Cleaned up and commented version.

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders/GazeOverlayPass.hlsl

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+#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+TEXTURE2D_X(_CameraDepthTexture);
+SAMPLER(sampler_CameraDepthTexture);
+
+float3 _GazeOrigin;
+float3 _GazeDirection;
+float _FoveaAngle;
+float _PeriAngle;
+
+float4 _FoveaColor = float4(0,1,0,0.25);
+float4 _periColor = float4(1,0,0,0.18);
+float4 _BlockedCol = float4(0.3,0.3,0.3,0.22);
+
+half4 frag (Varyings input) : SV_Target
+{
+	return float4(1, 0, 1, 0.5);
+	// Nimmt die Depth Texture und rekonstruiert daraus die World Position
+	//float depth = SAMPLE_TEXTURE2D_X(_CameraDepthTexture, sampler_CameraDepthTexture, input.texcoord).r;
+	//float4 clip = float4(input.texcoord * 2 - 1, depth, 1);
+	//float4 view = mul(UNITY_MATRIX_I_P, clip); view /= view.w;
+	//float3 world = mul(UNITY_MATRIX_I_V, view).xyz;
+
+	// Eryeugt einen Vektor vom Origin zum gewünschten Pixel
+	//float3 v = normalize(world - _GazeOrigin);
+	//float cosAng = dot(v, normalize(_GazeOrigin));
+
+	// Berechnung Cosinus
+	//float cosF = cos(_FoveaAngle);
+	//float cosP = cos(_PeriAngle);
+
+	//float4 col;
+	//if (cosAng >= cosF) col = _FoveaColor;
+	//else if (cosAng >= cosP) col = _periColor;
+	//else discard;
+
+	//uint gLayer = 8;
+	//if (unity_RenderingLayer.x & (1u << gLayer))
+		//col = _BlockedCol;
+
+	//return col;
+}