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29 Mar 2024 07:33:16 EDT (-0400)
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From: Kontemplator
Subject: Re: Cloud Surface
Date: 24 Nov 2017 14:05:01
Message: <web.5a186c9e9a2a53c19ae32810@news.povray.org>
simple example image for a cloud surface to start with

Scene file at
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2a53c19ae32810%40


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cloud_surface.png


 

From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 24 Nov 2017 14:56:03
Message: <5a187953$1@news.povray.org>
On 24.11.2017 14:03, Kontemplator wrote:
> simple example image for a cloud surface to start with
> 
> Scene file at
> http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2
a53c19ae32810%40
> 
Yes, that cloud looks good enough for my needs! Thanks a lot!

But here's one more question: I don't want the cloud surface to be flat
like a plane. Is there any way, to get it slightly rounded, like it
follows the round shape of a planet? I want to see, at a vast distance,
the horizon, that's why.

---

http://www.avg.com


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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 24 Nov 2017 18:36:59
Message: <5a18ad1b@news.povray.org>
On 24.11.2017 14:03, Kontemplator wrote:
> simple example image for a cloud surface to start with
> 
> Scene file at
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5a186b419a2a53c19ae32810%40
> 
Have a look at the a:

I am quite happy with the shape of the clouds, but there are some things
where I don't know how to change:
- that the tower disappears slowly below cloud surface (now it is white)
- that the tower puts its gentle smooth shadow on the clouds
- that the clouds are lilac in shadow and remain pink in light
- and pink (as now) in the illuminated areas

Any suggestions?


---

http://www.avg.com


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Attachments:
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sl - cloud cities.jpg


 

From: clipka
Subject: Re: Cloud Surface
Date: 24 Nov 2017 18:51:02
Message: <5a18b066$1@news.povray.org>
Am 25.11.2017 um 00:36 schrieb Sven Littkowski:

> I am quite happy with the shape of the clouds, but there are some things
> where I don't know how to change:
> - that the tower disappears slowly below cloud surface (now it is white)

Make sure to use scattering media with an extinction value of 1.0.

Also, do use the newest version of POV-Ray, and do use the default media
sampling method (2 I think). Media has seen several fixes of the
underlying math, some of which could not be applied to the older
sampling methods.


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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 24 Nov 2017 18:54:41
Message: <5a18b141$1@news.povray.org>
I forgot to post the scene code:
------------------------------------------

#version 3.7;

global_settings
{
 assumed_gamma 1.0

}
#default
{
 finish { ambient 0.0 diffuse 0.0 }
}

//------------------------------------------------------------------------
#include "colors.inc"
#include "textures.inc"
#include "glass.inc"
#include "metals.inc"
#include "golds.inc"
//------------------------------------------------------------------------
camera
{
 /*ultra_wide_angle*/ angle 20   // diagonal view
 location  < -20.0 , 15.0 ,-00.0 >
 right     x*image_width/image_height
 look_at   < 0.0 , 2 , 0.0 >
}
//------------------------------------------------------------------------
// sun -------------------------------------------------------------------
light_source { < 250, 100, -250 > color < 1.0,  0.62353,  0.46667 > *5 }
// sky
-------------------------------------------------------------------

sky_sphere
{
 pigment
 {
  gradient < 0, 1, 0 >
  color_map
  {
   [ 0.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
   [ 0.4 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
   [ 0.6 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
   [ 1.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
  }
  scale 2
 }
}

//------------------------------------------------------------------------


// ground -----------------------------------------------------------------

//---------------------------------<<< settings of squared plane dimensions



plane
{
 < 0, 1, 0 >, 0
 texture { pigment { color rgb < 0.24706,  0.38431,  0.058824 > *1.0 }
 finish { ambient 0.0 diffuse 0.0 } }
 rotate< 0, 0, 0 >
}
//------------------------------------------------ end of squared plane XZ

