90 lines
2.6 KiB
Plaintext
90 lines
2.6 KiB
Plaintext
Shader "Unlit/CollimatorURP"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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_Color ("Color", Color) = (1, 1, 1, 1)
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_Distance ("Distance", Float) = 100
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_Scale ("Scale", Float) = 1
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}
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SubShader
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{
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Tags { "RenderType"="Trasparent" "Queue"="Transparent" }
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LOD 100
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Pass
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{
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ZTest Off
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Blend SrcAlpha OneMinusSrcAlpha
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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// make fog work
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#pragma multi_compile_fog
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float2 uv : TEXCOORD0;
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UNITY_FOG_COORDS(1)
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float4 vertex : SV_POSITION;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float4 _Color;
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float _Distance;
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float _Scale;
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v2f vert (appdata v)
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{
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v2f o;
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float3 lens_origin = UnityObjectToViewPos(float3(0,0,0));
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float3 p0 = UnityObjectToViewPos(float3(0,0, _Distance));
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float3 n = UnityObjectToViewPos(float3(0,0,1)) - lens_origin;
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float3 uDir = UnityObjectToViewPos(float3(1,0,0)) - lens_origin;
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float3 vDir = UnityObjectToViewPos(float3(0,1,0)) - lens_origin;
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float3 vert = UnityObjectToViewPos(v.vertex);
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float a = dot(p0, n) / dot(vert, n);
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float3 vert_prime = a * vert;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = float2(dot(vert_prime - p0, uDir), dot(vert_prime - p0, vDir));
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o.uv /= (_Scale * _Distance);
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o.uv += float2(0.5, 0.5);
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UNITY_TRANSFER_FOG(o,o.vertex);
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return o;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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// sample the texture
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fixed4 tex = tex2D(_MainTex, i.uv);
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fixed4 col = _Color;
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col.a = tex.a;
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if (i.uv.x < 0 || i.uv.x > 1 || i.uv.y < 0|| i.uv.y > 1)
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{
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col.a = 0;
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}
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// apply fog
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UNITY_APPLY_FOG(i.fogCoord, col);
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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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}
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