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I spent a good couple of days on and off working out painstakingly
through trigonometry and pythagorean theory the coordinates of all four
spheres in a tetrahedral pyramid of spheres.
Then I had a brainwave and did it a second way in about 45 seconds :(
Anyway, using my inspiration, I built a pyramid around the origin, placed
a point light at the origin, encased the whole lot in a sphere filled
with scattering media and wondered what it would look like when spun...
Bye for now,
Jamie.
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Attachments:
Download 'pyramid.mpg' (282 KB)
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From: Rune
Subject: Re: Nope, sorry, no glows here... (282Kbu) - pyramid.mpg [1/1]
Date: 7 Sep 2000 17:47:31
Message: <39b80cf3@news.povray.org>
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Wow, very nice!
And I can indeed see a glow!
Greetings,
Rune
--
\ Include files, tutorials, 3D images, raytracing jokes,
/ The POV Desktop Theme, and The POV-Ray Logo Contest can
\ all be found at http://rsj.mobilixnet.dk (updated July 23)
/ Also visit http://www.povrayusers.org
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On Thu, 7 Sep 2000 23:47:27 +0200, Rune wrote...
> Wow, very nice!
I don't know about very, but I thought it was fairly intriguing.
Oh, and the reason it's so small is that I cranked up the media settings
to smooth out the media, and wanted it to render some time this month
<grin>
> And I can indeed see a glow!
I meant no MP+ glows :P
Just in case anyone is remotely interested, the quick way I figured out
for building a regular tetrahedral pyramid of spheres was just to place a
sphere at half of the vertices of a cube, evenly spaced
I.e. <-1,-1,-1> <1,-1,1> <-1,1,1> <1,1,-1> For a 2 unit cube centred
on the origin, then you just scale up the spheres until the two a y=-1
just touch. In this case, scale them to ((sqrt(8))/2)
Did that make any sense?
Bye for now,
Jamie.
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From: Bob Hughes
Subject: Re: Nope, sorry, no glows here... (282Kbu) - pyramid.mpg [1/1]
Date: 13 Sep 2000 05:09:41
Message: <39bf4455@news.povray.org>
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Interesting, a kind of CSG using light and media and spheres then.
I know if I were to try placing the speres like that I wouldn't have even
thought of mathematics, except for the little bit needed to make the four
vectors. Like so: 1 unit radius spheres, position each half a unit
up/down/sideways and hope for the best; adjust if wrong.
Got any more light shapes planned or is this going to be the one and only?
Bob
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On Wed, 13 Sep 2000 04:02:35 -0500, Bob Hughes wrote...
> Interesting, a kind of CSG using light and media and spheres then.
> I know if I were to try placing the speres like that I wouldn't have even
> thought of mathematics, except for the little bit needed to make the four
> vectors. Like so: 1 unit radius spheres, position each half a unit
> up/down/sideways and hope for the best; adjust if wrong.
> Got any more light shapes planned or is this going to be the one and only?
I don't know. This came out because I decided to try to rebuild a four
ball stack in Moray I had built it once before, but lost the file and
forgot the maths :) Then, since I'd built it around the origin, I
decided to put a light source in and see what happened. Then to see what
was happening with the light, I needed to add media. So, to keep render
time down, I restricted the media to a sphere with a spherical density,
set the animation rendering with quite possibly ludicrous settings to
smooth out the media, and that's what came out.
On the other hand... while typing this I've had another couple of ideas
that I may get round to trying when I have the time. mind you, unless
the fuel situation eases, I may have some spare time...
Oh, and positioning a unit sphere up, down and sideways would give you 6
spheres, since there are two sideways axes :)
Bye for now,
Jamie.
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