Unity中Shader从上向下移动

Shader UI/VisibleBottomToTop { Properties { [PerRendererData] _MainTex (Sprite Texture, 2D) white {} _Visible (可见范围 0~1, Range(0,1)) 1 } SubShader { Tags { QueueTransparent IgnoreProjectorTrue RenderTypeTransparent CanUseSpriteAtlasTrue } LOD 100 ZWrite Off Blend SrcAlpha OneMinusSrcAlpha Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag #include UnityCG.cginc #include UnityUI.cginc struct appdata_t { float4 vertex : POSITION; float2 uv : TEXCOORD0; }; struct v2f { float4 vertex : SV_POSITION; float2 uv : TEXCOORD0; }; sampler2D _MainTex; float4 _MainTex_ST; float _Visible; v2f vert (appdata_t v) { v2f o; o.vertex UnityObjectToClipPos(v.vertex); o.uv TRANSFORM_TEX(v.uv, _MainTex); return o; } fixed4 frag (v2f i) : SV_Target { if (i.uv.y _Visible) { discard; } return tex2D(_MainTex, i.uv); } ENDCG } } }