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The animation editor lets you view and edit animated parameters and how
Houdini fills in the transitions between keyframes. You can use the
graph editor view (shows changes in parameter values over time as a graph), the 
parameter table view (shows parameter values at
each keyframe in a table), or the dopesheet view to edit animation. To switch between these views, use the pop-up menu at the top left of the pane.
Tips
-
You can click
on a channel group in the animation editor and choose Motion Effects > Create Clip to create a single 
Channel CHOP, moving all the channels in that group to it. Alternatively, if you have multiple channels scoped on the playbar, you can also do the same by right-clicking on the playbar. -
To create channel groups for a particular node, you can click
on the node in the Network View and choose Create Nested Channel Groups. -
The animation editor can have a sub-pane containing a channel list . If you already have a channel list pane open, drag the divider divider left to hide the animation editor’s channel list sub-pane.
Common toolbar controls
Switches the pane to graph view.
Switches the pane to table view.
Switches the pane to dopesheet view.
Scope menu
Lets you choose parameters to view from a menu of all available parameters. To add this menu to the toolbar, choose View > Show Scope Button.
Filter field
Only shows parameters that match the given pattern. You can choose common patterns from the pop-up menu at the right end of the field. To add this menu to the toolbar, choose View > Show Filter Field.
Template field
Templates parameters that match the given pattern so they are unselectable. This is useful to get parameters out of you way so you don’t accidentally select them while you work on other parameters. To add this menu to the toolbar, choose View > Show Template Field.
Channel drop-down menu
Lets you choose whether you want to view all channels on one graph, or each channel separately on an individual graph.
Graph drop-down menu
This menu is enabled when you choose Graph Per Channel in the channel drop down menu. It allows you to choose how many graphs you wish to view in the pane.
Homes all channels by panning and zooming the graph to show all keys in the current graph or all graphs.
Pans and zooms the graph to keep all horizontal values visible.
Pans and zooms the graph to keep all vertical values visible.
Start Frame/End Frame
Displays the start and end frames of the sequence.
Jumps to the previous keyframe.
Jumps to the next keyframe.
Launches the help browser.
Function toolbar
All of the channels in Houdini are default bezier. The buttons on the function toolbar do not change the type of curve. For example, in earlier versions clicking the line button would set the mathematical equation for the channel to become linear. Now when you click the line button the curve will remain bezier and the handles will line up.
Note
You can still change the type of curve by selecting a different one from Function pop-up menu.
Frame range slider
The timeline slider below the graph controls the range of frames displayed in the graph. Drag the left edge to change the first frame shown in the graph. Drag the right edge to change the last frame shown. Drag the middle to move the range along the timeline.
You can also type exact start and end frame numbers in the text boxes on either side of the slider.
For more information see playbar help.