[Bf-taskforce25] RNA-IPO

[Roland Hess]

Actions are lists of channels, which are links to Ipo blocks together 
with some flags for how that Ipo block is evaluated. So an Action is 
like a grab bag full of Ipo blocks. It's not so much that there is a 
distinction as that they are not even the same thing.

The stoopid part about Actions is that the channels are positively 
linked to the Ipo block by a pointer, but only matched up with the bones 
of any Object they animate are attached to through string comparisons 
(strcmp(actionchannelname,posechannelname).)

And, while you can directly manipulate the location of keys along the 
timeline, which in turn affects the linked Ipo curves, it can happen on 
many at once and you cannot directly edit the curves in the Action 
Editor. We still need both Action blocks and Ipo blocks as library data. 
Neither are redundant.

Roland

 > It does bring up this problem yes, what is the distinction between an
 > Action and an IPO-block? Is it even useful to make a distinction?
 > Maybe we don't need one, and an IPO block is just an Action that is
 > owned by the ID block, and IPO blocks are redundant.
 >
 > Brecht.