Hello,

I post a new animation of 2 objects falling in a tank of water. One object
is a wood box, the other one is a steel sphere. The target was to test the
different interactions water <-> object <-> object.

The video is MPEG1 encoded.

Any comment is wellcome.

Regards,
Fidos.

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Attachments:
Download 'box.mpg' (693 KB)

fidos wrote:
> Hello,
> 
> I post a new animation of 2 objects falling in a tank of water. One object
> is a wood box, the other one is a steel sphere. The target was to test the
> different interactions water <-> object <-> object.
> 
> The video is MPEG1 encoded.
> 
> Any comment is wellcome.
> 
> Regards,
> Fidos.

Fantastic work fidos. I love these simulations you've been working on! 
The wood block seems to behave a bit funny here, maybe that's just 
because I don't have any personal experience with dropping a steal ball 
and a block of wood into a tank? ;) It sort of looks like the wooden 
block is not dense enough compared to the steel ball?

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Thomas Lake wrote:
> Fantastic work fidos. I love these simulations you've been working on! 
> The wood block seems to behave a bit funny here, maybe that's just 
> because I don't have any personal experience with dropping a steal ball 
> and a block of wood into a tank? ;) It sort of looks like the wooden 
> block is not dense enough compared to the steel ball?

This is a major limitation of the ODE library, that all objects have the 
same density.

...Chambers

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>and a block of wood into a tank? ;) It sort of looks like the wooden 
>block is not dense enough compared to the steel ball?

Unless it is made of balsa wood.  :-P



Kyle

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Thomas Lake <smi### [at] hotmailcom> wrote:
> fidos wrote:
> > Hello,
> >
> > I post a new animation of 2 objects falling in a tank of water. One object
> > is a wood box, the other one is a steel sphere. The target was to test the
> > different interactions water <-> object <-> object.
> >
> > The video is MPEG1 encoded.
> >
> > Any comment is wellcome.
> >
> > Regards,
> > Fidos.
>
> Fantastic work fidos. I love these simulations you've been working on!
> The wood block seems to behave a bit funny here, maybe that's just
> because I don't have any personal experience with dropping a steal ball
> and a block of wood into a tank? ;) It sort of looks like the wooden
> block is not dense enough compared to the steel ball?
Thank you. I used a density of 0.25 for the wood and 1 for the steel. I know
that it is not realistic (not enough for both) but I wanted to have good
reaction of the box when the ball fall on it.

Regards,
Fidos.

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Ben Chambers <ben### [at] pacificwebguycom> wrote:
> Thomas Lake wrote:
> > Fantastic work fidos. I love these simulations you've been working on!
> > The wood block seems to behave a bit funny here, maybe that's just
> > because I don't have any personal experience with dropping a steal ball
> > and a block of wood into a tank? ;) It sort of looks like the wooden
> > block is not dense enough compared to the steel ball?
>
> This is a major limitation of the ODE library, that all objects have the
> same density.
>
> ...Chambers

You can use the function dMassSetSphere(density) in case of a sphere to init
a dMass structure and after call the function dBodySetMass to attach the
mass to the body. It is what I do in my simulation.

Regards,
Fidos.

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fidos scripsit::
> Thomas Lake <smi### [at] hotmailcom> wrote:
>> fidos wrote:
>>> Hello,
>>>
>>> I post a new animation of 2 objects falling in a tank of water. One object
>>> is a wood box, the other one is a steel sphere. The target was to test the
>>> different interactions water <-> object <-> object.
>>>
>>> The video is MPEG1 encoded.
>>>
>>> Any comment is wellcome.
>>>
>>> Regards,
>>> Fidos.
>> Fantastic work fidos. I love these simulations you've been working on!
>> The wood block seems to behave a bit funny here, maybe that's just
>> because I don't have any personal experience with dropping a steal ball
>> and a block of wood into a tank? ;) It sort of looks like the wooden
>> block is not dense enough compared to the steel ball?
> Thank you. I used a density of 0.25 for the wood and 1 for the steel. I know
> that it is not realistic (not enough for both) but I wanted to have good
> reaction of the box when the ball fall on it.

Steel: density about 8
water: density of 1
wood: typical density between 0.5 and 1.1 (ebony), using 0.9 ?




-- 
Eifersucht ist die Leidenschaft, die mit Eifer sucht, was Leiden
schafft.

Eco: -8.75 Soc: -6.72
http://www.politicalcompass.org/

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