For a long time I used POV-Ray 2.2 and was very happy - nice thing. I
created a lot of realistic- looking sky-spheres for my pictures. I spent
a lot of time to find the right parameters for the clouds (using marble,
leopard, or something else), and I was quite happy with it. Then I
changed to version 3.02 (because of some nice features) and nothing
looks as it did before. 

What happened? I guess the routines for creating the textures changed.
But what can I do to get my old skies and keep the new neat features???

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Eiko Thiessen wrote:

> For a long time I used POV-Ray 2.2 and was very happy - nice thing. I
> created a lot of realistic- looking sky-spheres for my pictures. I spent
> a lot of time to find the right parameters for the clouds (using marble,
> leopard, or something else), and I was quite happy with it. Then I
> changed to version 3.02 (because of some nice features) and nothing
> looks as it did before.
>
> What happened? I guess the routines for creating the textures changed.
> But what can I do to get my old skies and keep the new neat features???

  Can you provide an example of one of your textures that is no longer
working right. There were no major differences introduced in 3.02
that would be causing you problems. I would be happy to look at your
non working texture and offer some advice.

K.Tyler

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Eiko Thiessen wrote in message <35E### [at] phcuni-kielde>...
>For a long time I used POV-Ray 2.2 and was very happy - nice thing. I
>created a lot of realistic- looking sky-spheres for my pictures. I spent
>a lot of time to find the right parameters for the clouds (using marble,
>leopard, or something else), and I was quite happy with it. Then I
>changed to version 3.02 (because of some nice features) and nothing
>looks as it did before.
>
>What happened? I guess the routines for creating the textures changed.
>But what can I do to get my old skies and keep the new neat features???


If the problem is with the colors (and not the patterns), it can be the
gamma settings, which was introduced with pov3. It's in the doc
somewhere...

If the problem is with the patterns, it could the ordering of textures and
objects transformations, as I think pov's behaviour changed for this from
v2 to v3.


I hope this helps,


Philippe

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Hi Eiko.

There was a bug in povray 2.x in the pseudo-random number generator used for
turbulence, bozo, agate etc. This bug has been fixed in 3.x, but if you were
using POV-Ray 2.2 on an non-unix machine the textures will most probably
differ. Anyway, if this is the problem, the way they look in 3.x is the way
they should look, though I know this isn't of much help.

Regards,

Peter

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K. Tyler wrote:
> 
>   Can you provide an example of one of your textures that is no longer
> working right. There were no major differences introduced in 3.02
> that would be causing you problems. I would be happy to look at your
> non working texture and offer some advice.
> 
> K.Tyler

The version 2.2 of POV-Ray was producing clouds with the following code
that looked more like fleecy clouds. Someone could say that it still
looks good, but it is not the same and I liked the old one.
And what is more the waves are heading to a different direction. What is
going on here?
It drives me to despair.

Nevertheless, thank you for thinking about it.

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Eiko Thiessen wrote:

> The version 2.2 of POV-Ray was producing clouds with the following code
> that looked more like fleecy clouds. Someone could say that it still
> looks good, but it is not the same and I liked the old one.
> And what is more the waves are heading to a different direction. What is
> going on here?
> It drives me to despair.
>
> Nevertheless, thank you for thinking about it.
>
> /* a few clouds */
> sphere { <0, 0, 0>, 4900 scale <1,0.075,1>
>   pigment{
>     granite
>     turbulence 0.1
>     color_map {
>        [ 0.0 color Clear ]
>        [ 0.3 color Clear ]
>        [ 1.0 color White ]
>     }
>     scale 1000
>   }
>   finish {ambient 0.7 diffuse 0}
> }

I did a render of your scene in both Pov 2.2 and 3.1beta6b
and you are correct. There is a difference. As was suggested
in the other posts to you question your bug is being caused
by a bug fix. I made one minor change to your clouds by
scaling it differently. Your fleecy clouds while not exactly
like they were are now back to being fleecy. Compare the
code above to the code below.
    Remember that there are many options available for
changing the way a pigment pattern can be manipulated.
Everything from 3 vector turbulence, to 3 vector scaling,
to the use of octaves, using frequency, wrapping several
pigments into a texture map, and many, many, more.


I can't say about the waves problem because I was
concentrating on the clouds and forgot about the
waves. Probably another victim of the bug fixes.
One thing though I think your blue is a little too blue.

The fun and challenge of using Pov is the ever evolving
nature of it.

Good luck.

K.Tyler

/* a few clouds */
sphere { <0, 0, 0>, 4900 scale <1,0.075,1>
  pigment{
    granite
    turbulence 0.1
    color_map {[ 0.0 color Clear ][ 0.3 color Clear ][ 1.0 color White ]}
    scale<1000,1300,1000>} // Changed from "scale 1000"
  finish {ambient 0.7 diffuse 0}}

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