C# How to Align Planes?

Dear C# Friends!
I would like to divide a Curve and generate a list of Planes,
How could I align the planes as Gh Component Perp Frames does it?
I try to Rotate them (plane.Rotate) but How you could compute a delta Vector3d for all the planes?

private void RunScript(Curve curve, int n, bool alignPlanes, ref object A, ref object B, ref object C)

//Create an Array of Point3d

//var points = new Point3d[n+1];

Point3d[] points;
var p = curve.DivideByCount(n, true, out points);

List<Plane> planes = new List<Plane>();
List<Vector3d> vN = new List<Vector3d>();

// How to comoute a Delta Vector??
Vector3d vectorDelta = new Vector3d(Vector3d.ZAxis);

for (int i = 0; i < n + 1 ; i++){


  Plane plane = new Plane(points[i], vN[i]);
  // HOw to align all the planes as Perp Frames Gh Component does?
  if (alignPlanes){plane.Rotate(0, vN[i]);}



A = points;
B = vN;
C = planes;

CurveDivideByCount-CurveTangentAt.gh (17.1 KB)

Have you tried Curve.GetPerpendicularFrames?


Generate a separate list with only your t vales (as you already do) and provide that list as the ‘parameters’. Done.

// Rolf


Thanks RIL!
It is working now!

private void RunScript(Curve curve, int n, ref object A, ref object B, ref object C)
// Create an empty array of planes
Plane planes = new Plane[n];

// Create an empty array of points
Point3d[] points;

// Divide curve into n
//// Curve.DivideByCount Method (Int32, Boolean,Point3d[])
//// https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Curve_DivideByCount_1.htm
var t = curve.DivideByCount(n, true, out points); // T values

// Get Perpendicular planes
//// Curve.GetPerpendicularFrames Method
//// https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Curve_GetPerpendicularFrames.htm
planes = curve.GetPerpendicularFrames(t);

A = t;
B = points;
C = planes;


CurveGetPerpendicularFrames.gh (8.1 KB)