AONonRandom

    float3 position = Position.Sample(deferredSampler, input.uv).rgb;
    float3 normal = Normal.Sample(deferredSampler, input.uv).rgb;

    float depth = distance(position, CameraPosition);

    float noise = 0;// rand_1_05(input.uv);

    float r = AORadius / SampleRadius;
    float occlusion = 0;

    float dAngle = (2 * pi) / SampleDir;

    float angle = (2 * pi) * noise;
    float rayLen = r / depth;


    for (int i = 0; i < SampleDir; i++)
    {
        angle += dAngle;

        float2 ray = float2(cos(angle), sin(angle))*rayLen;

        for (int j = 0; j < SampleRadius; j++)
        {
            float3 sampleOffset = Position.Sample(deferredSampler, input.uv + ray * j).rgb - position; // vector towards sample

            float len = dot(sampleOffset, sampleOffset);
            // dot of the sample vector with the surface normal: how big is the angle.
            // div by len: how far is it? is it still relevant to our sample?
            float sampleAngle = dot(sampleOffset, normal) / len;
            occlusion += saturate(sampleAngle) / SampleDir / SampleRadius;
        }
    }

    float final = pow(1 - occlusion, 4);