项目中需要加入一个水面倒影的效果,而我现在这个项目是2D的,2D的话倒影比3D要好做的多,只要用grabpass抓取屏幕,uv取反,加上一个偏移值,最后用一个三角函数对uv坐标进行偏移就好了
效果如下
(gif有点糊)
参数面板
完整代码
Shader "LX/postDistortion"
{
Properties
{
_Color ("Color", Color) = (1,1,1,1)
_DistortionScale ("DistortionScale", float) = 0.1
_WaveLength ("WaveLength", float) = 1
_Offset ("Offset", float) = 0
}
SubShader
{
Tags
{
"Queue"="Transparent"
"RenderType"="Opaque"
}
LOD 200
GrabPass
{
"_GrabTex"
}
CGPROGRAM
#pragma surface surf Standard fullforwardshadows
#pragma target 3.0
sampler2D _GrabTex;
float4 _GrabTex_TexelSize;
float _DistortionScale;
float _WaveLength;
float _Offset;
struct Input
{
float4 screenPos;
};
fixed4 _Color;
void surf(Input IN, inout SurfaceOutputStandard o)
{
IN.screenPos.xy /= IN.screenPos.w;
IN.screenPos.y = -IN.screenPos.y + _Offset;
IN.screenPos.x += _DistortionScale * sin(_Time.y + IN.screenPos.y * _WaveLength)*0.01;
fixed4 c = tex2D(_GrabTex, IN.screenPos) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
另外代码也传到github仓库里了,大家也可以关注一下哦~
我的github