[Bf-committers] 2.49: prevent reading 2.5+ ?

[Ton Roosendaal]

Hi Erwin,

Old blenders reading new files was as its best instable.
A 2.48 saved file crashes in 2.3x even. It does read in 2.40 though.

I really like forward compatibility for updates, and always challenge 
devs to think of good incremental ways to add functionality, so it 
still reads OK in older binaries.

Concepts and designs for Mesh and Ipo were 15 years old now, and really 
at the end of their lifecycle. They just have too many limits 
by-design.
Keeping "the old data" around, or some way to "convert back" is 
impossible or frustrating at best, since the redesign incorporates 
features we didn't have in the old data, which again is the reason why 
we choose to upgrade. :)

-Ton-

------------------------------------------------------------------------
Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
Blender Institute BV  Entrepotdok 57A  1018AD Amsterdam The Netherlands

On 14 Apr, 2009, at 1:09, blender at erwincoumans.com wrote:

>
> It hasn't happen before: old Blender versions from 1999 can still read
> objects, meshes, camera and ipo/animation curves from todays Blender, 
> and
> vise versa.
>
> Obviously an older Blender version will skip the new/unknown data, the
> concern is about known data.
>
>
> Martin Poirier writes:
>
>>
>>
>> --- On Mon, 4/13/09, Roger Wickes <rogerwickes at yahoo.com> wrote:
>>
>>> so what is the recommended procedure - export to Collada?
>>
>> The recommended procedure is to use 2.5+ with those files.
>>
>> I don't see why that's such a big deal, the same thing happened lots 
>> of time in the past already (fluids, particles, softbody, armatures, 
>> nodes, ...), the only difference is that now we want to give a better 
>> warning instead of just dropping data on forward incompatibility.
>>
>> There's no problem for backward compat though, this is taken care of.
>>
>> Martin
>>
>>
>>       
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