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On 25/10/2017 17:31, Bald Eagle wrote:
> "cbpypov" <nomail@nomail> wrote:
>> Hi,
>>
>> I'm trying to render a high quality "cover art" for a physics thesis
>> (nanophotonics). I have basically two questions:
>>
>> 1. What is the best way to generate a "glowing field distribution"?
>> 2. What is the best way to illustrate a light ray or "photon path" coming from
>> an emitter, say a small glowing sphere
>
> I would say that you should look at Paul Nylander's work
> http://www.bugman123.com/index.html
> as he's and engineer, and has done an awful lot of very professional quality
> scientific visualization with POV-Ray.
>
>> For 1): Say I have field values in 3D that I could assign to desired colors and
>> brightness values. So that that I have e.g. a list of (x, y, z, R, G, B,
>> brightness).
> .....
>> So how can I achieve something like
>> this?
>
> You use an EMISSIVE media.
> I'd also consider generating your field as a df3 file, and then you can "sculpt"
> the media density with that df3 information.
>
DF3s are probably the way to do it. One drawback is that PovRay uses
df3s as a monochrome input. So you would need three of them to R G & B
images. jr might be able to help you with the df3 format as he is
working on a set of df3 utilities.
The code I use for rendering in colour with df3s is:
#declare PF = 64 ; // multiplication factor
#declare Df3_Material0 =
material{
texture {
pigment {
colour rgbft <1.000,1.000,1.00,0.000,1.000>
}
}
interior{
ior 1.000
caustics 0.000
dispersion 1.000
dispersion_samples 7.000
fade_power 0.000
fade_distance 0.000
fade_color rgb <0.000,0.000,0.000>
media {
method 3
intervals 10
samples 1, 1
confidence 0.900
variance 0.008
ratio 0.900
absorption rgb <0.000,0.000,0.000>
emission rgb <1.000,0.000,0.000> * PF
aa_threshold 0.050
aa_level 4
density {
density_file df3 "Your_red.df3"
interpolate 2
}
}
media {
method 3
intervals 10
samples 1, 1
confidence 0.900
variance 0.008
ratio 0.900
absorption rgb <0.000,0.000,0.000>
emission rgb <0.000,1.000,0.000> * PF
aa_threshold 0.050
aa_level 4
density {
density_file df3 "Your_green.df3"
interpolate 2
}
}
media {
method 3
intervals 10
samples 1, 1
confidence 0.900
variance 0.008
ratio 0.900
absorption rgb <0.000,0.000,0.000>
emission rgb <0.000,0.000,1.000> * PF
aa_threshold 0.050
aa_level 4
density {
density_file df3 "Your_blue.df3"
interpolate 2
}
}
}
translate <-0.500,-0.500,-0.500>
}
>
>> for 2): They should moreover be small particles emitting focussed beams or maybe
>> glowing wiggly rays. Does anyone have an example of how to implement this?
>
You might be able to adapt Rune's Electricity Include File to get what
you need. It does say that it uses MegaPov 1.0. But that is only for the
glow, I think.
http://runevision.com/3d/include/
>
>> Thanks in advance
>
> Certainly: good luck!
>
>
Seconded. :-)
--
Regards
Stephen
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