84 lines
2.7 KiB
GLSL
84 lines
2.7 KiB
GLSL
Shader "Unlit/MetallBallHeatMapShader"
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{
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Properties
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{
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_HeatMapTex("Texture",2D) = "white"{}
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_Alpha("Alpha",range(0,1)) = 0.8
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}
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SubShader
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{
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Tags {"RenderType" = "Overlay" "Queue" = "Transparent" }
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Blend SrcAlpha OneMinusSrcAlpha
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ZTest[unity_GUIZTestMode]
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ZWrite On
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LOD 100
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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sampler2D _HeatMapTex;
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half _Alpha;
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uniform int _FactorCount = 0;
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uniform float3 _Factors[100];//控制点的数量不够的话可以重新指定数组长度，但是数量越多效率越低
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uniform float3 _FactorsProperties[100];
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struct appdata
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{
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float4 vertex : POSITION;
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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float3 worldVertex : TEXCOORD1;
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};
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//hsv颜色转rgb颜色
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float3 hsv2rgb(float3 c)
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{
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c = float3(c.x, clamp(c.yz, 0.0, 1.0));
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float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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float3 p = abs(frac(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * lerp(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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v2f vert (appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.worldVertex = mul(unity_ObjectToWorld, v.vertex).xyz;
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return o;
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}
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fixed4 frag(v2f input) : SV_Target
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{
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half heat = 0;
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//逐像素遍历各个控制点效率低
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for (int i = 0; i < _FactorCount; i++)
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{
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float len = length(input.worldVertex.xyz - _Factors[i].xyz);
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float value;
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if (len < _FactorsProperties[i].x)//在半径之内的统一为红色
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value = 1;
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else
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value = _FactorsProperties[i].y / (len - _FactorsProperties[i].x);//范围之外递减
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heat += value;
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heat = clamp(heat, 0, 0.95);
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}
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heat = clamp(heat, 0.3, 1);
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fixed4 col = float4(hsv2rgb(float3(heat, 1, 1)), 1);
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//颜色不再使用贴图采样获取
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//fixed4 col = tex2D(_HeatMapTex, fixed2(heat, 0.5));
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col.a = _Alpha;
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return col;
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}
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ENDCG
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}
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}
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FallBack "Diffuse"
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}
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