[Bf-committers] Delta-Actions inside NLA

Joshua Leung aligorith at gmail.com
Sat May 12 13:31:05 CEST 2012


This feature unfortunately doesn't exist... yet  :/

It was planned to be there from the start, and is one of the things
still missing which would otherwise actually start making the NLA
usable for some of the kinds of things I had in mind when redesigning
it. However, at the time I hit one or two snags, and then other stuff
kindof got in the way, so this never really got addressed.

So, the lack of documentation on this kindof reflects the absent state
of affairs here...


On Sat, May 12, 2012 at 11:26 PM, Tobias Oelgarte
<tobias.oelgarte at googlemail.com> wrote:
> Hello,
> I searched all over the net and i did not find any information about how
> i can insert delta keys to an action. To give an better understanding I
> will describe the scenario.
> I have an very simple "default/normal" action that moves a bone from x=0
> (Frame:1) to x=1 (Frame:40). The I added it as a strip to the NLA. Now i
> create a second action that is exactly the same (for this example). I
> add it as a strip as well and change it to "Blending=add".
> Now i have a motion from x=0 (Frame:1) to x=2 (Frame:40), since x = xn +
> xd. Anything right so far and as expected.
> The problem starts if i want to insert only the delta information as a
> key. Lets say i go to  Frame 40 and press "Insert Key", then the
> delta-action will contain the key (x=2=location.x, Frame:40). But what
> it should insert is: (x=1=location.x - default.location.x), so that the
> sum of both actions is x=2.
> In other words: I want to insert keys relative to the other
> actions/strips that already affect the object/bone.
> Is there some kind of hidden feature that allows such a kind of relative
> (delta) animation keying?
> To illustrate the issue i uploaded an small example file. If you set a
> key for x, then you should directly see that it is not the wanted
> behaviour in this case. It inserts x=2, but there should be an option to
> insert x=1, since the lower action moves it already to x=1, and the sum
> would be "x=2".
> File: http://www.pasteall.org/blend/13873
> Would be really nice if this would be possible with Blender to create
> slight variations of existing animations.
> Greetings from
> Tobias Oelgarte
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