In this version, adding a non-zero reflection to the hexagon plane makes
the intended invisible heat-haze plane noticeable.

... The question is, why?

That part of the heat-haze plane should be completely transparent and
has only a negligible ior of 1.01. (The ior 1.01 is needed for POVRay to
have to normals modifiers take effect.)

The little chunk of code is:


light_source { <500,1000,-750> color rgb <1,1.1,1.125>}
light_source { <-25,150,50> color rgb <.5,.33,.25> shadowless}

camera
{
  location  <0,7.5,-30>
  angle 34
  look_at   <0,5.75,0>
  rotate -5*y
}


// a heat-haze effect

#declare HotWave=
texture {pigment {rgbf 0.97} finish{reflection 0} normal {wrinkles 0.4}
scale <0.0011,0.07,0.1>}

#declare CoolWave=
texture {pigment {rgbf 0.99} finish{reflection 0} normal {wrinkles 0.1}
scale <0.0017,0.05,0.15>}

#declare NoWave=
texture {pigment {rgbf 1} finish{reflection 0 ambient 0} normal
{wrinkles 0}}


plane {-z, 0
      material {          
        texture {gradient y
          texture_map {
                [.00 NoWave]
                [.02 NoWave]
                [.11 HotWave]
                [.23 CoolWave]
                [.33 CoolWave]
                [.45 NoWave]
          }
          scale <1,55,1>
        }
        interior {ior 1.01}
      }
      rotate 66*x
      translate 7*z
      translate 44*x
}


plane{
  y, 0.12
  texture{ hexagon
    texture{
      pigment{ color rgb <0.5, 0.2, 0.1> }
      finish { crand 0.15  ambient .5  phong 0.7  reflection 0.27 }
    },
    
    texture{
      pigment{ color rgb <0.2, 0.2, 0.5> }
      finish { crand 0.00  ambient .3  phong 0.3  reflection 0.40 }
    }, 
    
    texture{
      pigment{ color rgb 0.5 }
      // A non-zero reflection value here shows the heat-haze plane!
      finish {  crand 0.05  ambient .50   phong 1  reflection 0.43 }
    }
    
    scale 7.99   
  }
} 

#include "colors.inc"
#include "skies.inc"
sky_sphere {S_Cloud2}

 
-- 
----------------
Martin Lomas
mar### [at] ml1couk
----------------

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Attachments:
Download 'galileo thermometer 05 cr.jpg' (82 KB)

Preview of image 'galileo thermometer 05 cr.jpg'

Try putting diffuse 0 into the haze plane finishes.  Thing about reflections
(and specular highlights) is that regardless of transparency the object will
tend to show.

I see that the lathe/camera defect is there, aligned where the camera height
is at.  Wish that were preventable, other than moving the camera away from
any intersecting plane.
I've redone that scene file to be more of the actual thermometer I got for
Christmas, I wasn't modelling it directly from the real thing before.
Should I repost that?  It never got completed...

Bob H.

"ml" <paz### [at] unixcccnottinghamacuk> wrote in message
news:3AF### [at] unixcccnottinghamacuk...
> In this version, adding a non-zero reflection to the hexagon plane makes
> the intended invisible heat-haze plane noticeable.
>
> ... The question is, why?

Post a reply to this message

"Bob H." wrote:
> 
> Try putting diffuse 0 into the haze plane finishes.  Thing about 
> reflections (and specular highlights) is that regardless of 
> transparency the object will tend to show.

... And that was the one parameter I missed!...

> 
> I see that the lathe/camera defect is there, aligned where the camera 
> height is at.  Wish that were preventable, other than moving the 
> camera away from any intersecting plane.

And then spoiling the intended perspective. I guess two lathes and a
cylinder could be used instead. Or the next version of POV to fix it.
However, other doodlings are in progress at present.

