unity3d 温度云图shader

来源：互联网发布：西安远华软件编辑：程序博客网时间：2024/05/04 01:54

项目中用到关于温度云图效果，但是本人对shader还没入门，在网上找的一个牛人的shader 。起初直接copy下来shader 编译报错，经过排错我把它修改编译通过了（编译版本unity 4.3），并把源码提供出来，希望可以帮助其他需要的人。

Shader "Custom/TemperatureField" {Properties {_MainTex ("Base (RGB)", 2D) = "white" {}_Point1("Temperature1",Range(0,100)) = 50_Point2("Temperature2",Range(0,100)) = 50_Point3("Temperature3",Range(0,100)) = 50_Point4("Temperature4",Range(0,100)) = 50}SubShader {AlphaTest Greater 0.1Pass {  CGPROGRAM#pragma exclude_renderers d3d11 xbox360 gles #pragma target 3.0 #pragma vertex vert #pragma fragment frag #include "UnityCG.cginc" sampler2D _MainTex; float4 _MainTex_ST; float _Point1; float _Point2; float _Point3; float _Point4; bool computer = false; struct v2f { float4 pos:SV_POSITION; float2 uv:TEXCOORD0; }; v2f vert(appdata_base v) { v2f o; o.pos=mul(UNITY_MATRIX_MVP,v.vertex); o.uv = TRANSFORM_TEX(v.texcoord,_MainTex); return o; } float computerTemperature(float2 uv) { int plength = 3; float _midPointX[3] = {0.2,0.8,0.5}; float _midPointY[3] = {0.7,0.9,0.4}; float _midPointT[3] = {10,20,90}; float d1 = sqrt(uv.x*uv.x+uv.y*uv.y); float d2 = sqrt((1-uv.x)*(1-uv.x)+(1-uv.y)*(1-uv.y)); float d3 = sqrt(uv.x*uv.x+(1-uv.y)*(1-uv.y)); float d4 = sqrt((1-uv.x)*(1-uv.x)+uv.y*uv.y); float m = 1/d1+1/d2+1/d3+1/d4; float n = 1/d1*_Point1+1/d2*_Point4+1/d3*_Point3+1/d4*_Point2; for (int i = 0 ; i < plength ; i++) { float dp = sqrt((uv.x-_midPointX[i])*(uv.x-_midPointX[i])+(uv.y-_midPointY[i])*(uv.y-_midPointY[i])); m = m + 1/dp; n = n + 1/dp*_midPointT[i]; } return n/m; } float4 frag(v2f i):COLOR { float4 outp; float4 texCol = tex2D(_MainTex,i.uv); float temp = computerTemperature(i.uv); //float temp = computeArray(i.uv); //图像区域，判定设置为颜色的A > 0.5,输出为材质颜色+光亮值 if(texCol.w>0.5) { if(temp >= 60) outp = float4(1,0,0,1)*(temp-60)/40+float4(1,1,0,1)*(1-(temp-60)/40); else if(temp >= 30) outp = float4(1,1,0,1)*(temp-30)/30+float4(0,1,0,1)*(1-(temp-30)/30); else outp = float4(0,1,0,1)*(temp)/30+float4(0,0,1,1)*(1-(temp)/30); } else outp = float4(0,0,0,0); return outp; }   ENDCG}} FallBack "Diffuse"}

我的项目中利用后的效果如下：

这只是简单利用，其它复杂的效果还有待研究后提供出来；比如温度监控点坐标、监控温度等。

原址：http://game.ceeger.com/forum/read.php?tid=9392&fid=2

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