An F-curve can be edited by transforming the locations of the keyframes.
- Move, Rotate, Scale
Like other elements in Blender, keyframes can be moved, rotated, or scaled as described in Basic Transformations.
For precise control of the keyframe position and value, you can set values in the Active Keyframe of the Sidebar region.
Keyframes can be snapped to different properties by using the Snap Keys tool.
- Current Frame
Snap the selected keyframes to the Playhead.
- Cursor Value
Snap the selected keyframes to the 2D Cursor.
- Nearest Frame
Snap the selected keyframes to their nearest frame individually.
- Nearest Second
Snap the selected keyframes to their nearest second individually, based on the FPS of the scene.
- Nearest Marker
Snap the selected keyframes to their nearest marker individually.
- Flatten Handles
Flatten the Bézier handles for the selected keyframes.
Selected keyframes can be mirrored over different properties using the Mirror Keys tool.
- By Times Over Current Frame
Mirror horizontally over the playhead.
- By Values over Cursor Value
Mirror vertically over the 2D cursor.
- By Times over Time 0
Mirror horizontally over frame 0.
- By Values over Value 0
Mirror vertically over value 0.
- By Times over First Selected Marker
Mirror horizontally over the first selected marker.
Ctrl-LMB inserts a keyframe to the active F-curve at the mouse position. The newly added keyframes will be selected, making it easier to quickly tweak the newly added keyframes. All previously selected keyframes are kept selected by using Shift-Ctrl-LMB.
Add F-Curve Modifier¶
Bake Sound to F-Curves¶
The Bake Sound to F-Curves operator takes a sound file and uses its sound wave to create the animation data.
- Lowest Frequency
Cutoff frequency of a high-pass filter that is applied to the audio data.
- Highest Frequency
Cutoff frequency of a low-pass filter that is applied to the audio data.
- Attack Time
Value for the hull curve calculation that tells how fast the hull curve can rise. The lower the value the steeper it can rise.
- Release Time
Value for the hull curve calculation that tells how fast the hull curve can fall. The lower the value the steeper it can fall.
Minimum amplitude value needed to influence the hull curve.
Only the positive differences of the hull curve amplitudes are summarized to produce the output.
The amplitudes of the hull curve are summarized. If Accumulate is enabled, both positive and negative differences are accumulated.
Gives the output as a square curve. Negative values always result in -1, and positive ones in 1.
- Square Threshold
All values lower than this threshold result in 0.
Jump to Keyframe¶
The Decimate operator simplifies an F-curve by removing keyframes that influence the curve shape the least.
Controls which method is used pick the number of keyframes to use.
Deletes a defined percentage of keyframes, the amount of keyframes to delete is define by the Remove property.
- Error Margin
Deletes keyframes which only allowing the F-curve to change by a defined amount. The amount of change is controlled by the Max Error Margin which controls how much the new decimated curve is allowed to deviate from the original.
Clean Keyframes resets the keyframe tangents on selected keyframes to their auto-clamped shape, if they have been modified.
Acts like the Clean Keyframes operator but will also delete the channel itself if it is only left with a single keyframe containing the default property value and it’s not being used by any generative F-curve modifiers or drivers.
The modified curve left after the Clean tool is run is not the same as the original, so this tool is better used before doing custom editing of F-curves and after initial keyframe insertion, to get rid of any unwanted keyframes inserted while doing mass keyframe insertion (by selecting all bones and pressing I for instance).
There is also an option to smooth the selected curves, but beware: its algorithm seems to be to divide by two the distance between each keyframe and the average linear value of the curve, without any setting, which gives quite a strong smoothing! Note that the first and last keys seem to be never modified by this tool.
Sampling a set of keyframes replaces interpolated values with a new keyframe for each frame.
Baking a curve replaces it with a set of sampled points, and removes the ability to edit the curve.
Discontinuity (Euler) Filter¶