通过公式改变材质Color属性，实现黑白图片效果。 Shader "Unlit/NewUnlitShader" { Properties { _MainTex ("Texture", 2D) = "white" {} _GrayImage ("ChangeGray",float) = 1 } SubShader { Tags { "RenderType"="Opaque" } LOD 100 Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag #include "UnityCG.cginc" struct appdata { float4 vertex : POSITION; half4 color : COLOR; float2 texcoord : TEXCOORD0; }; struct v2f { float2 texcoord : TEXCOORD0; half4 color : COLOR; float4 vertex : SV_POSITION; }; sampler2D _MainTex; float _GrayImage; float4 _MainTex_ST; v2f vert (appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.color = v.color; o.texcoord = v.texcoord; return o; } fixed4 frag (v2f i) : COLOR { fixed4 col; if (_GrayImage == 1) { col = tex2D(_MainTex, i.texcoord); float grey = dot(col.rgb, float3(0.299, 0.587, 0.114)); col.rgb = float3(grey, grey, grey); } else { col = tex2D(_MainTex, i.texcoord) * i.color; } return col; } ENDCG } } }