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unity-shader-dissolve

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CharacterDissolve

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Shader "Custom/CharacterDissolve"
{
    Properties
    {
        [Header(Base)]
        [NoScaleOffset]_MainTex("MainTex",2D) = "white"{}
        _Color ("Color",Color) = (0,0,0,0)

        [Space(10)]
        [Header(Dissolve)]
        _DissolveTex("DissolveTex(R)",2D) = "white"{}
        [NoScaleOffset]_DissolveRampTex("DissolveRampTex(RGB)",2D)= "white"{}
        _DissolveIntensity("DissolveIntensity", Range(0.01, 1)) = 0.1
        _DissolveThreshold("DissolveThreshold",Range(-0.1, 1)) = -0.1
    }

    SubShader
    {
        Tags { "RenderType"="Opaque" }

        pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            fixed4 _Color;
            sampler2D _DissolveTex;float4 _DissolveTex_ST;
            sampler _DissolveRampTex;
            fixed _DissolveIntensity;
            fixed _DissolveThreshold;

            struct appdata
            {
                float4 vertex   :POSITION;
                float4 uv       :TEXCOORD;
            };

            struct v2f
            {
                float4 pos  :SV_POSITION;
                float4 uv   :TEXCOORD;
                float4 worldPos:TEXCOORD1;
            };

            v2f vert(appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv.xy = v.uv.xy;
                o.uv.zw = TRANSFORM_TEX(v.uv, _DissolveTex);
                o.worldPos = mul(unity_ObjectToWorld, v.vertex);

                return o;
            }

            fixed4 frag(v2f i) : SV_TARGET
            {
                fixed4 outColor;
                fixed4 tex = tex2D(_MainTex, i.uv.xy);
                outColor = tex * _Color;

                // 采样消融系数
                fixed4 dissolveTex = tex2D(_DissolveTex, i.uv.zw);
                fixed dissolveFac = dissolveTex.r - _DissolveThreshold;

                // 完全消融就剔除
                clip(dissolveFac);
                
                // 采样消融颜色
                fixed dissolveValue = saturate(dissolveFac / _DissolveIntensity);
                fixed4 rampTex = tex1D(_DissolveRampTex, dissolveValue);
                
                // 消融颜色处理，有消融的时候就用消融，否则用图片颜色
                // 颜色 + 或 *，会导致颜色奇怪，覆盖效果好
                outColor.rgb = lerp(outColor.rgb, rampTex.rgb, step(0.01, rampTex.r));

                return outColor;
            }

            ENDCG
        }
    }

    Fallback "Legacy Shaders/VertexLit"
}

消融效果图