added some new params to Particle

src/main/kotlin/com/bytedice/bde_particles/Math.kt

@@ -170,18 +170,9 @@ fun lerp(x: Float, y: Float, t: Float) : Float {
 }
 
 
-fun interpolateCurve(start: Vector3f, end: Vector3f, t: Float, curve: LerpCurves): Vector3f {
-  val clampedT = t.coerceIn(0.0f, 1.0f)
-
-  val curvedT = curve.function(clampedT)
-
-  val interpolatedVec = Vector3f(
-    lerp(start.x, end.x, curvedT),
-    lerp(start.y, end.y, curvedT),
-    lerp(start.z, end.z, curvedT)
-  )
-
-  return interpolatedVec
+fun lerpArray(array: Array<Any>, t: Float, curve: LerpCurves = LerpCurves.Linear) : Any {
+  val idx = round(lerp(0.0f, array.lastIndex.toFloat(), t) * curve.function(t)).toInt()
+  return array[idx]
 }