TrailRenderer.colorGradient

Description

Set the color gradient describing the color of the trail at various points along its length.

Additional resources: Gradient.

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(TrailRenderer))]
public class ExampleClass : MonoBehaviour
{
    private TrailRenderer tr;

    void Start()
    {
        tr = GetComponent<TrailRenderer>();
        tr.material = new Material(Shader.Find("Sprites/Default"));

        // 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(Color.green, 0.0f), new GradientColorKey(Color.red, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
        );
        tr.colorGradient = gradient;
    }

    void Update()
    {
        tr.transform.position = new Vector3(Mathf.Sin(Time.time * 1.51f) * 7.0f, Mathf.Cos(Time.time * 1.27f) * 4.0f, 0.0f);
    }
}