public static (HitResult hit, double refractiveIndexEntering, double refractiveIndexExiting) prepareComputations(Ray r, Intersection i, Intersection[] ixs)
{
var h = i.figure
.AllHits(r.origin, r.dir)
.First(hit => Core.Constants.EpsilonCompare(hit.Distance, i.t));
if (ixs == null)
{
return(h, 1.0, 1.0);
}
var all = ixs.Select(x => x.figure
.AllHits(r.origin, r.dir)
.First(hit => Core.Constants.EpsilonCompare(hit.Distance, x.t)))
.ToArray();
var(refractiveIndexEntering, refractiveIndexExiting) = