Shader在地上画个圆

圈移动，访问修改shader的属性

using UnityEngine;

[ExecuteInEditMode]
public class Radius : MonoBehaviour {

    public Material radiusMaterial;
    public float radius = 1;
    public Color color = Color.white;

    // Use this for initialization
    void Start () {
	
	}
	
    //每帧更新shader中的参数值
	// Update is called once per frame
	void Update () {
        radiusMaterial.SetVector("_Center", transform.position);
        radiusMaterial.SetFloat("_Radius", radius);
        radiusMaterial.SetColor("_RadiusColor", color);
    }
}

shader其实很简单

Properties {
		_Color("Color", Color) = (1,1,1,1)
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		
		_Center("Center", Vector) =