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Am 22.02.2019 um 20:04 schrieb MichaelJF:
> Hi to the crowd,
>
> this image has still a lot of flaws (sun colour and reflections, the
> swan model itself, textures of the cattails) and may be limitations to
> media by POV. media seems to be handling color_maps or density_maps
> different than pigment or texture having no interpolation between the
> map entries but shap edges. This is what I derived in a first attempt.
> Rendering time was a little bit longer (3 weeks).
>
> Best regards
> Michael
>
Hi to the crowd again,
since I lost all the code of the original approach of this image due to
a headcrash, I had to restart this scene from scratch. Only the
erroneous density I posted here was left and the corrections Thomas and
Alain proposed of course. Here is the actual WIP. I wondered how a white
sun can cast yellow beams, but I took this RL image
https://de.wikipedia.org/wiki/Sonnenaufgang#/media/Datei:Sonnenaufgang_penon_de_ifach.jpg
as a basis for the sky_sphere, the sun, and its reflections. I failed to
model this thin slice of white in the reflections in the original
photography so far. But I think to "forget" it, is a venial sin.
I plan to add some pines, cattails, gras, broom, and the swan of course,
but nothing more. The steam fog over land will be invisible after the
addition of the plants (hope so). Additional suggestions are welcome as
ever.
At the moment the rendering time is manageable: some hour with 16
threads at 3.6 GHz (intel core i9).
Best regards
Michael
Post a reply to this message
Attachments:
Download 'gelaende_pov_scene13.png' (849 KB)
Preview of image 'gelaende_pov_scene13.png'
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MichaelJF <mi-### [at] t-online de> wrote:
> I failed to
> model this thin slice of white in the reflections in the original
> photography so far. But I think to "forget" it, is a venial sin.
Maybe you can add a cylinder of media that is bisected by the water's surface?
Or layer an AOI texture onto the water?
Other than that, I'd look to prior art in the archives, or in other graphics
groups...
Great job so far! :)
Post a reply to this message
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Op 16/08/2020 om 18:27 schreef Bald Eagle:
> MichaelJF <mi-### [at] t-onlinede> wrote:
>> I failed to
>> model this thin slice of white in the reflections in the original
>> photography so far. But I think to "forget" it, is a venial sin.
>
> Maybe you can add a cylinder of media that is bisected by the water's surface?
> Or layer an AOI texture onto the water?
>
> Other than that, I'd look to prior art in the archives, or in other graphics
> groups...
>
> Great job so far! :)
>
>
>
Great job indeed. First thing I thought concerning this issue was: Tom
York's diffuse modulation. Maybe it can help you: see his comment in the
following thread:
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
--
Thomas
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Am 17.08.2020 um 08:45 schrieb Thomas de Groot:
> Op 16/08/2020 om 18:27 schreef Bald Eagle:
>> MichaelJF <mi-### [at] t-onlinede> wrote:
>>> I failed to
>>> model this thin slice of white in the reflections in the original
>>> photography so far. But I think to "forget" it, is a venial sin.
>>
>> Maybe you can add a cylinder of media that is bisected by the water's
>> surface?
>> Or layer an AOI texture onto the water?
>>
>> Other than that, I'd look to prior art in the archives, or in other
>> graphics
>> groups...
>>
>>
>>
>>
>
> Great job indeed. First thing I thought concerning this issue was: Tom
> York's diffuse modulation. Maybe it can help you: see his comment in the
> following thread:
>
>
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
>
>
Thank you both for your suggestions. May be the addition of an other
media may cure the problem but I had a lot of difficulties to adjust the
media as they are so far and will not risk to disturb them by another
one. The other approach proposed by Thomas is the use of a texture_map
to the lake similiar to the construction of my sky_sphere. Fortunatelly
air has no ripples or waves and is more predictable as water. May be I
must have more patience in modellng a filtering disc with a proper
scaled hole
disc {
0,z,20000, unkown hole size
pigment { colour srgbf <1,0.847,0.333,1> }
rotate <0,0,-90-degrees(acos(vnormalize(SolarPosition).z))>
translate SolarPosition/10000
no_image no_reflection
}
Best regards
Michael
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Op 17/08/2020 om 19:11 schreef MichaelJF:
> Am 17.08.2020 um 08:45 schrieb Thomas de Groot:
>> Op 16/08/2020 om 18:27 schreef Bald Eagle:
>>> MichaelJF <mi-### [at] t-onlinede> wrote:
>>>> I failed to
>>>> model this thin slice of white in the reflections in the original
>>>> photography so far. But I think to "forget" it, is a venial sin.
