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A slightly more involved test, using chains for demolition instead of balls.
The tower is double shelled (to support the overhangs), so offers more
resistance. I built the tower in POV-Ray first, then converted the macros into
lua. The chain link was also POV-Ray - I wrote a macro to build arbitrary chain
links and save the triangles to an .obj file, which I then converted into .3ds
for use in the bullet playground using meshlab. During rendering, the meshes are
substituted for CSG.
Bill
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Attachments:
Download 'chain_tower_qa.mp4.mpg' (3610 KB)
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On 20/06/2013 8:55 AM, Bill Pragnell wrote:
> A slightly more involved test, using chains for demolition instead of balls.
Fun! fun, fun. :-D
And no actual towers were hurt in the making of this video. ;-)
--
Regards
Stephen
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> A slightly more involved test, using chains for demolition instead of balls.
>
> The tower is double shelled (to support the overhangs), so offers more
> resistance. I built the tower in POV-Ray first, then converted the macros into
> lua. The chain link was also POV-Ray - I wrote a macro to build arbitrary chain
> links and save the triangles to an .obj file, which I then converted into .3ds
> for use in the bullet playground using meshlab. During rendering, the meshes are
> substituted for CSG.
>
Amazing... and very nicely rendered, BTW.
--
Jaime
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Amazing.
I have just re-read /Skylark of Valeron/ by E.E. Smith (1963 edition of
the 1934 space opera) where the hero, being stranded in 4th dimension
hyper-space, swings similar chains, tearing through complete buildings
and its inhabitants. :-)
Thomas
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On 06/20/2013 03:55 AM, Bill Pragnell wrote:
> A slightly more involved test, using chains for demolition instead of balls.
>
> links and save the triangles to an .obj file, which I then converted into .3ds
> for use in the bullet playground using meshlab. During rendering, the meshes are
Very cool! Have you used Meshlab for more than conversions? It's a tool
I've had on my toy-with list for a while, but I've not found the time to
play.
Thomas, Your comment about the man swinging chains through buildings
reminded me of the RGB Mars trilogy where they cut the space elevator
cable. As it came down, it cut a swath across the surface of Mars.
Wonder why we find things crashing so mesmerizing...
Bill P. (the other one)
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Stephen <mca### [at] aol com> wrote:
> On 20/06/2013 8:55 AM, Bill Pragnell wrote:
> > A slightly more involved test, using chains for demolition instead of balls.
>
> And no actual towers were hurt in the making of this video. ;-)
It might have made a few worried though ;-)
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Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
> Amazing... and very nicely rendered, BTW.
Thanks :) I think your car demo was more impressive tho!
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Thomas de Groot <tho### [at] degrootorg> wrote:
> I have just re-read /Skylark of Valeron/ by E.E. Smith (1963 edition of
> the 1934 space opera) where the hero, being stranded in 4th dimension
> hyper-space, swings similar chains, tearing through complete buildings
> and its inhabitants. :-)
I've not read skylark, but I did read the Lensman series once, long ago... this
sounds like regular EE Smith hyperbole :)
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William F Pokorny <ano### [at] anonymousorg> wrote:
> Very cool! Have you used Meshlab for more than conversions? It's a tool
> I've had on my toy-with list for a while, but I've not found the time to
> play.
It's one of those programs you need to pull out when you need it. I don't think
it's really aimed at creation or editing, mainly conversion, tidying and
filtering. It does have a vast array of tools for mesh doctoring...
> Thomas, Your comment about the man swinging chains through buildings
> reminded me of the RGB Mars trilogy where they cut the space elevator
> cable. As it came down, it cut a swath across the surface of Mars.
I've read the first one, the imagery from that sequence really sticks in my mind
even after forgetting most of the rest of the story. As I recall, it looped
around the planet more than once, and the disaster took hours to unfold. I must
read the rest of the series sometime!
> Wonder why we find things crashing so mesmerizing...
I don't know, but it's certainly hypnotizing. I shall continue my odyssey of
collapse - a good excuse to thoroughly find my way around this physics library.
:)
Bill
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On 22/06/2013 4:13 PM, Bill Pragnell wrote:
> Stephen <mca### [at] aolcom> wrote:
>> On 20/06/2013 8:55 AM, Bill Pragnell wrote:
>>> A slightly more involved test, using chains for demolition instead of balls.
>>
>> And no actual towers were hurt in the making of this video. ;-)
>
> It might have made a few worried though ;-)
>
>
But I am sure that you told a different tower that *it* was the one for
the chop. So that all the other towers, including the one you decimated,
were in shock and did not know what was happening.
It was a trick, of some Canadian First Peoples, to anaesthetise the
trees they used for totem poles.
--
Regards
Stephen
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