Unity将4个纹理图拼接成1个纹理

需要的效果

最终实现的效果大概如下:

4个贴图上去

这里随便放一个切分的图。

Shader代码如下

直接上代码:

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt) // Unlit shader. Simplest possible textured shader. // - no lighting // - no lightmap support // - no per-material color Shader "Unlit/TextureMy" { Properties { _MainTex ("Base (RGB)", 2D) = "white" {} _MainTex0 ("Base0 (RGB)", 2D) = "white" {} _MainTex1 ("Base1 (RGB)", 2D) = "white" {} _MainTex2 ("Base2 (RGB)", 2D) = "white" {} _MainTex3 ("Base3 (RGB)", 2D) = "white" {} } SubShader { Tags { "RenderType"="Opaque" } LOD 100 Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma target 2.0 #pragma multi_compile_fog #include "UnityCG.cginc" struct appdata_t { float4 vertex : POSITION; float2 texcoord : TEXCOORD0; UNITY_VERTEX_INPUT_INSTANCE_ID }; struct v2f { float4 vertex : SV_POSITION; float2 texcoord : TEXCOORD0; UNITY_FOG_COORDS(1) UNITY_VERTEX_OUTPUT_STEREO }; sampler2D _MainTex; float4 _MainTex_ST; sampler2D _MainTex0; sampler2D _MainTex1; sampler2D _MainTex2; sampler2D _MainTex3; v2f vert (appdata_t v) { v2f o; UNITY_SETUP_INSTANCE_ID(v); UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o); o.vertex = UnityObjectToClipPos(v.vertex); o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex); UNITY_TRANSFER_FOG(o,o.vertex); return o; } fixed4 frag (v2f i) : SV_Target { fixed4 col; float2 uv = i.texcoord; float2 uvFix = uv; if (uv.x < 0.5) { if(uv.y < 0.5) { uvFix.x = uv.x * 2; uvFix.y = uv.y * 2; col = tex2D (_MainTex2 , uvFix ); } else { uvFix.x = uv.x * 2; uvFix.y = uv.y * 2 - 1; col = tex2D (_MainTex0 , uvFix ); } } else { if(uv.y < 0.5) { uvFix.x = uv.x * 2 - 1; uvFix.y = uv.y * 2 ; col = tex2D (_MainTex3 , uvFix ); } else { uvFix.x = uv.x * 2 - 1; uvFix.y = uv.y * 2 - 1; col = tex2D (_MainTex1 , uvFix ); } } //fixed4 col = tex2D(_MainTex, i.texcoord); UNITY_APPLY_FOG(i.fogCoord, col); UNITY_OPAQUE_ALPHA(col.a); return col; } ENDCG } } }

uv左下角是0,0,所以第一个if判定再左下角,使用_MainTex2 纹理,那么如果铺满屏幕问题,需要*2. 其他部分的类似。

按照这个思路可以扩充8*8等其他。

特别注意

这里要注意，需要把图的WrapMode改为Clamp，repeat会有接缝。