Question How to dynamically create smooth cylinders using the spline function

Hi,

I asked the same question in "Scripting", but I found this one and am posting it again.

I'm trying to create a mesh by dynamically inputting coordinate values using the spline function.
Mesh creation is successful, but does not result in a Catmull Rom curve.

I made the following code.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using System.Linq;
4. using UnityEngine;
5. using UnityEngine.Splines;
6.  
7. public class CreateSpline : MonoBehaviour
8. {
9.     private SplineContainer _splineContainer;
10.     private SplineExtrude _splineExtrude;
11.     private Spline _spline;
12.  
13.     [SerializeField] GameObject _point1;
14.     [SerializeField] GameObject _point2;
15.     [SerializeField] GameObject _point3;
16.  
17.     [SerializeField]
18.     bool m_RebuildExtrudeOnUpdate = true;
19.  
20.     [SerializeField, Range(0.1f, 10f)] private float _radius = 0.1f;
21.     public float Radius
22.     {
23.         set
24.         {
25.             _splineExtrude.radius = value;
26.             _splineExtrude.Rebuild();
27.         }
28.     }
29.  
30.     BezierKnot[] m_Origins;
31.  
32.     // Start is called before the first frame update
33.     void Start()
34.     {
35.      
36.         // Create Spline using 3 Spheres positions.
37.         _splineContainer = this.GetComponent<SplineContainer>();
38.         _spline = _splineContainer.Spline;
39.         _spline.Clear();
40.         _spline.EditType = SplineType.CatmullRom;
41.         _spline.Add(new BezierKnot(_point1.transform.position));
42.         _spline.Add(new BezierKnot(_point2.transform.position));
43.         _spline.Add(new BezierKnot(_point3.transform.position));
44.         _spline.Closed = false;
45.         _splineContainer.Spline = _spline;
46.  
47.         // Create Extrude Dynamic.
48.         _splineExtrude = this.GetComponent<SplineExtrude>();
49.         _splineExtrude.container = _splineContainer;
50.         _splineExtrude.Rebuild();
51.  
52.         this.GetComponent<MeshRenderer>().enabled = true;
53.         m_Origins = _spline.Knots.ToArray();
54.     }
55.  
56.     // Update is called once per frame
57.     void Update()
58.     {
59.         this.Radius = _radius;
60.  
61.         // Recreate Spline.
62.         if (Input.GetKeyDown(KeyCode.Space))
63.         {
64.             _spline.Clear();
65.             _spline.EditType = SplineType.CatmullRom;
66.             _spline.Add(new BezierKnot(_point1.transform.position));
67.             _spline.Add(new BezierKnot(_point2.transform.position));
68.             _spline.Add(new BezierKnot(_point3.transform.position));
69.             //_spline.Closed = true;
70.             //_splineExtrude.Rebuild();
71.         }
72.  
73.         // Down a point position.
74.         if (Input.GetKeyDown(KeyCode.A))
75.         {
76.             _spline[1] += new Vector3(0f, -1f, 0f);
77.         }
78.     }
79. }

Set EditType to CatmullRom to dynamically create the mesh.
However, the mesh is straight (now.png) .
If I move the Knot a little in the Scene view, I get a smooth mesh (goal.png) .

How can I create a smooth mesh using only a script?
Thanks.