shader溶解特效

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前言:在游戏中间我们常常看见物体会慢慢消融,变为灰烬,这个效果可以用于人物的消失,毁灭.

代码:

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)    }    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;                        float4 frag(v2f_img i):COLOR            {                float DissolveFactor = saturate(_Time.y / _DissolveSpeed);                float noiseValue = tex2D(_NoiseTex,i.uv).r;                            if(noiseValue <= DissolveFactor)                {                    discard;                }                                float4 texColor = tex2D(_MainTex,i.uv);//noiseValue - DissolveFactor，这个值表示溶解贴图上的R通道值和目前的溶解基准值相差多少//EdgeFactor越小表示离溶解时间越近,也就是说它边缘化的颜色成分越重                float EdgeFactor = saturate((noiseValue - DissolveFactor)/(_EdgeWidth*DissolveFactor));                float4 BlendColor = texColor * _EdgeColor;                                                return lerp(texColor,BlendColor,1 - EdgeFactor);            }                        ENDCG        }    }         FallBack Off}

重点是这几行代码,设定DissolveFactor为阀值,如果小于阈值，就抛弃该片断

if(noiseValue <= DissolveFactor)
{
discard;

}

这几句代码是为了边缘颜色形成类似火燃烧的颜色.

float4 texColor = tex2D(_MainTex,i.uv);
//noiseValue - DissolveFactor，这个值表示溶解贴图上的R通道值和目前的溶解基准值相差多少
//EdgeFactor越小表示离溶解时间越近,也就是说它边缘化的颜色成分越重
float EdgeFactor = saturate((noiseValue - DissolveFactor)/(_EdgeWidth*DissolveFactor));
float4 BlendColor = texColor * _EdgeColor;

同时传一下noise图片

参考:参考链接：http://www.cnblogs.com/Esfog/p/DissolveShader.html

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