> I've redone that scene file to be more of the actual thermometer I got 
> for Christmas, I wasn't modelling it directly from the real thing 
> before. Should I repost that?  It never got completed...
> 

For the sake of curiosity, the incomplete version, posted or emailed
would be of interest.

Martin.


-- 
----------------
Martin Lomas
mar### [at] ml1couk
----------------

Post a reply to this message

ml wrote:

> >
> > I see that the lathe/camera defect is there, aligned where the camera
> > height is at.  Wish that were preventable, other than moving the
> > camera away from any intersecting plane.
> 
> And then spoiling the intended perspective. I guess two lathes and a
> cylinder could be used instead. Or the next version of POV to fix it.
> However, other doodlings are in progress at present.

Have you tried the sturm keyword on the lathe ?
It may be slower, but better...

Or given the current view, replace the lathe with two lathes and
one cylinder...

Post a reply to this message

news:3AFA60A0.ADF4D493@atosorigin.com...
> > >
> > > I see that the lathe/camera defect is there, aligned where the camera
> > > height is at.  Wish that were preventable, other than moving the
> > > camera away from any intersecting plane.
>
> Have you tried the sturm keyword on the lathe ?
> It may be slower, but better...

It helps a little but certainly not a cure.

Bob H.

Post a reply to this message

I tried e-mailing the pov file to you, it returned undelivered.  Used the
address at the bottom of your message, not the other one I see in this
replies header, as follows:

"ml" <paz### [at] unixcccnottinghamacuk> wrote in message

Should I retry using that one?  Well I will anyhow, no trouble to do so.

Bob H.

Post a reply to this message

"ml" <paz### [at] unixcccnottinghamacuk> wrote in message
news:3AF985F5.4498D55E@unix.ccc.nottingham.ac.uk...
> For the sake of curiosity, the incomplete version, posted or emailed
> would be of interest.

I gave up e-mailing it and uploaded to a web space.

http://webpages.charter.net/omniverse/gthermmp7.txt

Even the direct reply back to your address returned the following:

This message was created automatically by mail delivery software (Exim).

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  paz### [at] unixcccnottinghamacuk
    probably spam

Funny thing is, I can't figure what it must be seeing in my address (msn
maybe?:-)) or subject lines that would be filtered.  Oh well, there's no
need to know why anymore.

Bob H.

Post a reply to this message

>
> "ml" <paz### [at] unixcccnottinghamacuk> wrote in message
>
Ooooh, someone from Cripps Computing Centre, I graduated 2 years ago from
Nottingham University so know the place well. I'll be back there in 2 weeks
to help some friends celebrate their exams, can't wait.

Kev
--
http://perso.libertysurf.co.uk/kevin.ellis

Post a reply to this message

Kevin Ellis wrote:

> Ooooh, someone from Cripps Computing Centre, ...
> I'll be back there in 2 weeks
> to help some friends celebrate their exams, can't wait.
> 
> Kev
> --
> http://perso.libertysurf.co.uk/kevin.ellis

Eeeeeeeee, Does this mean a party and lots o' beer?...

-- 
----------------
Martin Lomas
mar### [at] ml1couk
----------------

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"Bob H." wrote:
>
 
> This message was created automatically by mail delivery software > (Exim).

> A message that you sent could not be delivered to one or more of its
> recipients. This is a permanent error. The following address(es) > failed:

>  paz### [at] unixcccnottinghamacuk
>    probably spam

> Funny thing is, I can't figure what it must be seeing in my address
> (msn maybe?:-))

Mmmmmm...

Looks like some spammmer has blackened your address or routing here.
Also, there is automatic anti-virus software running on the servers that
dump any 'suspicious' attachments... All very dumb stuff to catch the
99% (or 101% :-( of spam & grot.

Thanks, got the web uploaded version ok.

This poor 233MHz K6 can be made to suffer soon (:->>)

Martin.

-- 
----------------
Martin Lomas
mar### [at] ml1couk
----------------

Post a reply to this message