UnityLineRenderer

UnityLineRenderer（现行渲染器）

画圆

//添加LineRenderer组件  
lineRenderer = obj.AddComponent<LineRenderer>();  
//设置材质  
lineRenderer.material = new Material(Shader.Find("Particles/Additive"));  
//设置颜色  
lineRenderer.SetColors(Color.red, Color.yellow);  
//设置宽度  
lineRenderer.SetWidth(0.02f, 0.02f);  
lineRenderer.useWorldSpace = false;
lineRenderer.SetVertexCount(100);
int count = 100;
int rang = 5;
for (int i=0; i<99; i++) {
            float x = Mathf.Sin ((360f * i / count ) * Mathf.Deg2Rad) * rang;
            float y = Mathf.Cos ((360f * i / count ) * Mathf.Deg2Rad) * rang;

            lineRenderer.SetPosition (i, new Vector3 (x, y, obj.transform.position.z));
        }
        lineRenderer.SetPosition (99, new Vector3 (Mathf.Sin ((360f * 0 / count ) * Mathf.Deg2Rad) * rang, Mathf.Cos ((360f * 0 / count ) * Mathf.Deg2Rad) * rang, obj.transform.position.z));      

画线

Vector3 vec = this.transform.forward*rang;
lineRenderer.SetPosition(0, vec);//方向*距离