sineOut: Sinusoidal Deceleration

Smooth trigonometric deceleration with natural curved completion

The sineOut function creates gentle deceleration through direct sinusoidal mapping. This produces smooth curved motion that decelerates naturally without the sharpness of polynomial alternatives.

$f(t) = \sin\left(t \cdot \frac{\pi}{2}\right)$

The sinusoidal relationship provides smoother deceleration than linear functions while maintaining gentler characteristics than polynomial curves, creating naturally flowing completion phases.

ライブエディター

const fragment = () => {
  const w = 0.01
  const t = iTime.fract()
  const y = sineOut(t)
  const Y = sineOut(uv.x)
  const a = vec3(0.4, 0.7, 0.9)
  const b = vec3(0.9, 0.5, 0.2)
  const c = a.mix(b, y).mul(uv.x.step(t))
  const lines = mmin2(smoothstep(0, w, uv.mod(0.1).min(uv.sub(vec2(t, y)).abs())))
  const curve = stroke(uv.y.sub(Y), 0, w).mul(c)
  const color = lines.oneMinus().mul(0.2).add(curve)
  return vec4(color, 1)
}