Untiy Shader实现纹理贴图滚动

滚动纹理，可以实现一些如瀑布，河流，熔岩流等效果，本质上就是uv坐标的偏移，在unity中新建一个shader,然后修改成下面代码的样子，新建一个材质，选择此shader,赋予一张贴图，然后将材质应用于一个mesh上，运行即可看到效果

shader "custom/uvoffset" {
 properties {
  _maintint("diffuse tine",color) = (1,1,1,1)
  _maintex("base (rgb)",2d) = "white"{}
  _scrollxspeed("x scroll speed",range(0,10)) = 0
  _scrollyspeed("y scroll speed",range(0,10)) = 2
 }
 subshader {
  tags { "rendertype"="opaque" }
  lod 200

  cgprogram
  // physically based standard lighting model, and enable shadows on all light types
  #pragma surface surf standard fullforwardshadows

  // use shader model 3.0 target, to get nicer looking lighting
  #pragma target 3.0

  // 定义 properties 中的属性
  fixed4 _maintint;
  fixed _scrollxspeed;
  fixed _scrollyspeed;
  sampler2d _maintex;

  struct input {
   float2 uv_maintex;
  };

  void surf (input in, inout surfaceoutputstandard o) {
   fixed2 scrolleduv = in.uv_maintex;
   fixed xscrollvalue = _scrollxspeed * _time;
   fixed yscrollvalue = _scrollyspeed * _time;
   scrolleduv += fixed2(xscrollvalue,yscrollvalue);

   // 对贴图进行采样输出
   half4 c = tex2d(_maintex,scrolleduv);
   o.albedo = c.rgb * _maintint;
   o.alpha = c.a;
  }
  endcg
 } 
 fallback "diffuse"
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。