在Unity Shader中自定義材質面板

很多時候，我們為了使寫出來的shader更加直觀易用，需要對材質面板的顯示樣式做一些簡單的修改。雖然Unity提供了Custom Shader GUI的方法，但是對於我們只想單純地寫一個shader來說，還要再去改GUI未免太過麻煩。所以我們還是決定直接在shader代碼裡對材質面板進行設定。

Shader "Custom/Custom Material Inspector"{  Properties  {        [Header(Custom Material Inspector)]
        [Space]
    _MainTex ("Main Tex", 2D) = "white" {}
        [NoScaleOffset]_SecondTex ("Second Tex", 2D) = "white" {}
        [Space(50)]
                [Toggle] _Invert ("Invert color?", Float) = 0
        [Toggle(ENABLE_FANCY)] _Fancy ("Fancy?", Float) = 0
            [Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend ("Src Blend Mode", Float) = 1    [Enum(UnityEngine.Rendering.BlendMode)] _DstBlend ("Dst Blend Mode", Float) = 1    [Enum(UnityEngine.Rendering.CullMode)] _Cull ("Cull Mode", Float) = 1    [Enum(UnityEngine.Rendering.CompareFunction)] _ZTest ("ZTest", Float) = 0
            [Enum(Off, 0, On, 1)] _ZWrite ("ZWrite", Float) = 0                    [KeywordEnum(None, Add, Multiply)] _Overlay ("Overlay mode", Float) = 0
            [PowerSlider(3.0)] _Brightness ("Brightness", Range (0.01, 1)) = 0.1  }  SubShader  {    Tags { "Queue"="Transparent" "RenderType"="Transparent" }    Blend [_SrcBlend] [_DstBlend]    Cull [_Cull]    ZTest [_ZTest]    ZWrite [_ZWrite]
    Pass    {      CGPROGRAM
            #pragma shader_feature _INVERT_ON
            #pragma shader_feature ENABLE_FANCY
                  #pragma multi_compile _OVERLAY_NONE _OVERLAY_ADD _OVERLAY_MULTIPLY
      #pragma vertex vert      #pragma fragment frag      #include "UnityCG.cginc"
      sampler2D _MainTex;      float4 _MainTex_ST;      sampler2D _SecondTex;      float4 _SecondTex_ST;      float _Brightness;
      struct v2f      {        float4 uv : TEXCOORD0;        float4 vertex : SV_POSITION;      };
      v2f vert (appdata_base v)      {        v2f o;        o.vertex = UnityObjectToClipPos(v.vertex);        o.uv.xy = TRANSFORM_TEX(v.texcoord, _MainTex);        o.uv.zw = TRANSFORM_TEX(v.texcoord, _SecondTex);        return o;      }
      fixed4 frag (v2f i) : SV_Target      {        fixed4 col = tex2D(_MainTex, i.uv.xy);
                #if _INVERT_ON        col = 1 - col;        #endif
        #if ENABLE_FANCY        col.r = 0.5;        #endif
        fixed4 secCol = tex2D(_SecondTex, i.uv.zw);
        #if _OVERLAY_ADD        col += secCol;        #elif _OVERLAY_MULTIPLY        col *= secCol;        #endif
        col *= _Brightness;
        return col;      }      ENDCG    }  }}
注意：以上shader僅僅只是為了方面演示，從而把所有情況進行了匯總。從渲染效果的角度來說並不是一個正常的shader。




如果有興趣，也可以詳細閱讀Unity的官方文檔：
https://docs.unity3d.com/2019.3/Documentation/ScriptReference/MaterialPropertyDrawer.html

聲明：發布此文是出於傳遞更多知識以供交流學習之目的。若有來源標註錯誤或侵犯了您的合法權益，請作者持權屬證明與我們聯繫，我們將及時更正、刪除，謝謝。
作者：Faith Tong
原文：https://zhuanlan.zhihu.com/p/78589597
More：【微信公眾號】 u3dnotes