[Bf-committers] [Bf-blender-cvs] SVN commit: /data/svn/bf-blender [15734] trunk/blender/source/blender/ blenkernel/intern/softbody.c: soft body bug fix own finding

[Diego Hernan Borghetti]

On Thu, 24 Jul 2008, bjornmose wrote:

> Martin Poirier schrieb:
>>
>> --- On Thu, 7/24/08, Jens Ole Wund <bjornmose at gmx.net> wrote:
>>
>>
>>> Revision: 15734
>>>
>>> http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=15734
>>> Author:   bjornmose
>>> Date:     2008-07-24 14:27:31 +0200 (Thu, 24 Jul 2008)
>>>
>>> Log Message:
>>> -----------
>>>
>>
>> <snip>
>>
>>
>>> -adapted effect of wind and fields on softbodies such that
>>> softbody "particles" and particle
>>> "particles" behave consistently
>>> note!
>>> effect of wind is 1/25 compared to before
>>> other forces 1/10
>>>
>>
>> Hi,
>>
>> Wouldn't it be good to add some do versions code in that case so that old files work consistently (backward compat) after this change?
>>
>> Martin
>>
>>
>>
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>>
>>
> Would be nice to be backward compatible. But, that is not that easy.
> Wind and other effectors settings work layer global on all objects, that
> is particles and soft bodies.
> The problem is there is no convention on the units, so every system
> scales it ad hoc.The scale constants are hard coded and not stored in
> the .blend.
> It is even worse, since some of the effectors yield direct forces
> instead of indicating a media moving, which is physically wrong and the
> softbody code cares for that.
> /* See: a particle in moving media (alias wind) will synchronize it's
> motion to the meadia and not accelerate for ever as in a force field.
> So seen strictly  effectors have to accumulate movement and forces
> separatly .. AFAIK only soft bodies are asking the effectos to do that
> And yes, the code is that bad :(  All i did try to hide the mess to
> users **sigh**  */
> Setting the scale values on object level while loading the file won't
> work for several reasons:
> 1. old files loaded will behave back compat until saved with the new
> version tag
> 2. for newly added effectors, should  the old scale be used or the new one?
> 3. how to keep track on mixed effector --> victim realations .. storing
> that matrix to the .blend is overkill IMHO and will lead to confusion
> why objects act different depending on their 'birth date'.
>
> I'd be more than happy to resolve that but was running out of ideas to
> do it right .. any help ?
> BM
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Hello,

  It's fine merge this to the stable branch now, or it's better wait a 
little more to see if you found a solution to the backward problem ?

-- 
 			Diego