>>>
>>> Maybe you can add a cylinder of media that is bisected by the water's
>>> surface?
>>> Or layer an AOI texture onto the water?
>>>
>>> Other than that, I'd look to prior art in the archives, or in other
>>> graphics
>>> groups...
>>>
>>>
>>>
>>>
>>
>> Great job indeed. First thing I thought concerning this issue was: Tom
>> York's diffuse modulation. Maybe it can help you: see his comment in
>> the following thread:
>>
>>
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
>>
>>
> Thank you both for your suggestions. May be the addition of an other
> media may cure the problem but I had a lot of difficulties to adjust the
> media as they are so far and will not risk to disturb them by another
> one. The other approach proposed by Thomas is the use of a texture_map
> to the lake similiar to the construction of my sky_sphere. Fortunatelly
> air has no ripples or waves and is more predictable as water. May be I
> must have more patience in modellng a filtering disc with a proper
> scaled hole
>
> disc {
> }
>
> Best regards
> Michael
>
Best approach I guess is the one made by Jaime Vives Piqueres. I have
been working with his code lately for a couple of months (adding foam to
sea water for instance; see my 'Nature Beyond' thread).
See the following link for the technical aspects:
http://www.ignorancia.org/index.php/galleries/old-images/sea-buoy/
--
Thomas
Post a reply to this message
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> Thank you both for your suggestions. May be the addition of an other
> media may cure the problem but I had a lot of difficulties to adjust the
> media as they are so far and will not risk to disturb them by another
> one. The other approach proposed by Thomas is the use of a texture_map
> to the lake similiar to the construction of my sky_sphere. Fortunatelly
> air has no ripples or waves and is more predictable as water. May be I
> must have more patience in modellng a filtering disc with a proper
> scaled hole
>
> disc {
> }
>
> Best regards
> Michael
>
When working with disc, don't forget that they have an interior that is
not limited to the visible part.
Whenever you have media, you need to add hollow to any disc in the scene.
This :
disc{0 y 10}
have the same interior as this :
plane{y 0}
Post a reply to this message
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Am 18.08.2020 um 19:46 schrieb Alain Martel:
>
>> Thank you both for your suggestions. May be the addition of an other
>> media may cure the problem but I had a lot of difficulties to adjust
>> the media as they are so far and will not risk to disturb them by
>> another one. The other approach proposed by Thomas is the use of a
>> texture_map to the lake similiar to the construction of my sky_sphere.
>> Fortunatelly air has no ripples or waves and is more predictable as
>> water. May be I must have more patience in modellng a filtering disc
>> with a proper scaled hole
>>
>> disc {
>> }
>>
>> Best regards
>> Michael
>>
>
> When working with disc, don't forget that they have an interior that is
> not limited to the visible part.
> Whenever you have media, you need to add hollow to any disc in the scene.
>
> This :
> disc{0 y 10}
> have the same interior as this :
> plane{y 0}
Many thanks,
yes I tested the approach with the disk without the media. I added the
media later.
Best regards
Michael
Post a reply to this message
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Am 18.08.2020 um 09:15 schrieb Thomas de Groot:
> Op 17/08/2020 om 19:11 schreef MichaelJF:
>> Am 17.08.2020 um 08:45 schrieb Thomas de Groot:
>>> Op 16/08/2020 om 18:27 schreef Bald Eagle:
>>>> MichaelJF <mi-### [at] t-onlinede> wrote:
>>>>> I failed to
>>>>> model this thin slice of white in the reflections in the original
>>>>> photography so far. But I think to "forget" it, is a venial sin.
>>>>
>>>> Maybe you can add a cylinder of media that is bisected by the
>>>> water's surface?
>>>> Or layer an AOI texture onto the water?
