vectorSlerp static method

Vector3 vectorSlerp(List<double> inputs, List<Vector3> results, double desiredInput)

Implementation

static Vector3 vectorSlerp(
    List<double> inputs, List<Vector3> results, double desiredInput) {
  var n = inputs.length;
  var inputMin = inputs[0];
  var inputMax = inputs[n - 1];

  // Don't support extrapolation:
  if (desiredInput < inputMin) return results[0];
  if (desiredInput >= inputMax) return results[n - 1];

  // Map to values that correspond to the array index progression
  var percent = inverseLerp(inputMin, inputMax, desiredInput);
  var step = 1 / (n - 1);
  var matchedRangeStartIndex = percent ~/ step;
  var matchedRangePct = (percent % step) / step;

  return lerpUnclamped(
    results[matchedRangeStartIndex],
    results[matchedRangeStartIndex + 1],
    matchedRangePct,
  );
}