New: Add easing functions to FunctionScript

[adfriz]

Adds lerp, smoothstep and the full set of Robert Penner easing functions (sine, quad, cubic, quart, quint, expo, circ, back, elastic and bounce, each in in/out/inout variants) to the function script API for the animated objects.

Need more test, examples and documentation...

[adfriz]

Screen.Recording.2026-08-02.152416.mp4

example, not a proper object to animate but at least easy enough to understand.

Full function list

Function	Example	Effect
lerp	lerp[a, b, t]	linear interpolation between two values (t = 0 → a, t = 1 → b)
smoothstep	smoothstep[a, b, x]	Hermite curve; smooth 0→1, ramps only between a and b
easeinsine	easeinsine[t]	starts slow, ends fast
easeoutsine	easeoutsine[t]	starts fast, ends slow
easeinoutsine	easeinoutsine[t]	slow-fast-slow
easeinquad / easeoutquad / easeinoutquad	same pattern	quadratic variant
easeincubic / easeoutcubic / easeinoutcubic	same pattern	cubic variant (most common)
easeinquart / easeoutquart / easeinoutquart	same pattern	quartic variant
easeinquint / easeoutquint / easeinoutquint	same pattern	quintic variant
easeinexpo / easeoutexpo / easeinoutexpo	same pattern	exponential, very aggressive
easeincirc / easeoutcirc / easeinoutcirc	same pattern	circular curve
easeinback / easeoutback / easeinoutback	same pattern	overshoots target (pull-back effect)
easeinelastic / easeoutelastic / easeinoutelastic	same pattern	elastic wobble
easeinbounce / easeoutbounce / easeinoutbounce	same pattern	bounce (e.g. drop-to-ground)

Example of a bouncy drop:

TranslateYFunction = (1 - easeoutbounce[mod[time, 4] / 4]) * 1.5

Notes

• Inputs outside 0..1 are not clamped — back/elastic/bounce intentionally exceed the range mid-curve (that's their overshoot).
• For state-driven animations, use if[...] with a value + delta * speed accumulator; plain mod[time, x] resets abruptly (snaps), so wrap it in min[mod[time, x], x - mod[time, x]] or a cosine carrier if you need continuous motion.ap it in min[mod[time, x], x - mod[time, x]] or a cosine carrier if you need continuous motion.
• t is usually your formula

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@leezer3 what do you think? maybe i should not include the lerp?

[leezer3]

I suspect that lerp is probably actually the most useful of these actually.
slerp might also be useful, but really the limitations of the animated format are going to start hitting when you get really complex- fundamentally at the minute there's no way to chain animation positions.