[Bf-committers] Modifiers design

[Campbell Barton]

This week I'll look into having modifiers be able to call BKE func's
again, there was a circular dependency between the modifiers and
blenderkernel but there are a few ways this can be resolved.

On Tue, Apr 20, 2010 at 11:42 AM, Brecht Van Lommel <brecht at blender.org> wrote:
> Hi,
>
> This is not good software architecture, but it would need much deeper
> changes to fix. Blenlib is intended to be a library with more generic
> data structures, like lists, hashes, not something specific like
> DerivedMesh. And you can't pull DerivedMesh out of blenkernel without
> creating a two way dependency between these then. It may be good to
> split up blenkernel some day but this is better done if there is a
> bigger design behind it, for now you can assume the modifiers to be
> part of blenkernel, they were just moved into a separate directory for
> convenience.
>
> Brecht.
>
> On Tue, Apr 20, 2010 at 10:30 AM, j.bakker at atmind.nl <j.bakker at atmind.nl> wrote:
>>
>>
>> In April 2010 the modifiers are moved out of the kernel and into MOD_*
>> libraries.
>> http://www.pasteall.org/pic/2818 (old situation)
>>
>> Modifiers are called from within the kernel and modifiers uses (and
>> creates) DerivedMeshes as result. DerivedMeshes are also located in the
>> kernel.
>> http://www.pasteall.org/pic/2819 (current situation)
>>
>> Software architecture at the moment in this area is not well formalized.
>> The Blender kernel regulates modifiers. Modifiers initiates DerivedMeshes.
>> DerivedMeshes are at the moment located in the Blender kernel. In software
>> architecture point of view it is better to place DerivedMeshes in Blender
>> library. As DerivedMeshes are used in more places in the kernel this task
>> can be complicated.
>>
>> I want to suggest to move DerivedMeshes to Blender library. It will make
>> the dependancies and responsibilities between the different libraries
>> clearer.
>> http://www.pasteall.org/pic/2820 (proposed situation)
>>
>> What do you all think?
>>
>> Jeroen Bakker.
>>
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-- 
- Campbell