本文实例为大家分享了Unity shader百叶窗展示的具体代码，供大家参考，具体内容如下
1.将图片划分为水平N栏，代码如下：
Shader "Unlit/BYCShader"{ Properties { [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {} _Color ("Tint", Color) = (1,1,1,1) _StencilComp ("Stencil Comparison", Float) = 8 _Stencil ("Stencil ID", Float) = 0 _StencilOp ("Stencil Operation", Float) = 0 _StencilWriteMask ("Stencil Write Mask", Float) = 255 _StencilReadMask ("Stencil Read Mask", Float) = 255 _ColorMask ("Color Mask", Float) = 15 _Lan("Lan",Float) = 10 [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0 } SubShader { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" "CanUseSpriteAtlas"="True" } Stencil { Ref [_Stencil] Comp [_StencilComp] Pass [_StencilOp] ReadMask [_StencilReadMask] WriteMask [_StencilWriteMask] } Cull Off Lighting Off ZWrite Off ZTest [unity_GUIZTestMode] Blend SrcAlpha OneMinusSrcAlpha ColorMask [_ColorMask] Pass { Name "Default" CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma target 2.0 #include "UnityCG.cginc" #include "UnityUI.cginc" #pragma multi_compile __ UNITY_UI_CLIP_RECT #pragma multi_compile __ UNITY_UI_ALPHACLIP struct appdata_t { float4 vertex : POSITION; float4 color : COLOR; float2 texcoord : TEXCOORD0; UNITY_VERTEX_INPUT_INSTANCE_ID }; struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 worldPosition : TEXCOORD1; UNITY_VERTEX_OUTPUT_STEREO }; v2f vert(appdata_t v) { v2f OUT; UNITY_SETUP_INSTANCE_ID(v); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT); OUT.worldPosition = v.vertex; OUT.vertex = UnityObjectToClipPos(OUT.worldPosition); OUT.texcoord = v.texcoord; OUT.color = v.color; return OUT; } sampler2D _MainTex; float _Lan; float4 frag(v2f IN) : SV_Target { //從這裡開始 float2 uv = IN.texcoord; uv.x*= _Lan; uv.x = frac(uv.x); return float4(uv.xy,1.0,1.0); } ENDCG } }}
如上图，划分为N栏后，对每一栏进行单独处理，即可做到每一栏都同时进行颜色消减。
2.对每一栏同时进行颜色消减（控制阈值可以通过c#代码实现）
代码如下：
Shader "Unlit/BYCShader"{ Properties { [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {} _Color ("Tint", Color) = (1,1,1,1) _StencilComp ("Stencil Comparison", Float) = 8 _Stencil ("Stencil ID", Float) = 0 _StencilOp ("Stencil Operation", Float) = 0 _StencilWriteMask ("Stencil Write Mask", Float) = 255 _StencilReadMask ("Stencil Read Mask", Float) = 255 _ColorMask ("Color Mask", Float) = 15 _Lan("Lan",Float) = 10 _StepX("StepX",Range(0.0,1.0))=1.0 [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0 } SubShader { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" "CanUseSpriteAtlas"="True" } Stencil { Ref [_Stencil] Comp [_StencilComp] Pass [_StencilOp] ReadMask [_StencilReadMask] WriteMask [_StencilWriteMask] } Cull Off Lighting Off ZWrite Off ZTest [unity_GUIZTestMode] Blend SrcAlpha OneMinusSrcAlpha ColorMask [_ColorMask] Pass { Name "Default" CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma target 2.0 #include "UnityCG.cginc" #include "UnityUI.cginc" #pragma multi_compile __ UNITY_UI_CLIP_RECT #pragma multi_compile __ UNITY_UI_ALPHACLIP struct appdata_t { float4 vertex : POSITION; float4 color : COLOR; float2 texcoord : TEXCOORD0; UNITY_VERTEX_INPUT_INSTANCE_ID }; struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 worldPosition : TEXCOORD1; UNITY_VERTEX_OUTPUT_STEREO }; v2f vert(appdata_t v) { v2f OUT; UNITY_SETUP_INSTANCE_ID(v); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT); OUT.worldPosition = v.vertex; OUT.vertex = UnityObjectToClipPos(OUT.worldPosition); OUT.texcoord = v.texcoord; OUT.color = v.color; return OUT; } sampler2D _MainTex; float _Lan; float _StepX; float4 frag(v2f IN) : SV_Target { float2 uv = IN.texcoord; uv.x*= _Lan; uv.x = frac(uv.x); //從這裡開始,顏色值大於指定值stepx的進行消減 int needDiscard = step(_StepX,uv.x); if(needDiscard == 1){ discard; } return float4(uv.xy,1.0,1.0); } ENDCG } }}
效果如下：
3.加上切变，百叶窗在关闭打开时，是有透视变化的。用切变可以近似模拟透视，因为透视的实现代价很大，所以用切变。
添加一张图片，并进行切变
代码如下：
Shader "Unlit/BYCShader"{ Properties { [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {} _Color ("Tint", Color) = (1,1,1,1) _StencilComp ("Stencil Comparison", Float) = 8 _Stencil ("Stencil ID", Float) = 0 _StencilOp ("Stencil Operation", Float) = 0 _StencilWriteMask ("Stencil Write Mask", Float) = 255 _StencilReadMask ("Stencil Read Mask", Float) = 255 _ColorMask ("Color Mask", Float) = 15 _Lan("Lan",Float) = 10 _StepX("StepX",Range(0.0,1.0))=1.0 [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0 } SubShader { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" "CanUseSpriteAtlas"="True" } Stencil { Ref [_Stencil] Comp [_StencilComp] Pass [_StencilOp] ReadMask [_StencilReadMask] WriteMask [_StencilWriteMask] } Cull Off Lighting Off ZWrite Off ZTest [unity_GUIZTestMode] Blend SrcAlpha OneMinusSrcAlpha ColorMask [_ColorMask] Pass { Name "Default" CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma target 2.0 #include "UnityCG.cginc" #include "UnityUI.cginc" #pragma multi_compile __ UNITY_UI_CLIP_RECT #pragma multi_compile __ UNITY_UI_ALPHACLIP struct appdata_t { float4 vertex : POSITION; float4 color : COLOR; float2 texcoord : TEXCOORD0; UNITY_VERTEX_INPUT_INSTANCE_ID }; struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 worldPosition : TEXCOORD1; UNITY_VERTEX_OUTPUT_STEREO }; v2f vert(appdata_t v) { v2f OUT; UNITY_SETUP_INSTANCE_ID(v); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT); OUT.worldPosition = v.vertex; OUT.vertex = UnityObjectToClipPos(OUT.worldPosition); OUT.texcoord = v.texcoord; OUT.color = v.color; return OUT; } sampler2D _MainTex; float _Lan; float _StepX; float4 frag(v2f IN) : SV_Target { //這裡進行裁剪 float2 uv = IN.texcoord; uv.x*= _Lan; uv.x = frac(uv.x); int needDiscard = step(_StepX,uv.x); if(needDiscard == 1){ discard; } //这里进行切变 float x1 = uv.x; uv = IN.texcoord; uv+=float2(-0.5,-0.5); uv.x-=x1;//切變時，先將重心調整到中心，然后绕每一栏的起点进行切变（这里类似于绕某一点旋转，所以后面要进行反向操作，加了就减，减了就加） float2x2 qiebian = float2x2(1,0,(1.0-_StepX),1); uv = mul(qiebian,uv); uv-=float2(-0.5,-0.5); uv.x+=x1; float4 color= tex2D(_MainTex, uv); return color; } ENDCG } }}
效果如下：
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本文标题: Unity shader实现百叶窗特效
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