/// <summary>This method performs the calculations. The <b>eye</b> and <b>tgt</b> arguments store the position in .xyz, and the radius in .w, both in world space.</summary>
public static float Calculate(int layers, Vector4 eye, Vector4 tgt)
{
var occlusion = 0.0f;
CalculateRaycast(layers, eye, tgt, ref occlusion);
if (occlusion < 1.0f)
{
SgtHelper.InvokeCalculateOcclusion(layers, eye, tgt, ref occlusion);
}
return(Mathf.Clamp01(occlusion));
}