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using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class BezierCurveScript : MonoBehaviour {
public class BezierPath
{
public List<Vector3> pathPoints;
private int segments;
public int pointCount;
public BezierPath()
{
pathPoints = new List<Vector3>();
pointCount = 100;
}
public void DeletePath()
{
pathPoints.Clear ();
}
Vector3 BezierPathCalculation(Vector3 p0, Vector3 p1, Vector3 p2, Vector3 p3, float t)
{
float tt = t * t;
float ttt = t * tt;
float u = 1.0f - t;
float uu = u * u;
float uuu = u * uu;
Vector3 B = new Vector3();
B = uuu * p0;
B += 3.0f * uu * t * p1;
B += 3.0f * u * tt * p2;
B += ttt * p3;
return B;
}
public void CreateCurve(List<Vector3> controlPoints)
{
segments = controlPoints.Count / 3;
for (int s = 0; s < controlPoints.Count -3; s+=3)
{
Vector3 p0 = controlPoints[s];
Vector3 p1 = controlPoints[s+1];
Vector3 p2 = controlPoints[s+2];
Vector3 p3 = controlPoints[s+3];
if(s == 0)
{
pathPoints.Add(BezierPathCalculation(p0, p1, p2, p3, 0.0f));
}
for (int p = 0; p < (pointCount/segments); p++)
{
float t = (1.0f / (pointCount/segments)) * p;
Vector3 point = new Vector3 ();
point = BezierPathCalculation (p0, p1, p2, p3, t);
pathPoints.Add (point);
}
}
}
}
private void createLine(Vector3 start, Vector3 end, float lineSize, Color c)
{
GameObject canvas = new GameObject("canvas" + canvasIndex);
canvas.transform.parent = transform;
canvas.transform.rotation = transform.rotation;
LineRenderer lines = (LineRenderer) canvas.AddComponent<LineRenderer>();
lines.material = new Material(shader);
lines.material.color = c;
lines.useWorldSpace = false;
lines.SetWidth(lineSize, lineSize);
lines.SetVertexCount(2);
lines.SetPosition(0, start);
lines.SetPosition(1, end);
canvasIndex++;
}
private void UpdatePath()
{
List<Vector3> c = new List<Vector3>();
for(int o = 0; o < objects.Length; o++)
{
if(objects[o] != null)
{
Vector3 p = objects[o].transform.position;
c.Add (p);
}
}
path.DeletePath ();
path.CreateCurve(c);
}
private int canvasIndex = 0;
public Shader shader;
BezierPath path = new BezierPath();
public GameObject[] objects;
// Use this for initialization
void Start () {
UpdatePath ();
}
// Update is called once per frame
void Update ()
{
UpdatePath ();
for (int i = 1; i < (path.pointCount); i++)
{
Vector3 startv = path.pathPoints[i-1];
Vector3 endv = path.pathPoints[i];
createLine (startv, endv, 0.25f, Color.blue);
}
}
void OnDrawGizmos()
{
UpdatePath ();
for (int i = 1; i < (path.pointCount); i++)
{
Vector3 startv = path.pathPoints[i-1];
Vector3 endv = path.pathPoints[i];
Gizmos.color = Color.blue;
Gizmos.DrawLine(startv, endv);
}
}
}
@TheTiki

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TheTiki commented Oct 8, 2015

Compact and readable, of all the scripts I've looked through for unity bezier's this one is my favorite.

@mycodingdad

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mycodingdad commented Nov 4, 2019

Thank you, afaq125 🙏 This code is really good!

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