>>>>
>>>> Other than that, I'd look to prior art in the archives, or in other
>>>> graphics
>>>> groups...
>>>>
>>>>
>>>>
>>>>
>>>
>>> Great job indeed. First thing I thought concerning this issue was:
>>> Tom York's diffuse modulation. Maybe it can help you: see his comment
>>> in the following thread:
>>>
>>>
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
>>>
>>>
>> Thank you both for your suggestions. May be the addition of an other
>> media may cure the problem but I had a lot of difficulties to adjust
>> the media as they are so far and will not risk to disturb them by
>> another one. The other approach proposed by Thomas is the use of a
>> texture_map to the lake similiar to the construction of my sky_sphere.
>> Fortunatelly air has no ripples or waves and is more predictable as
>> water. May be I must have more patience in modellng a filtering disc
>> with a proper scaled hole
>>
>> disc {
>> }
>>
>> Best regards
>> Michael
>>
>
> Best approach I guess is the one made by Jaime Vives Piqueres. I have
> been working with his code lately for a couple of months (adding foam to
> sea water for instance; see my 'Nature Beyond' thread).
>
> See the following link for the technical aspects:
>
> http://www.ignorancia.org/index.php/galleries/old-images/sea-buoy/
>
Hello Thomas,
you did a very good job in adding foam to Jaime's sea and added a very
nice whale. First I tried an isosurface similiar to Jaime's approach but
I decided against it since it looked to much like sea with storms and
tides and so on and not like a quiet lake.
Best regards
Michael
Post a reply to this message
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Op 18/08/2020 om 20:17 schreef MichaelJF:
> Am 18.08.2020 um 09:15 schrieb Thomas de Groot:
>> Op 17/08/2020 om 19:11 schreef MichaelJF:
>>> Am 17.08.2020 um 08:45 schrieb Thomas de Groot:
>>>> Op 16/08/2020 om 18:27 schreef Bald Eagle:
>>>>> MichaelJF <mi-### [at] t-onlinede> wrote:
>>>>>> I failed to
>>>>>> model this thin slice of white in the reflections in the original
>>>>>> photography so far. But I think to "forget" it, is a venial sin.
>>>>>
>>>>> Maybe you can add a cylinder of media that is bisected by the
>>>>> water's surface?
>>>>> Or layer an AOI texture onto the water?
>>>>>
>>>>> Other than that, I'd look to prior art in the archives, or in other
>>>>> graphics
>>>>> groups...
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> Great job indeed. First thing I thought concerning this issue was:
>>>> Tom York's diffuse modulation. Maybe it can help you: see his
>>>> comment in the following thread:
>>>>
>>>>
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
>>>>
>>>>
>>> Thank you both for your suggestions. May be the addition of an other
>>> media may cure the problem but I had a lot of difficulties to adjust
>>> the media as they are so far and will not risk to disturb them by
>>> another one. The other approach proposed by Thomas is the use of a
>>> texture_map to the lake similiar to the construction of my
>>> sky_sphere. Fortunatelly air has no ripples or waves and is more
>>> predictable as water. May be I must have more patience in modellng a
>>> filtering disc with a proper scaled hole
>>>
>>> disc {
>>> }
>>>
>>> Best regards
>>> Michael
>>>
>>
>> Best approach I guess is the one made by Jaime Vives Piqueres. I have
>> been working with his code lately for a couple of months (adding foam
>> to sea water for instance; see my 'Nature Beyond' thread).
>>
>> See the following link for the technical aspects:
>>
>> http://www.ignorancia.org/index.php/galleries/old-images/sea-buoy/
>>
> Hello Thomas,
>
> you did a very good job in adding foam to Jaime's sea and added a very
> nice whale. First I tried an isosurface similiar to Jaime's approach but
> I decided against it since it looked to much like sea with storms and
> tides and so on and not like a quiet lake.
>
I am beginning to wonder if I understand your problem correctly. It is
the reflection of the Sun's disk on the water surface, isn't it? If so,
this is solved very nicely imo by the finish block of the water and the
finish block only. Jaime uses the following code for his (sea) water
surface:
finish { // borrowed from Christoph Hormann
diffuse 0.5
reflection {
0.0, 1.0
fresnel on
falloff 1
}
conserve_energy
specular 0.8
roughness 0.0035
}
The use of this results in the image attached. My earlier suggestion
about Tom York's diffuse modulation works well on opaque surfaces. I
realise now that it would be difficult to implement correctly on a water
surface.