//-------------------------------------------------------------------------
-
//---------------------------- objects in scene ---------------------------
-

box
{
 < -1.0, -0.5, -1.0 > < 1.0, 1.0, 1.0 >
 texture { T_Copper_1A }
 pigment{ rgbt < 0.20784,  0.19216,  0.25098, 1.0 > }
 finish { reflection 0.5 }
 hollow
 interior
 {
  media
  {
   emission < 0.9, 0.9, 1.0 > *1.5
   absorption < 0.0, 0.0, 0.5 >
   scattering
   {
    3, < 1.0, 1.0, 1.0 >
    extinction  2.0
   }
   density
   {
    gradient < 1.0, 0.25, 0.5 >  // controls the cloud formation
    turbulence 0.5
    frequency 5
    color_map
    {
     [ 0.0 rgb 0.0 ]//border
     [ 0.5 rgb 0.1 ]
     [ 1.0 rgb 1.0 ]//center
    } // end color_map
   } // end of density
  } // end of media ----
 } // end of interior
 translate < 0.0, 1.0, 0.0 >
 scale < 5.0, 1.5, 5.0 >
}

fog
{
 fog_type   2
 distance   2
 color rgb < 0.20784,  0.192160,  0.2509800 > *0.8 // Purple
 color rgb < 0.49020,  0.058824,  0.0078431 > *0.8 // Blood Red
 fog_offset 0.1
 fog_alt    1.25
 turbulence 1.8
}

cylinder
{
 < 0.0, 0.0, 0.0 > < 0.0, 4.0, 0.0 > 0.25
 texture { T01 }
 texture { T_Copper_1A }
}

sphere
{
 < 0.0, 4.0, 0.0 > 0.25
 texture { T01 }
 texture { T_Copper_1A }
}

---

http://www.avg.com


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From: Stephen
Subject: Re: Cloud Surface
Date: 24 Nov 2017 19:18:38
Message: <5a18b6de$1@news.povray.org>
On 24/11/2017 23:36, Sven Littkowski wrote:
> - that the tower puts its gentle smooth shadow on the clouds

Are you sure that is a shadow? It is in the right area for a reflection.

-- 

Regards
     Stephen


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From: Sven Littkowski
Subject: Re: Cloud Surface
Date: 24 Nov 2017 20:30:42
Message: <5a18c7c2$1@news.povray.org>
On 24.11.2017 19:18, Stephen wrote:
> On 24/11/2017 23:36, Sven Littkowski wrote:
>> - that the tower puts its gentle smooth shadow on the clouds
> 
> Are you sure that is a shadow? It is in the right area for a reflection.
> 
You misunderstand me. I want to know, how to make the tower creating a
soft, gentle shadow on the clouds.


---

http://www.avg.com


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From: Alain
Subject: Re: Cloud Surface
Date: 24 Nov 2017 21:41:40
Message: <5a18d864@news.povray.org>

