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Le 01/12/2014 00:47, Stephen a écrit :
> On 30/11/2014 22:22, FractRacer wrote:
>> Hello,
>> I have a problem with interior's media with official Pov, in the image
>> we can see a all white media when rendered with Pov 3.7, and the good
>> colors with Uberpov.
>> Can someone explain this?
>>
>
> Your code would help. ;-)
>
Here is the problem !
#version 3.7;
global_settings{
assumed_gamma 1
max_trace_level 25
ambient_light 1
}
background { rgb <0.000000, 0.000000, 0.000000> }
#declare camera_location = <0, 0, -75>;
camera{
location camera_location
up y
right x*image_width/image_height
angle 45
look_at 0
}
#declare SZ = 1500;
#declare SR = 200;
#declare Sun = sphere{
<0,0,0>, 1.2
pigment { rgbt 1 filter 0.0 }
finish {
specular albedo 0.2
}
hollow
interior{
ior 1.8
media{
method 3
emission 2.26
scattering{
1,
<.1,.5,1>*3.00
extinction 1.50
}
density{
granite
turbulence 0.85
color_map {
[0.00 rgbf 0]
[0.05 rgbf 0]
[0.20 rgbf 0.2]
[0.30 rgbf 0.6]
[0.40 rgbf 0.8]
[0.50 rgbf 0.991]
[0.60 rgbf 0.8]
[0.70 rgbf 0.6]
[0.80 rgbf 0.2]
[0.95 rgbf 0]
[1.00 rgbf 0]
}
}
samples 1,1
intervals 3
confidence 0.9
}
}
}
object {
Sun
scale <200,200,10>
translate <0,0,SZ+50>
}
--
Lionel
Do not judge my words, judge my actions.
---
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protection avast! Antivirus est active.
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Le 01/12/2014 09:13, Thomas de Groot a écrit :
> [start mumbling in background]
> What happened to Mickey's ear?
> [stop mumbling in background]
>
> Thomas
>
>
One ear is enough for Mickey. :)
--
Lionel
<b>Do not judge my words, judge my actions.</b>
---
Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la
protection avast! Antivirus est active.
http://www.avast.com
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I think the problem is with your use of intervals and samples. Using
method 3, intervals should always be 1 while only the first parameter of
samples is read by the program. The second one is ignored.
Replace:
samples 1,1
intervals 3
by:
samples 100
intervals 1
You may need to play with the emission value and the multiplicator for
the scattering value.
Thomas
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And there is more: the scaling of the Sun & scattering media. Those
should be coupled. For that do this:
#declare MyScale = <200, 200, 10>;
On the scattering media line do this (example):
scattering {
1, <.1,.5,1>*5000/MyScale
extinction 1.50
}
And in the object block for the Sun, set: scale MyScale.
In that way you can scale the Sun however you want without changing the
visual aspect of the media. One word of caution: I always am weary of
asymmetrical media scaling. So, I personally prefer to use <200,200,200>
instead of <200,200,10> when I can avoid it.
With all this I have not yet got the Uberpov aspect in official POV, but
I am working on it :-)
Thomas
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Third Important Lesson ;-)
ALWAYS work on a *unit-sized* media sphere!
sphere {<0,0,0>, 1.0
instead of
sphere {<0,0,0>,1.2
because that plays havoc when scaling the object.
(You can also delete the filter statement in pigment by the way)
Thomas
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This is what I have got (see image).
Left render with Uberpov; Right render with Pov 3.7.