I am sorry if I confused you with information not entirely up to the point.
--
Thomas
Post a reply to this message
Attachments:
Download 'jvp_sea_kw4.png' (517 KB)
Preview of image 'jvp_sea_kw4.png'
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Am 19.08.2020 um 08:38 schrieb Thomas de Groot:
> Op 18/08/2020 om 20:17 schreef MichaelJF:
>> Am 18.08.2020 um 09:15 schrieb Thomas de Groot:
>>> Op 17/08/2020 om 19:11 schreef MichaelJF:
>>>> Am 17.08.2020 um 08:45 schrieb Thomas de Groot:
>>>>> Op 16/08/2020 om 18:27 schreef Bald Eagle:
>>>>>> MichaelJF <mi-### [at] t-onlinede> wrote:
>>>>>>> I failed to
>>>>>>> model this thin slice of white in the reflections in the original
>>>>>>> photography so far. But I think to "forget" it, is a venial sin.
>>>>>>
>>>>>> Maybe you can add a cylinder of media that is bisected by the
>>>>>> water's surface?
>>>>>> Or layer an AOI texture onto the water?
>>>>>>
>>>>>> Other than that, I'd look to prior art in the archives, or in
>>>>>> other graphics
>>>>>> groups...
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> Great job indeed. First thing I thought concerning this issue was:
>>>>> Tom York's diffuse modulation. Maybe it can help you: see his
>>>>> comment in the following thread:
>>>>>
>>>>>
http://news.povray.org/povray.newusers/thread/%3Cweb.4393311ed86e519e4114da700@news.povray.org%3E/?ttop=338362&toff=650
>>>>>
>>>>>
>>>> Thank you both for your suggestions. May be the addition of an other
>>>> media may cure the problem but I had a lot of difficulties to adjust
>>>> the media as they are so far and will not risk to disturb them by
>>>> another one. The other approach proposed by Thomas is the use of a
>>>> texture_map to the lake similiar to the construction of my
>>>> sky_sphere. Fortunatelly air has no ripples or waves and is more
>>>> predictable as water. May be I must have more patience in modellng a
>>>> filtering disc with a proper scaled hole
>>>>
>>>> disc {
>>>> }
>>>>
>>>> Best regards
>>>> Michael
>>>>
>>>
>>> Best approach I guess is the one made by Jaime Vives Piqueres. I have
>>> been working with his code lately for a couple of months (adding foam
>>> to sea water for instance; see my 'Nature Beyond' thread).
>>>
>>> See the following link for the technical aspects:
>>>
>>> http://www.ignorancia.org/index.php/galleries/old-images/sea-buoy/
>>>
>> Hello Thomas,
>>
>> you did a very good job in adding foam to Jaime's sea and added a very
>> nice whale. First I tried an isosurface similiar to Jaime's approach
>> but I decided against it since it looked to much like sea with storms
>> and tides and so on and not like a quiet lake.
>>
>
> I am beginning to wonder if I understand your problem correctly. It is
> the reflection of the Sun's disk on the water surface, isn't it? If so,
> this is solved very nicely imo by the finish block of the water and the
> finish block only. Jaime uses the following code for his (sea) water
> surface:
>
>
> The use of this results in the image attached. My earlier suggestion
> about Tom York's diffuse modulation works well on opaque surfaces. I
> realise now that it would be difficult to implement correctly on a water
> surface.
>
> I am sorry if I confused you with information not entirely up to the point.
>
Hi Thomas,
if you look at the photography from the wikipedia you will notice a very
small area of white reflections from the sun from the horizon to the
middle of the reflections at the sea. But I overlooked that in my image
I have a very different angle (sun and camera are at a very lower level)
between sun and camera. If I lift the camera in this scene from y=1 to
y=10 POV displayed the white reflections at the sea. In my setting they
coinside to happen at the land area. Sorry that I led you on a wrong
track. But many thanks anyway.
Best regards
Michael
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