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One question that will likely come up in the FLOSS interview on
Wednesday is how POV-Ray renders clouds. I have an answer from when I
used to write cloud textures years ago - procedural textures with shades
of gray and transparency and a gradient sphere.
Is there a better more modern way to create spectacular clouds? Many of
the clouds I'm seeing seem to go beyond the simple texturing technique I
used to use.
Thanks
David Buck
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David Buck nous apporta ses lumieres en ce 2008/02/04 11:41:
> One question that will likely come up in the FLOSS interview on
> Wednesday is how POV-Ray renders clouds. I have an answer from when I
> used to write cloud textures years ago - procedural textures with shades
> of gray and transparency and a gradient sphere.
>
> Is there a better more modern way to create spectacular clouds? Many of
> the clouds I'm seeing seem to go beyond the simple texturing technique I
> used to use.
>
> Thanks
> David Buck
Volumetric clouds using scattering media.
--
Alain
-------------------------------------------------
Lutheran: If shit happens, don't talk about it.
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one simpler and cost-effective way to render better clouds than simple textures
is the so-called stacked sky technique as employed by Jaime Vives Piqueres:
http://www.ignorancia.org/en/index.php?page=Stacked_Planes
not as impressive as true scattering media clouds, but insanely faster! And
much better looking than just single texture.
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David Buck skribis:
> Is there a better more modern way to create spectacular clouds? Many of
> the clouds I'm seeing seem to go beyond the simple texturing technique I
> used to use.
Project Tierra, an automated landscape generation macro by Jaime Vives Piqueres
has the most beautiful clouds I've ever seen in POV-ray. It contains macros for
both cumulus and cirrus clouds, and the basic technique for creating one cloud
is this (if I read the code correctly).
1. Creating a union of spheres randomly jittered about a central point.
2. Using this union object as a pigment function. (Inside = 1, outside = 0)
3. Adding some turbulence for fluffiness.
4. Using the resulting function as a density function for a scattering medium.
See for yourself at:
http://www.ignorancia.org/en/index.php?page=Project_Tierra
Personally, I like this macro so much I want to have sex with it.
Hymyly.
And there was light.
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"Hymyly" <chr### [at] hotmail com> wrote:
> Personally, I like this macro so much I want to have sex with it.
whoa! You sure know this guy has been raytracing too long! :D
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"David Buck" <dav### [at] simberoncom> wrote in message
news:47a7404c$1@news.povray.org...
> One question that will likely come up in the FLOSS interview on Wednesday
> is how POV-Ray renders clouds. I have an answer from when I used to write
> cloud textures years ago - procedural textures with shades of gray and
> transparency and a gradient sphere.
>
> Is there a better more modern way to create spectacular clouds? Many of
> the clouds I'm seeing seem to go beyond the simple texturing technique I
> used to use.
I tend to use my own fastclouds macro, which uses a texturing technique that
is slightly more complicated than the with povray included cloud-textures.
some examples:
http://www.povplace.com/gallery/Experiments/newfastclouds.jpg
http://www.povplace.com/gallery/Experiments/flares_test1.jpg
It's not as goodlooking, or as flexible as volumetric clouds, even stacked
planes look better (or stacked spheres, as I used here:
http://www.povplace.com/gallery/IRTC/zee.jpg ), but it renders a LOT faster
:)
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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"Zeger Knaepen" <zeg### [at] povplacecom> wrote:
> http://www.povplace.com/gallery/IRTC/zee.jpg ), but it renders a LOT faster
oh! I've seen this scene before... very good looking... stacked spheres?!
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nemesis escribió:
> stacked spheres?!
Concentric, I guess.
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David Buck <dav### [at] simberoncom> wrote:
> Is there a better more modern way to create spectacular clouds?
Everyone mentions volumetric clouds, but nobody gives an example,
so here's one:
http://www.oyonale.com/image.php?lang=en&mode=info&code=432§ion=2003
--
- Warp
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"Nicolas Alvarez" <nic### [at] gmailisthebestcom> wrote in message
news:47a75dfb$1@news.povray.org...
> nemesis escribió:
>> stacked spheres?!
>
> Concentric, I guess.
yep, that's what I meant :)
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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"David Buck" <dav### [at] simberoncom> a écrit dans le message de news:
47a7404c$1@news.povray.org...
