"Tom Melly" <pov### [at] tomandlucouk> schreef in bericht
news:422ddf78@news.povray.org...
> I think mainly that I'm making an assumption about the scale of both the
> background (mainly the mesa on the left), and the ground-objects.
>
> Also, something about the smoke gives an impression of the scale.
>
> I find it hard to pin it down exactly, but basically my brain keeps
telling
> me that it's about 80ft high...

after some more research, I think I know what's the problem: as someone
already mentioned, the smoke, dust and fire isn't dense enough to make it
look big.  Also the dust-shockwave needs more detail, more structure, and it
should be bigger.

cu!
-- 
ZK AKA Gaeriel
http://www.povplace.be.tf
"I plan to live forever! ... or die trying..."

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> hmm, what is it that makes it looks small?  The background?

Excessive detail in the background makes it look like a model.
Note that the cloud does not look that way, but the background does.

Try putting the background away at a proper distance, scaling it up 
appropriately, then a little focal blur.

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Excellent! The improvement from the last version is radical.

Congrats,

Fernando.

Zeger Knaepen wrote:
> slightly better shape, and a better background :)
> but it took 10 minutes to trace this time
> 
> cu!
>

Post a reply to this message

"Fernando G. del Cueto" <fcu### [at] yahoocom> wrote in message
news:422e15a3$1@news.povray.org...
> Excellent! The improvement from the last version is radical.
>
> Congrats,

Thank you! :)

cu!
--
camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

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The right honourable Zeger Knaepen spake:

> "Stefan Viljoen" <ryl### [at] polardcom> schreef in bericht
> news:422d380b@news.povray.org...
>> The right honourable Zeger Knaepen spake:
>>
>> > slightly better shape, and a better background :)
>> > but it took 10 minutes to trace this time
>> >
>> > cu!
>>
>> Wow... how DID you do that?!
> 
> :)
> 9500 spheres arranged in a mushroom-shape (with a lot of while-loops of
> course :)) and seperated into a couple of categories: smoke, dust and 3

Interesting. The only problem is that if -I- tried it it would still look
like 9500 spheres.... not a very realistic nuclear detonation.

:0

But that's just me!

Keep it up - how about trying a fuel-air explosion next?

Kind regards,
-- 
---
Stefan Viljoen
Software Support Technician / Programmer
Polar Design Solutions

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Hi,
A lot of the appearance depends on how long it is from detonation.
http://www.cddc.vt.edu/host/atomic/nukeffct/enw77b1.htm
States:

2.05 The surface temperatures of the fireball, upon which the brightness (or 
luminance) depends, do not vary greatly with the total energy yield of the 
weapon. Consequently, the observed brightness of the fireball in an air 
burst is roughly the same, regardless of the amount of energy released in 
the explosion. Immediately after its formation the fireball begins to grow 
in size, engulfing the surrounding air. This growth is accompanied by a 
decrease in temperature because of the accompanying increase in mass. At the 
same time, the fireball rises, like a hot-air balloon. Within seven-tenths 
of a millisecond from the detonation, the fireball from a 1-megaton weapon 
is about 440 feet across, and this increases to a maximum value of about 
5,700 feet in 10 seconds. It is then rising at a rate of 250 to 350 feet per 
second. After a minute, the fireball has cooled to such an extent that it no 
longer emits visible radiation. It has then risen roughly 4.5 miles from the 
point of burst.



and continues to describe color effects etc ...

DLM



"Zeger Knaepen" <zeg### [at] studentkuleuvenacbe> wrote in message 
news:422d0f41@news.povray.org...
> slightly better shape, and a better background :)
> but it took 10 minutes to trace this time
>
> cu!
> -- 
> ZK AKA Gaeriel
> http://www.povplace.be.tf
> "Luckyly they included a button, right here, that'll blow the entire thing
> up!"
>
>
>

Post a reply to this message

"dlm" <me### [at] addressinvalid> wrote in message news:4238a729$1@news.povray.org...
> Hi,
> A lot of the appearance depends on how long it is from detonation.
> http://www.cddc.vt.edu/host/atomic/nukeffct/enw77b1.htm
> States:
>
> 2.05 The surface temperatures of the fireball, upon which the brightness (or
> luminance) depends, do not vary greatly with the total energy yield of the
> weapon. Consequently, the observed brightness of the fireball in an air
> burst is roughly the same, regardless of the amount of energy released in
> the explosion. Immediately after its formation the fireball begins to grow
> in size, engulfing the surrounding air. This growth is accompanied by a
> decrease in temperature because of the accompanying increase in mass. At the
> same time, the fireball rises, like a hot-air balloon. Within seven-tenths
> of a millisecond from the detonation, the fireball from a 1-megaton weapon
> is about 440 feet across, and this increases to a maximum value of about
> 5,700 feet in 10 seconds. It is then rising at a rate of 250 to 350 feet per
> second. After a minute, the fireball has cooled to such an extent that it no
> longer emits visible radiation. It has then risen roughly 4.5 miles from the
> point of burst.
>
>
>
> and continues to describe color effects etc ...

hey, that's interesting! thanks!!

cu!
--
camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

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I just have to say it looks VERY cool, quit posting photos :)

(that's a scary thought huh?)

Of course, with the new IRTC animation topic, you just HAVE to post source 
:)  (I'm begging! lol)

        == John ==

"Zeger Knaepen" <zeg### [at] studentkuleuvenacbe> wrote in message 
news:422d0f41@news.povray.org...
> slightly better shape, and a better background :)
> but it took 10 minutes to trace this time
>
> cu!
> -- 
> ZK AKA Gaeriel
> http://www.povplace.be.tf
> "Luckyly they included a button, right here, that'll blow the entire thing
> up!"
>
>
>

Post a reply to this message

"John D. Gwinner" <joh### [at] cornelledu> wrote in message
news:42683c80$1@news.povray.org...
> I just have to say it looks VERY cool, quit posting photos :)
>
> (that's a scary thought huh?)

:)
I wouldn't want to take a photo of such a thing :)

> Of course, with the new IRTC animation topic, you just HAVE to post source
> :)  (I'm begging! lol)

It's not animatable. But someday, the source will be made public! :p

cu!
--
camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

Post a reply to this message

"Zeger Knaepen" <zeg### [at] studentkuleuvenacbe> wrote:
> slightly better shape, and a better background :)
> but it took 10 minutes to trace this time
>
> cu!
> --
> ZK AKA Gaeriel
> http://www.povplace.be.tf
> "Luckyly they included a button, right here, that'll blow the entire thing
> up!"

Zeger, you are an explosion god!  That is the best nuclear explosion I have
ever seen from POV-Ray!  <drooling>
Must...See...Source...File...</drooling>

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