[Bf-committers] Help with the node editor

[Lukas Tönne]

The id and from pointers are set in the snode_set_context function in
node_edit.c. They describe the context origin (from, what kind of data
block from context defines the node tree, usually the active object),
and the actual owning data block of the node tree (id). They id
pointer is a way to let the node editor explicitly trigger updates of
the respective id datablocks (preview drawing).

For the upcoming custom nodes [1] i'd like to replace this scattered
and rather confusing feature with a callback function for tree types
in some way, to avoid storing such explicit information directly in
the node editor DNA.

[1]
https://www.gitorious.org/~lukastoenne/blenderprojects/blender-lukastoenne/commits/custom_nodes

On Fri, Apr 6, 2012 at 9:36 PM, Fabio Massaioli
<fabio.massaioli at virgilio.it> wrote:
> Hi,
> I'm trying to understand the node editor code and I haven't been able so
> far to figure out where the "id" and "from" properties of the "SpaceNode"
> structure are set. I suppose there should be some code that changes those
> members on selection change.
> Can you tell me something about that?
> Thanks in advance.
>
> Fabio Massaioli
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