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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 ¶
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You can click RMB 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 in the channel list 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 RMB on the node in the Network View and choose Create Nested Channel Groups.
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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.
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.
Smooth Keyframes on Selected Channels options window ¶
You can access the Smooth Keyframes on Selected Channels options window by selecting Edit ▸ Smooth Selected Channels from the menu bar.
This window allows you to apply smoothing to selected animation channels by removing unwanted jitter and noise from them.
Note
This window’s options provide the same functionality as the 
SmoothMotion SOP node, but for the Animation Editor.
Filter Type
Specifies which type of low-pass filter to smooth the channels with. Currently only Butterworth Filter is available.
Cutoff Frequency
Sets the cutoff frequency for the filter. Frequencies higher than this value will be filtered out/removed on the output.
Filter Order
Sets the order of the filter. This determines how steeply the filter curve rolls off after the cutoff frequency. Higher orders correspond to steeper roll off.
Range
Determines what range of the channels to apply the smoothing to.
Full Channel
Apply the filter to the full channel.
Selection Only
Apply the filter to just the selected portion of the channel.
Playbar Range
Apply the filter to only the range specified in the playbar.
Sampling Rate
Specifies the samples-per-second rate. Keys are added to their channels at this sampling rate.
Snap Keys
When on, any keys that would be placed at fractional frames are instead snapped to integer frames.