Version: 2019.1
public float shadowBias ;

Description

Apply a shadow bias to prevent self-shadowing artifacts. The specified value is the proportion of the trail width at each segment.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { private TrailRenderer tr;

void Start() { tr = GetComponent<TrailRenderer>(); tr.material = new Material(Shader.Find("Standard")); tr.castShadows = true; tr.receiveShadows = true; tr.shadowBias = 0.3f; } }