利用者:Aligorith/250 NLA Shapes Actions

Action

An action is a generic container containing various IPO blocks.
IPO blocks are contained in Action Channels.
Action Channels are named, so that users of the Action can retrieve their respective anim data from the right IPO block.
Action Channels may have Constraint Channels attached, which affect the Constraints of Object or Pose Channels (bones)

The Action Editor is where Actions are edited. It is also where the majority of keyframing editing takes place (tweaking/refining of keyframes occurs in IPO editor).
It is equivilant to the dopesheet in many other programs.

There can be several 'modes' like in the IPO editor, so that multiple sets of action/keyframe data can be edited. This means that when an Object is active, you are not restricted to only editing that Object's ob-action. This means that you can choose to edit keyframes from 'IPO-blocks' revelant to the chosen mode.

The NLA Editor is where Actions/ShapeKeys are combined/mixed in a non-destructive, non-linear way.
You can only work with strips representing the Actions/Shapekeys, but not the individual keyframes.
Each block/folder shown in the NLA editor, can get a series of tracks. Tracks are used when overlapping of strips needs to occur. Multiple strips can occur in one track as long as they don't overlap each other.
For each strip, there are specialised curves to control the strength of blending between strips, and also of the timing.
You can choose to: tempolarily disable a track(s) or strip(s), only play one strip/track, or stop a strip/track from being edited.
Each datablock-type has it's own set of NLA data (i.e. Object-Level and Pose-Level NLA-mixing for an Armature are kept separate). This is because mixing actions from different blocktypes is simply not logical.