[Bf-committers] Modifiers design

[Campbell Barton]

correction, modifiers can call BKE functions, however I was getting
linking errors with some BKE functions, I moved these to files,
 source/blender/modifiers/intern/MOD_boolean_util.c
 source/blender/modifiers/intern/MOD_fluidsim_util.c

When linking the libraries in the reverse order the exten's from
MOD_modifiertypes.h couldnt be found by BKE

On Tue, Apr 20, 2010 at 4:00 PM, Campbell Barton <ideasman42 at gmail.com> wrote:
> 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
>



-- 
- Campbell