> One question that will likely come up in the FLOSS interview on Wednesday
> is how POV-Ray renders clouds. I have an answer from when I used to write
> cloud textures years ago - procedural textures with shades of gray and
> transparency and a gradient sphere.
>
> Is there a better more modern way to create spectacular clouds? Many of
> the clouds I'm seeing seem to go beyond the simple texturing technique I
> used to use.
Here's my (now old) MakeCloud macro based on media and density file formats.
http://www.oyonale.com/modeles.php?lang=en&page=36
There have been other implementations of this idea.
In the FLOSS world, POV-Ray's DF3-based volumetric clouds are certainly the
best combination of realism and speed. The good folks from Blender are
looking at this too for the upcoming Peach movie.
http://peach.blender.org/index.php/we-want-volumetric-clouds-in-blender/
G.
--
**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters
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That doesn't count... Thats a photograph!!!!! ;-)
Rarius
"Warp" <war### [at] tagpovrayorg> wrote in message
news:47a75f41@news.povray.org...
> David Buck <dav### [at] simberoncom> wrote:
>> Is there a better more modern way to create spectacular clouds?
>
> Everyone mentions volumetric clouds, but nobody gives an example,
> so here's one:
>
> http://www.oyonale.com/image.php?lang=en&mode=info&code=432§ion=2003
>
> --
> - Warp
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Rarius napsal(a):
> That doesn't count... Thats a photograph!!!!! ;-)
> snip <
yeah, but a fake one
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"Gilles Tran" <gitran_nospam_@wanadoo.fr> wrote:
> http://peach.blender.org/index.php/we-want-volumetric-clouds-in-blender/
hey, from that page I`ve come to this paper:
http://graphics.stanford.edu/papers/vortex_particle-sig05/
very nice!
But probably more interesting is the way M$ Flight Simulator 2004 did it in real
time:
http://ofb.net/~niniane/clouds/
friggin' good enough to me!
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Well, Hymyly,
you know how it is with these POV macros: some things you can adjust, but
not everything. The sex with the cloud macro will be a bit boring, I can
tell you - you can't do the certain, more exciting techniques, you just can
follow the given parameters...
Sven
"Hymyly" <chr### [at] hotmailcom> schrieb im Newsbeitrag
news:web.47a746bebaeb603d63108fea0@news.povray.org...
> David Buck skribis:
>> Is there a better more modern way to create spectacular clouds? Many of
>> the clouds I'm seeing seem to go beyond the simple texturing technique I
>> used to use.
>
> Project Tierra, an automated landscape generation macro by Jaime Vives
> Piqueres
> has the most beautiful clouds I've ever seen in POV-ray. It contains
> macros for
> both cumulus and cirrus clouds, and the basic technique for creating one
> cloud
> is this (if I read the code correctly).
>
> 1. Creating a union of spheres randomly jittered about a central point.
> 2. Using this union object as a pigment function. (Inside = 1, outside =
> 0)
> 3. Adding some turbulence for fluffiness.
> 4. Using the resulting function as a density function for a scattering
> medium.
>
> See for yourself at:
>
> http://www.ignorancia.org/en/index.php?page=Project_Tierra
>
> Personally, I like this macro so much I want to have sex with it.
>
> Hymyly.
> And there was light.
>
>
>
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"Hymyly" <chr### [at] hotmailcom> wrote:
> See for yourself at:
>
> http://www.ignorancia.org/en/index.php?page=Project_Tierra
>
> Personally, I like this macro so much I want to have sex with it.
>
> Hymyly.
> And there was light.
I'm curious about Project Tierra. Does it only create flattish surfaces, or can
the terrain be wrapped around a sphere?
Mike
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I use your macro quite often indeed!!! I might have forgotten it sometimes,
but I think I have almost always acknowledged you for that part of my scenes
:-)
Thomas
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SharkD escribió:
> I'm curious about Project Tierra. Does it only create flattish surfaces, or can
> the terrain be wrapped around a sphere?
It is an isosurface, so it could be changed to a sphere. In fact, I was
tempted to do so, but finally settled for a plane for simplicity, as all I
wanted was landscapes, not entire worlds.
--
Jaime
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