[UnityShader]溶解与重现效果

参考链接：

效果图：

从颜色变化来说，有三种，一种是纹理颜色，一种是纹理与黑边的混合颜色，一种是透明(用discard处理，，不绘制像素)。还需要一张纹理(任意)，根据它的任意一个通道来控制哪部分先消失。例如上面的效果图用的就是这张纹理的r通道：

如果用的是这张纹理(也就是模型自身的纹理)的r通道，会更加酷：

溶解效果代码如下：

Shader "Esfog/Dissolve" {Properties{_MainTex ("Base (RGB)", 2D) = "white" {}_NoiseTex ("NoiseTex (R)",2D) = "white"{}_DissolveSpeed ("DissolveSpeed (Second)",Float) = 1_EdgeWidth("EdgeWidth",Range(0,0.5)) = 0.1_EdgeColor("EdgeColor",Color) = (1,1,1,1)_StartTime("StartTime",Float) = 0}SubShader{Tags { "RenderType"="Opaque" }Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag#include "UnityCG.cginc"uniform sampler2D _MainTex;uniform sampler2D _NoiseTex;uniform float _DissolveSpeed;uniform float _EdgeWidth;uniform float4 _EdgeColor;uniform float _StartTime;float4 frag(v2f_img i):COLOR{float DissolveFactor = saturate((_Time.y – _StartTime) / _DissolveSpeed);float noiseValue = tex2D(_NoiseTex,i.uv).r;if(noiseValue <= DissolveFactor){discard;}float4 texColor = tex2D(_MainTex,i.uv);float EdgeFactor = saturate((noiseValue – DissolveFactor)/(_EdgeWidth*DissolveFactor));float4 BlendColor = texColor * _EdgeColor;return lerp(texColor,BlendColor,1 – EdgeFactor);}ENDCG}}FallBack Off}重现效果代码如下：

Shader "lyh/Show" {Properties{_MainTex ("Base (RGB)", 2D) = "white" {}_NoiseTex ("NoiseTex (R)",2D) = "white"{}_DissolveSpeed ("DissolveSpeed (Second)",Float) = 1_EdgeWidth("EdgeWidth",Range(0,0.5)) = 0.1_EdgeColor("EdgeColor",Color) = (1,1,1,1)_StartTime("StartTime",Float) = 0}SubShader{Tags { "RenderType"="Opaque" }Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag#include "UnityCG.cginc"uniform sampler2D _MainTex;uniform sampler2D _NoiseTex;uniform float _DissolveSpeed;uniform float _EdgeWidth;uniform float4 _EdgeColor;uniform float _StartTime;float4 frag(v2f_img i):COLOR{float DissolveFactor = saturate((_Time.y – _StartTime) / _DissolveSpeed);float noiseValue = tex2D(_NoiseTex,i.uv).r;float4 texColor = tex2D(_MainTex,i.uv);float EdgeFactor = saturate((noiseValue – DissolveFactor)/(_EdgeWidth*DissolveFactor));float4 BlendColor = texColor * _EdgeColor;clip(1 – EdgeFactor – 0.01);return lerp(BlendColor,texColor,1 – EdgeFactor);}ENDCG}}FallBack Off}在给出的参考链接中，可以很好地了解到原理，这里就不解释了，而重现效果不过就是溶解效果的反转了。这里需要控制一下时间：

material.SetFloat("_StartTime", Time.realtimeSinceStartup);

人生并不在于获取，更在于放得下。放下一粒种子，收获一棵大树；