POV-Ray : Newsgroups : povray.general : Cone density Server Time
5 Nov 2024 20:16:02 EST (-0500)
  Cone density (Message 1 to 8 of 8)  
From: Skip Talbot
Subject: Cone density
Date: 18 Jan 2003 17:37:37
Message: <3e29d731@news.povray.org>
Hey everyone,  I'm trying duplicate the spray coming off the tires grazing
the water in this image:
http://members.aol.com/uiucparty/upload/defiantsmall.jpg

To do this I had planned on using a scattering media, with a cone (conular?)
density and some turbulence.  There doesn't appear to be a cone density file
built into pov-ray so I tried using the function for a cone as the density.
However, the field for this isosurface works towards the center of the
surface, so you still get a hard edge at the boundary of the cone.  Any
suggestions on how I could go about getting such a density or entirely
different ways of reproducing this effect?

Skip


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From: Vadim Sytnikov
Subject: Re: Cone density
Date: 18 Jan 2003 18:29:56
Message: <3e29e374$1@news.povray.org>
"Skip Talbot" <sta### [at] uiucedu> wrote:
> Hey everyone,  I'm trying duplicate the spray coming off the tires grazing
> the water in this image:
> http://members.aol.com/uiucparty/upload/defiantsmall.jpg

Clever plane, my compliments. What did you use to model it? (hope you have
enjoyed the recent "modeller -- not a modeller" discussion in p.o-t.).

BTW, I tried to go to http://hometown.aol.com/uiucparty/ and got an "AOL
sucks" page. Interesting. :-)


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From: Skip Talbot
Subject: Re: Cone density
Date: 18 Jan 2003 18:52:00
Message: <3e29e8a0@news.povray.org>
That's a photograph Vadim.  I'm trying to copy it in POV-Ray with a
different aircraft type though (Long-EZ).

LOL, yes I love AOL.  I use this account for web storage.  If you link every
page on an account to their AOL hometown you get 12MB of space as opposed to
the normal 2.  Since I don't use this account for any web sites (just
storage), I simply made a webpage expressing my love for the service and had
it link all the webpages (just one) so I could get the 12MB.

Skip


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From: Vadim Sytnikov
Subject: Re: Cone density
Date: 18 Jan 2003 19:09:55
Message: <3e29ecd3$1@news.povray.org>
"Skip Talbot" <sta### [at] uiucedu> wrote:
> That's a photograph Vadim.  I'm trying to copy it in POV-Ray with a
> different aircraft type though (Long-EZ).

Ahh, you kind of saved me. What a relief... But what a missed opportunity
for Warp! I thought you would say: "Yeh, that's Rhino and 50 years of
experience...". And at this same moment Warp would pop up and yell "You have
seen that! You all have seen that! POV-Ray is NOT a modeller!" Then I would
be floored, or course...


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From: Gilles Tran
Subject: Re: Cone density
Date: 18 Jan 2003 19:42:43
Message: <3e29f483@news.povray.org>

3e29d731@news.povray.org...
> To do this I had planned on using a scattering media, with a cone
(conular?)
> density and some turbulence.  There doesn't appear to be a cone density
file
> built into pov-ray so I tried using the function for a cone as the
density.

I did that for a dust trail once, using a series of spheres of decreasing
size filled with turbulent media. Perhaps the smokegen include could help.
Don't forget to raise the max_trace_level of course...

G.


--
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- POV-Ray and Poser computer images
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From: Skip Talbot
Subject: Re: Cone density
Date: 18 Jan 2003 20:20:01
Message: <3e29fd41$1@news.povray.org>
hehe, I did use Rhino for the modeling.  I don't have 50 years of experience
but the model took about 6 months of on and off work.  :)  Watch p.b.i for
the final result

Skip


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From: Mike Williams
Subject: Re: Cone density
Date: 18 Jan 2003 20:43:21
Message: <3e2a02b9@news.povray.org>
Use a sphereical denisity and scale it in the direction you need. It is not
a cone but will look very close. If you look at the picture the shape is a
rounded shape. the wheels kick up first the the splash fades behind.


"Skip Talbot" <sta### [at] uiucedu> wrote in message
news:3e29d731@news.povray.org...
> Hey everyone,  I'm trying duplicate the spray coming off the tires grazing
> the water in this image:
> http://members.aol.com/uiucparty/upload/defiantsmall.jpg
>
> To do this I had planned on using a scattering media, with a cone
(conular?)
> density and some turbulence.  There doesn't appear to be a cone density
file
> built into pov-ray so I tried using the function for a cone as the
density.
> However, the field for this isosurface works towards the center of the
> surface, so you still get a hard edge at the boundary of the cone.  Any
> suggestions on how I could go about getting such a density or entirely
> different ways of reproducing this effect?
>
> Skip
>
>
>


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From: ABX
Subject: Re: Cone density
Date: 20 Jan 2003 06:52:11
Message: <gkon2v8kp2qeqise44uv7qv21lud2739t3@4ax.com>
On Sat, 18 Jan 2003 16:37:38 -0600, "Skip Talbot" <sta### [at] uiucedu> wrote:
> I tried using the function for a cone as the density.
> However, the field for this isosurface works towards the center of the
> surface, so you still get a hard edge at the boundary of the cone.

Try my IC_Cone macro/function from IsoCSG library in "rounded" mode.

ABX


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