>
> I've read the docs but still don't understand 'omega'.
>
>  ~Steve~
>
Turbulence is repeated a few times controled by the octaves value
The omega value reduce the effective effect of the subsequent moves. 
Supose that the first move was 1 unit long and omega is set to 0.5 
(default), then move 2 is 0.5 unit, move 3 is 0.25 unit, move 4 is 0.125 
unit,...
Increasing the omega value will increase the disturbance caused by 
higher octaves ranks.
In your case, the effects are: 1, 0.7, 0.49, 0.343, 0.2401, and 0.16807 
time the base one.

Alain

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There's a couple of examples in povray.binaries.animations - look for "Heat
Waves".

There's also a post of mine in povray.animations called "Heat Shimmer" that
sort of started the other posts.

The best IMHO is:
----- Original Message ----- 
From: "Jan Walzer" <jan### [at] lzernet>
Newsgroups: povray.binaries.animations
Sent: Tuesday, July 16, 2002 06:22
Subject: Heatwaves #3 [divX]

but there wasn't a reply on how Jan did it

        == John ==

"St." <dot### [at] dotcom> wrote in message news:40aa56b7@news.povray.org...
> Can this be done with Pov? I would imagine that focal_blur could/would
> be used, but how would you produce that undulating, blurred, wavy
> effect behind your scene?
>
>  Any ideas?
>
>  ~Steve~
>
>
>

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Actually, I take back what I said, here's how Jan did it:


"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3d30c80a@news.povray.org...
> this is only a quick hack I did, when I saw the post of Tom A.
>
> I don't know, how fast his ISO solution renders, but I used
> a version, that uses transparent spheres around the camera,
> "only" with a normalmap.
>
> The MPG is killig a lot details here, I've to admit this
> version isn't yet, what I'm after.
> But I've currently a version running, with better params, that will
> be ready in some hours, so I can post it tomorrow.
>

Post a reply to this message

"John D. Gwinner" <joh### [at] cornelledu> wrote in message
news:40b5101c$1@news.povray.org...
> There's a couple of examples in povray.binaries.animations - look
for "Heat
> Waves".
>
> There's also a post of mine in povray.animations called "Heat
Shimmer" that
> sort of started the other posts.

     Hi John, thanks very much for that - I don't usually check the
animations group. It lead me to Tom Aust's piece of isosurface code
which I'm playing with now, (thanks Tom). It needs a lot of tweaking
to get it right for what I want to do, but it's looking very
promising.  :)

       ~Steve~

>         == John ==

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"St." <dot### [at] dotcom> wrote in message news:40b86e4a@news.povray.org...
>
>      Hi John, thanks very much for that - I don't usually check the
> animations group. It lead me to Tom Aust's piece of isosurface code
> which I'm playing with now, (thanks Tom). It needs a lot of tweaking
> to get it right for what I want to do, but it's looking very
> promising.  :)
>

No problem, I'd be interested in what you come up with.

What I was trying to do was vehicle exhaust, and I never solved it.  This
particular exhaust was pointed straight up (more of a cooling tower than
vehicle exhaust, actually).  I made some fitfull attempts with 'liquid
spray' pointed straight up, to make the cone shape, but it never look right,
but I didn't mess with it that much.

Ironically my vehicles ended up on Mars, so now I don't have to worry about
exhaust.  But it would be nice to relocated them someday, I'm sure the crews
would like to go home!


        == John ==

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