> I forgot to post the scene code:
> ------------------------------------------
> 
> #version 3.7;
> 
> global_settings
> {
>   assumed_gamma 1.0
> 
> }
> #default
> {
>   finish { ambient 0.0 diffuse 0.0 }
> }
> 
> //------------------------------------------------------------------------
> #include "colors.inc"
> #include "textures.inc"
> #include "glass.inc"
> #include "metals.inc"
> #include "golds.inc"
> //------------------------------------------------------------------------
> camera
> {
>   /*ultra_wide_angle*/ angle 20   // diagonal view
>   location  < -20.0 , 15.0 ,-00.0 >
>   right     x*image_width/image_height
>   look_at   < 0.0 , 2 , 0.0 >
> }
> //------------------------------------------------------------------------
> // sun -------------------------------------------------------------------
> light_source { < 250, 100, -250 > color < 1.0,  0.62353,  0.46667 > *5 }
> // sky
> -------------------------------------------------------------------
> 
> sky_sphere
> {
>   pigment
>   {
>    gradient < 0, 1, 0 >
>    color_map
>    {
>     [ 0.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
>     [ 0.4 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
>     [ 0.6 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
>     [ 1.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
>    }
>    scale 2
>   }
> }
> 
> //------------------------------------------------------------------------
> 
> 
> // ground -----------------------------------------------------------------
> //---------------------------------<<< settings of squared plane dimensions
> 
> 
> plane
> {
>   < 0, 1, 0 >, 0
>   texture { pigment { color rgb < 0.24706,  0.38431,  0.058824 > *1.0 }
>   finish { ambient 0.0 diffuse 0.0 } }
>   rotate< 0, 0, 0 >
> }
> //------------------------------------------------ end of squared plane XZ
> 
> //--------------------------------------------------------------------------
> //---------------------------- objects in scene ----------------------------
> 
> box
> {
>   < -1.0, -0.5, -1.0 > < 1.0, 1.0, 1.0 >
>   texture { T_Copper_1A }
>   pigment{ rgbt < 0.20784,  0.19216,  0.25098, 1.0 > }
>   finish { reflection 0.5 }
>   hollow
>   interior
>   {
>    media
>    {
>     //emission < 0.9, 0.9, 1.0 > *1.5 remove
>     //absorption < 0.0, 0.0, 0.5 > probably not needed
>     scattering
>     {
>      3, < 1.0, 1.0, 1.0 >
>      extinction  2.0
//Should be 1.0 to be acurate
>     }
>     density
>     {
>      gradient < 1.0, 0.25, 0.5 >  // controls the cloud formation
>      turbulence 0.5
>      frequency 5
>      color_map
>      {
>       [ 0.0 rgb 0.0 ]//border
>       [ 0.5 rgb 0.1 ]
>       [ 1.0 rgb 1.0 ]//center
>      } // end color_map
>     } // end of density
>    } // end of media ----
>   } // end of interior
>   translate < 0.0, 1.0, 0.0 >
>   scale < 5.0, 1.5, 5.0 >
> }
> 
> fog
> {
>   fog_type   2
>   distance   2
>   color rgb < 0.20784,  0.192160,  0.2509800 > *0.8 // Purple
>   color rgb < 0.49020,  0.058824,  0.0078431 > *0.8 // Blood Red
>   fog_offset 0.1
>   fog_alt    1.25
>   turbulence 1.8
> }
fog never interact with your light. It just add it's colour over some 
distance.
Quick and fast and dirty hack from before media was introduced.
Remove that fog.

> 
> cylinder
> {
>   < 0.0, 0.0, 0.0 > < 0.0, 4.0, 0.0 > 0.25
>   texture { T01 }
>   texture { T_Copper_1A }
> }
> 
> sphere
> {
>   < 0.0, 4.0, 0.0 > 0.25
>   texture { T01 }
>   texture { T_Copper_1A }
> }
> 
> ---

> http://www.avg.com
> 

If your media is not present enough, just increase it's density.


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From: Alain
Subject: Re: Cloud Surface
Date: 24 Nov 2017 21:44:17
Message: <5a18d901$1@news.povray.org>

> On 24.11.2017 19:18, Stephen wrote:
>> On 24/11/2017 23:36, Sven Littkowski wrote:
>>> - that the tower puts its gentle smooth shadow on the clouds
>>
>> Are you sure that is a shadow? It is in the right area for a reflection.
>>
> You misunderstand me. I want to know, how to make the tower creating a
> soft, gentle shadow on the clouds.
> 
> 
> ---

> http://www.avg.com
> 

Remove that emissive madis and that fog.
Both are killing the shadow.


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From: Stephen
Subject: Re: Cloud Surface
Date: 24 Nov 2017 23:04:54
Message: <5a18ebe6@news.povray.org>
On 25/11/2017 01:30, Sven Littkowski wrote:
> On 24.11.2017 19:18, Stephen wrote:
>> On 24/11/2017 23:36, Sven Littkowski wrote:
>>> - that the tower puts its gentle smooth shadow on the clouds
>>
>> Are you sure that is a shadow? It is in the right area for a reflection.
>>
> You misunderstand me. I want to know, how to make the tower creating a
> soft, gentle shadow on the clouds.
> 

You are right I did. Alain's post should do it.

-- 

Regards
     Stephen


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