LineRenderer.SetPositions

Parameters

Description

Set the positions of all vertices in the line.

This method is preferred to SetPosition when setting all positions, as it is more efficient to set all positions using a single command than to set each position individually. Note that positionCount must be called before SetPositions. Also SetPositions ignores points with indices beyond positionCount.

Additional resources: positionCount property, SetPosition function.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    // Creates a line renderer that follows a Sin() function
    // and animates it.

    public Color c1 = Color.yellow;
    public Color c2 = Color.red;
    public int lengthOfLineRenderer = 20;

    LineRenderer lineRenderer;

    void Start()
    {
        lineRenderer = gameObject.AddComponent<LineRenderer>();
        lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
        lineRenderer.widthMultiplier = 0.2f;
        lineRenderer.positionCount = lengthOfLineRenderer;

        // A simple 2 color gradient with a fixed alpha of 1.0f.
        float alpha = 1.0f;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] { new GradientColorKey(c1, 0.0f), new GradientColorKey(c2, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
        );
        lineRenderer.colorGradient = gradient;
    }

    void Update()
    {
        LineRenderer lineRenderer = GetComponent<LineRenderer>();
        var points = new Vector3[lengthOfLineRenderer];
        var t = Time.time;
        for (int i = 0; i < lengthOfLineRenderer; i++)
        {
            points[i] = new Vector3(i * 0.5f, Mathf.Sin(i + t), 0.0f);
        }
        lineRenderer.SetPositions(points);
    }
}