public Vector3 RoadCenterAt(float distanceFromStart, out bool done, out Vector3 direction)
{
var segments = Math.Round(CachedNodes.Length * 100 * SegmentRate);
var nodePositions = CachedNodes.Select(x => x.transform.localPosition).ToArray();
float lengthSeen = 0;
for (int i = 0; i <= segments; i++)
{
var s = i / (float)segments;
var center = MathfPlus.BSpline(nodePositions, s);
Vector3 nextCenter = MathfPlus.BSpline(nodePositions, (i + 1) / (float)segments);
direction = nextCenter - center;
var segmentLength = Vector3.Distance(nextCenter, center);
lengthSeen += segmentLength;
if (lengthSeen > distanceFromStart)
{
float distanceAtLastSegment = lengthSeen - segmentLength;
done = false;
return(transform.localToWorldMatrix * MathfPlus.PadVector3(Vector3.Lerp(center, nextCenter, (distanceFromStart - distanceAtLastSegment) / (lengthSeen - distanceAtLastSegment))));
}
}
// fallback : at distance = 0
done = true;
direction = Vector3.zero;
return(Vector3.zero);
}