Easing & Interpolation Catalog

API status — PROPOSED, NOT IMPLEMENTED. SkCine is currently a design specification in this conversation; no built SkCine.jar or syntax registry was supplied. All SkCine-specific examples are intended API contracts, not verified runnable .sk. Do not advertise these as tested until each example passes a real Skript reload and runtime test.

Named easing curves

Family	in	out	in-out	Characteristics
Linear	`linear`	—	—	Constant speed
Sine	`ease-in-sine`	`ease-out-sine`	`ease-in-out-sine`	Soft stops
Quadratic	`ease-in-quad`	`ease-out-quad`	`ease-in-out-quad`	Simple acceleration
Cubic	`ease-in-cubic`	`ease-out-cubic`	`ease-in-out-cubic`	Smooth cinematic travel
Quartic	`ease-in-quart`	`ease-out-quart`	`ease-in-out-quart`	Stronger emphasis
Quintic	`ease-in-quint`	`ease-out-quint`	`ease-in-out-quint`	Dramatic ease
Exponential	`ease-in-expo`	`ease-out-expo`	`ease-in-out-expo`	Abrupt near endpoints
Circular	`ease-in-circ`	`ease-out-circ`	`ease-in-out-circ`	Circular time profile
Back	`ease-in-back`	`ease-out-back`	`ease-in-out-back`	Overshoots bounds
Bounce	`ease-in-bounce`	`ease-out-bounce`	`ease-in-out-bounce`	Impact motion
Elastic	`ease-in-elastic`	`ease-out-elastic`	`ease-in-out-elastic`	Spring overshoot
Smoothstep	`smoothstep`	—	—	Polynomial smooth
Smootherstep	`smootherstep`	—	—	Continuous 2nd derivatives at ends

Spatial curve types

linear, bezier, catmull-rom, hermite, and rotational quaternion slerp are path interpolation families, not interchangeable easing functions. SkCine should expose path interpolation and time easing as separate properties.

Domain contract

The easing function accepts normalized t in [0,1]. Bounce/back/elastic can output outside [0,1]; the property must decide whether to clamp (opacity/scale) or permit overshoot (position).

Example

set cine easing of {_camera} to "ease-in-out-cubic"
set {_half} to cine easing value 0.5 using "ease-in-out-cubic"

Test t=0, t=1, continuity, no NaN, quaternion hemisphere shortest-path handling and axis wraps.