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);
}
void Rebuild()
{
var vertices = new List <Vector3>();
var triangles = new List <int>();
var uv = new List <Vector2>();
var nodePositions = CachedNodes.Select(x => x.transform.localPosition).ToArray();
SplineMesh.Clear();
SplineMesh.subMeshCount = 1;
RoadTotalLength = 0;
var segments = Math.Round(CachedNodes.Length * 100 * SegmentRate);
float accumulatedTexCoord = 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);
var diff = Vector3.Normalize(nextCenter - center);
var tangent = Vector3.Cross(diff, Vector3.up);
var c = vertices.Count;
var segmentLength = Vector3.Distance(nextCenter, center);
RoadTotalLength += segmentLength;
accumulatedTexCoord += segmentLength * 0.1f;
vertices.Add(center - tangent * Width); uv.Add(new Vector2(0, accumulatedTexCoord));
vertices.Add(center + tangent * Width); uv.Add(new Vector2(1, accumulatedTexCoord));
if (i != segments)
{
triangles.Add(c); triangles.Add(c + 1); triangles.Add(c + 2);
triangles.Add(c + 2); triangles.Add(c + 1); triangles.Add(c + 3);
triangles.Add(c); triangles.Add(c + 2); triangles.Add(c + 1);
triangles.Add(c + 2); triangles.Add(c + 3); triangles.Add(c + 1);
}
}
if (vertices.Count > 0)
{
try
{
SplineMesh.vertices = vertices.ToArray();
SplineMesh.uv = uv.ToArray();
SplineMesh.SetTriangles(triangles.ToArray(), 0);
SplineMesh.RecalculateNormals();
SplineMesh.RecalculateBounds();
SplineMesh.Optimize();
}
catch (Exception exception)
{
Debug.Log(exception.Message);
}
}
}
