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From: Bill Pragnell
Subject: The POV-cannon
Date: 13 Jan 2006 04:50:00
Message: <web.43c7769cf370361a731f01d10@news.povray.org>
As an aside to playing with knots, I've also been experimenting with objects
constructed from bricks - specifically, perturbing the bricks based on
their location.

The two examples here are based on the bricks' distance from a line. The
closer a brick is to the line, the more pronounced its displacement in the
direction of the line (more precisely, within a cone aligned with the
line). The displacement drops off with distance d from the line as exp(-d).

The cannonball just puts the whole exercise into context. Fun, isn't it? I
could spend a whole evening carefully building brick structures in POV and
then blowing holes in them! Plenty of scope for variations, too - could
make things explode from a point, fall apart across a plane, be sucked into
a black hole...

Bill


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From: Bill Pragnell
Subject: Re: The POV-cannon
Date: 13 Jan 2006 05:00:01
Message: <web.43c779d6de0fbdb8731f01d10@news.povray.org>
and t'other


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From: Marc Jacquier
Subject: Re: The POV-cannon
Date: 13 Jan 2006 09:31:58
Message: <43c7b9de$1@news.povray.org>

news:web.43c7769cf370361a731f01d10@news.povray.org...
> As an aside to playing with knots, I've also been experimenting with
objects
> constructed from bricks - specifically, perturbing the bricks based on
> their location.
>
I can't say anything else than that's great!

Marc


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From: Roman Reiner
Subject: Re: The POV-cannon
Date: 13 Jan 2006 09:40:01
Message: <web.43c7bb85de0fbdb8164ff1260@news.povray.org>
Hehe.
That's cool!

What a pity that this code is not based on real physics so we can't see
those towers falling together.

On the other hand: quite impressive results depending on the simplicity of
the code!

Can't wait to see other perforated buildings ;-)

Regards Roman


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From: Bill Pragnell
Subject: Re: The POV-cannon
Date: 13 Jan 2006 10:00:01
Message: <web.43c7bfd4de0fbdb8731f01d10@news.povray.org>
"Roman Reiner" <lim### [at] gmxde> wrote:
> What a pity that this code is not based on real physics so we can't see
> those towers falling together.
It could be - instead of a displacement, I could use the code to generate a
velocity. Unfortunately, I'd also need to write some collision detection,
and keep track of each brick throughout the parse... eek!

> On the other hand: quite impressive results depending on the simplicity of
> the code!
Oh yes. I calulate the displacement for each brick at instantiation, so I
don't need any arrays or anything. The whole thing is only 2 or 3 lines
more than the code needed to generate the chimney itself!

> Can't wait to see other perforated buildings ;-)
I'll knock up (or should that be down?) some more over the weekend. :)

Bill


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From: Smws
Subject: Re: The POV-cannon
Date: 13 Jan 2006 11:50:00
Message: <web.43c7d9b0de0fbdb87dceea40@news.povray.org>
Wow, that looks really interesting. I fear for your future figures on a
staircase-knot, though- now, in addition to being trapped in a paradox, are
they to be bombarded as well? :)


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From: Jim Charter
Subject: Re: The POV-cannon
Date: 13 Jan 2006 11:58:39
Message: <43c7dc3f$1@news.povray.org>
Bill Pragnell wrote:
This does look good.  Interesting indeed.


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From: Bill Pragnell
Subject: Re: The POV-cannon
Date: 13 Jan 2006 12:00:00
Message: <web.43c7dbedde0fbdb8731f01d10@news.povray.org>
"Smws" <smw### [at] poboxcom> wrote:
> Wow, that looks really interesting. I fear for your future figures on a
> staircase-knot, though- now, in addition to being trapped in a paradox, are
> they to be bombarded as well? :)

I'd be lying if I said I wasn't tooling up for some knot deconstruction.
(rubs hands with glee)

;)
Bill


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From: Tim Cook
Subject: Re: The POV-cannon
Date: 13 Jan 2006 12:12:18
Message: <43c7df72@news.povray.org>
Hahaha, that's sweet.

I can think of a few interesting applications for that...  (try spheres, 
which are smaller, and originally arranged to fill a mesh which 
resembles...a person?  or whatever you want to shoot up or impale violently)

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------


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From: Mike Williams
Subject: Re: The POV-cannon
Date: 13 Jan 2006 12:48:21
Message: <aJS19VAze+xDFwdZ@econym.demon.co.uk>
Wasn't it Tim Cook who wrote:
>Hahaha, that's sweet.
>
>I can think of a few interesting applications for that...  (try spheres, 
>which are smaller, and originally arranged to fill a mesh which 
>resembles...a person?  or whatever you want to shoot up or impale violently)

It would be easier, and might produce a better result, to take a mesh
object and apply the method to the individual triangles or
smooth_triangles. I'd use a mesh, rather than a mesh2 so that the
triangles come apart when displaced, rather than being joined at the
vertices.

-- 
Mike Williams
Gentleman of Leisure


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