[Bf-python] RE: action / NLA api

[Roland Hess]

Hi folks. The implementation I'm on working is this:

In the n-key panel and regular buttons panel for an action strip , 
the user can select a Bone from a drop-down menu of all bones in the 
armature that the currently selected action strip is attached to. 
That's all the user interaction.

Every time there's an edit to the NLA, the code follows the NLA chain 
and calculates and caches a cumulative transform matrix for each 
action strip, building on the previous, so that when NLA is solved 
for display, it can quickly apply a single transform to the result, 
based on the top-most action strip at the active frame.

The API for something like this could be as simple as:

strip.matchbone.set("foot.b.left")
strip.matchbone.get()
strip.matchbone.clear()

The match bone is a property of the Action Strip. It uses the already 
existing blendin/blendout values for smoothness. The one thing you'd 
want to determine would be whether or not the .set("foo") would take 
a string, like I've shown here, or would take a Bone object as it's 
argument. The actual code (right now) stores a pointer to a bone, so 
if you wanted to accept a string, you'd have to do an object lookup 
based on the name.

That's all!
-- 
Roland Hess - harkyman