Fusion Spline Editor: Easing, Speed, Overshoot and Loops
Read curves, shape acceleration, create Loop/PingPong behavior and retime existing motion cleanly.
Two animations with identical keyframe values can feel completely different because of curve shape. The Spline Editor is where linear motion becomes designed motion.
1. Read the curve
The horizontal axis is time and the vertical axis is parameter value. A steep section means rapid change; a flat section means slow change or a hold.
2. Linear, Smooth and Step
Linear creates constant interpolation between keys. Smooth uses tangents for acceleration/deceleration. Step does not interpolate intermediate values and is useful for switches or hard state changes.
3. Shape easing with tangents
There is no universal “good S-curve.” A light UI element, a heavy logo and a camera move need different acceleration. Adjust tangents and judge the animation, not the curve shape in isolation.
4. Overshoot and settle
For a controlled overshoot, let the value pass the target slightly and return. Small amounts—often only a few percent—usually feel more intentional than a large bounce.
5. Loop, PingPong and Relative
Repeat behaviors turn a short animation into a cycle. Loop repeats, PingPong reverses direction, and Relative can continue changing across repetitions. Always inspect the seam between the last and first frame.
6. TimeStretch and duration changes
When an existing animation is too long or short, retime the block instead of moving dozens of keys manually. After stretching, check the speed through the middle of the motion again.
Key takeaway
The Spline Editor controls motion character and speed. A curve is successful when the animation feels right in the Viewer—not when the graph simply looks elegant.
Related lessons
Neon Effects in Fusion: Lines, Glow and Object Outlines
Build the effect in layers: a clean shape, controlled bloom, animation and a separate subject outline.
3D Text in Fusion: Lighting, Animation and a Reusable Edit-Page Macro
Text3D → Merge3D → Renderer3D, materials, camera, Follower animation and publishing useful controls.
Neon Outline in Fusion: Polygon, Glow and Animated Reveals
Draw a clean contour, build two-stage glow and animate Length/Position without turning the graph into a mess.
Need help applying this to a real project?
Live 1-on-1 training is currently available in Russian. You can also send a production task for editing or workflow automation.