UnityShader实现百叶窗效果

Shader "Unlit/NewUnlitShader"{ Properties { _MainTex ("Texture", 2D) = "white" {} _MainTex2 ("Texture2", 2D) = "white" {} _StartFlag("开始标记", float) = 0 _SpeedFactor("速度",Range(0.01,10)) = 0.1 _StartTime("时间初始标记，不要手动设置",float) = 1 _Column("百叶窗的列数",float ) = 5 } SubShader { Tags { "RenderType"="Opaque" } LOD 100  Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag // make fog work #pragma multi_compile_fog  #include "UnityCG.cginc"  struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };  struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; };  sampler2D _MainTex; float4 _MainTex_ST;  sampler2D _MainTex2; float4 _MainTex2_ST;  float _StartFlag; float _Column; float _SpeedFactor; float _StartTime;  v2f vert (appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); return o; }  fixed4 frag (v2f i) : SV_Target { fixed4 col = 0; //_StartFlag 通过C#监听键盘事件，设置为1，作为开始动画的标记 //step(a,b) => if(b>=a) return 1 else return 0 //i.uv.x % (1/_Column) i.uv.x范围是0-1,分成_Column份 每份（1/_Column） fixed result = _StartFlag * step( i.uv.x % (1/_Column) ,(_Time.y - _StartTime) * _SpeedFactor );  if( result == 0 ) { col = tex2D(_MainTex, i.uv); } else { col = tex2D(_MainTex2, i.uv); }  return col; } ENDCG } }}

using System.Collections;using System.Collections.Generic;using UnityEngine; public class baiyechuang : MonoBehaviour {  // Use this for initialization Material mat; MeshRenderer meshRen; void Start () { meshRen = this.GetComponent<MeshRenderer> (); print (meshRen); mat = meshRen.material; print (mat); }  void OnGUI() { if (Input.anyKeyDown) {  Event e = Event.current;  if (e.isMouse) {  Debug.Log(e.button);  }  if (e.isKey)  {  if (e.keyCode == KeyCode.None)   return;  Debug.Log(e.keyCode); mat.SetFloat ("_StartTime", Time.timeSinceLevelLoad); mat.SetFloat ("_StartFlag", 1);  } } }  }