If you remember the cloth simulator I did for my latest IRTC entry, and 
of which I'd posted a couple of samples two month ago, I've just put a 
new version online. The core simulation engine is exactly the same, but 
now it reads its parameters from a file, so you don't need to recompile 
eache time (and you don't need to understand C++ to use it ;) You'll 
find the source code (GPLed), a linux binary (works on my machine, I 
don't guarantee it'll work anywhere else though) and and the doc at this 
address:
http://www.enst.fr/~jberger/cloth/cloth.html

	If somebody makes a dos/win binary, please let me know so I can add a link.

	As time permits (and depending on my needs), I plan to add the following 
(no particular order):

* a realistic friction model (the current one is pure fantasy);
* a dynamic simulation model (plus animation facilities and wind);
* use the semi-solid cloth model (should allow faster simulation);
* handle self-collisions;
* ability to read/write the cloth in a file;
* ability to attach the cloth (like hanging curtains);
* other objects to interact with;
* ...

	If you have other ideas, or if you'd like some features to be implemented 
first, don't hesitate to tell it!

		Jerome
-- 

* Abandon the search for truth, * mailto:ber### [at] inamecom
* Settle for a good fantasy.    * http://www.enst.fr/~jberger
*********************************

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> 
>         If you remember the cloth simulator I did for my latest IRTC entry, and
> of which I'd posted a couple of samples two month ago, I've just put a
> new version online. The core simulation engine is exactly the same, but
> now it reads its parameters from a file, so you don't need to recompile
> eache time (and you don't need to understand C++ to use it ;) You'll
> find the source code (GPLed), a linux binary (works on my machine, I
> don't guarantee it'll work anywhere else though) and and the doc at this
> address:
> http://www.enst.fr/~jberger/cloth/cloth.html
> 
>         If somebody makes a dos/win binary, please let me know so I can add a link.

When compiling it with cygwin, it only complained about the 'if
(!isfinite(tmp))' in vector.cc.  I just commented it out to get it running
and it worked nice although with the sample parameters in the docu, it
generated 'NaN' values in the output.

I doubt these two things are related because the 'if (!isfinite(tmp))'
construction would not even finish the calculation.  

I don't know any C++ so i would appreciate some info about both the 'NaN'
output and the isfinite() function

>         As time permits (and depending on my needs), I plan to add the following
> (no particular order):
> 
> * a realistic friction model (the current one is pure fantasy);
> * a dynamic simulation model (plus animation facilities and wind);
> * use the semi-solid cloth model (should allow faster simulation);
> * handle self-collisions;
> * ability to read/write the cloth in a file;
> * ability to attach the cloth (like hanging curtains);
> * other objects to interact with;
> * ...
> 
>         If you have other ideas, or if you'd like some features to be implemented
> first, don't hesitate to tell it!
> 

Have you thought about adding it directly to Povray? that would make it
possible to use all Povray object for collision. 

Another nice thing would be smooth meshes.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Christoph Hormann wrote in message <3A71BCBD.2B3F1FA4@gmx.de>...
>

>>
>>         If you remember the cloth simulator I did for my latest IRTC
entry, and
>> of which I'd posted a couple of samples two month ago, I've just put a
>> new version online. The core simulation engine is exactly the same, but
>> now it reads its parameters from a file, so you don't need to recompile
>> eache time

And just today I'd started making these modifications to version 0.0.0 :-)

>When compiling it with cygwin, it only complained about the 'if
>(!isfinite(tmp))' in vector.cc.  I just commented it out to get it running
>and it worked nice although with the sample parameters in the docu, it
>generated 'NaN' values in the output.


The algorithm used is numerically unstable.  Under certain circumstances,
points will start heading off towards infinity.  isinfinite() attempts to
detect this and currently stops calculations with an error.

>>
>>         If you have other ideas, or if you'd like some features to be
implemented
>> first, don't hesitate to tell it!


If you haven't already implemented it, I'd like interaction with spheres (or
even better, blobs ;-).

--
Mark

Post a reply to this message

Mark Wagner wrote in message <3a725c3c@news.povray.org>...

>If you haven't already implemented it, I'd like interaction with spheres
(or
>even better, blobs ;-).


Additional suggestion: Replace the #version unofficial MegaPov 0.6; wit
#version unofficial MegaPov 0.3;.  Mesh2 only requires 0.3, and for those of
us using older versions of MegaPOV, it would be nice not to need to change
this in every file.

--
Mark

Post a reply to this message

Mark Wagner wrote:
> 
> The algorithm used is numerically unstable.  Under certain circumstances,
> points will start heading off towards infinity.  isinfinite() attempts to
> detect this and currently stops calculations with an error.
> 


suggested - I wouldn't expect such differences between linux and cygwin. 
I added 'hnoise' and 'vnoise' to the .cl file and it works ok now (with
'(!isfinite(tmp))' replaced by '(tmp>1e300)').

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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Could you make the Windows Version public in one way or another (of course

compiler here and not even basic knowledge about using one, but I would
really love to try the program.

Marc-Hendrik

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Marc-Hendrik Bremer schrieb in Nachricht <3a74a585$1@news.povray.org>...
>Could you make the Windows Version public in one way or another (of course


If you don't want to make it public, that is .... :-/

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God bless you, you kind, intelligent man! I don't visit p.b.u often enough.
I would really appreciate a dos/win compile if anyone can slap one together.
Keep up the good work Jerome! :)

Post a reply to this message

Marc-Hendrik Bremer wrote:
> 
> Could you make the Windows Version public in one way or another (of course

> compiler here and not even basic knowledge about using one, but I would
> really love to try the program.
> 
> Marc-Hendrik

Please wait till the afternoon :-) 

I am working on some general changes of the website so i thought about
putting it there later, but will do it sooner now.  Anyway, real life is
demanding this morning so...

It's made with cygwin so you will need the cygwin DLL just like for
PovCyg.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message

Christoph Hormann schrieb in Nachricht <3A7### [at] gmxde>...
>Please wait till the afternoon :-)
>


Of course :-)

>It's made with cygwin so you will need the cygwin DLL just like for
>PovCyg.


Can I find that DLL in the cygwin-package? I thing I have it on one of the
c't shareware CD's ...?

Thanks,

Marc-Hendrik

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