Unity3D LinerRender

 1 LineRenderer lineRender = this.renderer as LineRenderer;
 2 //0表明起始点，这里是设置起始点position
 3 lineRender.SetPosition (0,transform.position);
 4 
 5 Ray ray = new Ray (transform.position,transform.forward);
 6 RaycastHit hitInfo;
 7 if(Physics.Raycast (ray, out hitInfo))
 8 {
 9 //1表明终点，这里设置终点位置
10     lineRender.SetPosition(1,hitInfo.point);
11 }
12 else
13 {
14     lineRender.SetPosition(1,transform.position + transform.forward * 100);
15 }