The only code difference is the emission value: In Uberpov it is 2; in
POV-Ray it is 0.2. Higher values will white out the render. The
difference remains and I think Clipka knows why :-)
This is the media code I used for both renders:
#declare SR = 200;
#declare Sun =
sphere {
<0,0,0>, 1
pigment { rgbt 1}
hollow
interior {
//ior 1.8
media {
method 3
samples 100
intervals 1
//confidence 0.9
emission 0.2 //change to 2 in Uberpov
scattering {
1, <0.1, 0.5, 1>*1000/SR
//extinction 1.50
}
density {
granite
turbulence 0.85
color_map {
[0.00 rgb 0]
[0.05 rgb 0]
[0.20 rgb 0.2]
[0.30 rgb 0.6]
[0.40 rgb 0.8]
[0.50 rgb 0.991]
[0.60 rgb 0.8]
[0.70 rgb 0.6]
[0.80 rgb 0.2]
[0.95 rgb 0]
[1.00 rgb 0]
}
}
}
}
}
object {
Sun
scale SR
translate <0,0,0>
}
Thomas
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Attachments:
Download 'lionelmediaproblem.jpg' (212 KB)
Preview of image 'lionelmediaproblem.jpg'
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Le 02/12/2014 13:40, Thomas de Groot a écrit :
> This is what I have got (see image).
>
> Left render with Uberpov; Right render with Pov 3.7.
>
> The only code difference is the emission value: In Uberpov it is 2; in
> POV-Ray it is 0.2. Higher values will white out the render. The
> difference remains and I think Clipka knows why :-)
>
> This is the media code I used for both renders:
>
> #declare SR = 200;
>
> #declare Sun =
> sphere {
> <0,0,0>, 1
> pigment { rgbt 1}
> hollow
> interior {
> //ior 1.8
> media {
> method 3
> samples 100
> intervals 1
> //confidence 0.9
> emission 0.2 //change to 2 in Uberpov
> scattering {
> 1, <0.1, 0.5, 1>*1000/SR
> //extinction 1.50
> }
> density {
> granite
> turbulence 0.85
> color_map {
> [0.00 rgb 0]
> [0.05 rgb 0]
> [0.20 rgb 0.2]
> [0.30 rgb 0.6]
> [0.40 rgb 0.8]
> [0.50 rgb 0.991]
> [0.60 rgb 0.8]
> [0.70 rgb 0.6]
> [0.80 rgb 0.2]
> [0.95 rgb 0]
> [1.00 rgb 0]
> }
> }
> }
> }
> }
>
> object {
> Sun
> scale SR
> translate <0,0,0>
> }
>
>
>
> Thomas
>
A big thanks for you, Thomas, I think I have all tried except the
emission's value. And now I know how handle the render with Povray and
Uberpov.
--
Lionel
Do not judge my words, judge my actions.
---
Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la
protection avast! Antivirus est active.
http://www.avast.com
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Am 02.12.2014 13:40, schrieb Thomas de Groot:
> This is what I have got (see image).
>
> Left render with Uberpov; Right render with Pov 3.7.
>
> The only code difference is the emission value: In Uberpov it is 2; in
> POV-Ray it is 0.2. Higher values will white out the render. The
> difference remains and I think Clipka knows why :-)
At the moment I just have a hunch: There were some bogosities in
POV-Ray's media computations which would cause the results to be
systematically off (as opposed to just being imprecise) when using a
very low minimum number of samples. I fixed these, so that low minimum
number of samples would yield results closer to high minimum number of
samples.
The fix quite certainly has made it into UberPov, but may not have been
released for official POV-Ray yet due to longer release cycles there.
I can't currently verify that this is the reason for the differences you
see in this case, for the lack of round tuits; I hope to get one or two
of those in the second half of December.
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On 2-12-2014 14:26, FractRacer wrote:
> A big thanks for you, Thomas, I think I have all tried except the
> emission's value. And now I know how handle the render with Povray and
> Uberpov.
>
It's my pleasure. I seem to vaguely remember that Clipka explained the
differences, but my memory is not what it has been anymore...
Thomas
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On 2-12-2014 15:49, clipka wrote:
> I can't currently verify that this is the reason for the differences you
> see in this case, for the lack of round tuits; I hope to get one or two
> of those in the second half of December.
>
There is a tuit shower due over Germany around that time I heard. Thanks
for your good work sir!
Thomas
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