Interpolate¶

Reference

Mode:: Draw Mode
Tool:: Toolbar ‣ Interpolate

The Interpolate tool creates an in-between keyframe by interpolating strokes between the previous and next Grease Pencil keyframes. When used on a frame between two keyframes, clicking and dragging will add a new breakdown keyframe, interpolating the stroke’s shape based on the drag distance.

This allows artists to manually control how strokes evolve between poses or drawings, providing fine control over the interpolation result.

Note

When interpolating between curves of different types, a priority system determines which curve type is used. The priority from highest to lowest is: NURBS –> Bézier –> Catmull-Rom –> Polyline.

Usage¶

Place the timeline playhead between two existing Grease Pencil keyframes.
In the 3D Viewport, click and drag left to right to set the desired interpolation factor.
Release the mouse button to confirm and create a new breakdown keyframe.

The resulting keyframe contains strokes that are interpolated between the neighboring keyframes according to the chosen factor.

Tool Settings¶

Layer: Restrict interpolation to either the Active Layer or All Layers.
Only Selected (Edit Mode): When enabled, only selected strokes will be interpolated.
Exclude Breakdowns: Exclude existing Breakdown keyframes from being used as interpolation extremes.
Flip Mode: Reverses the interpolation direction, swapping the start and end strokes. Automatic mode attempts to determine the correct direction for each stroke automatically.
Smooth: The amount of smoothing applied to interpolated strokes to reduce jitter or visual noise.
Iterations: The number of times smoothing is applied to newly created strokes. Higher values result in smoother interpolation but may reduce shape fidelity.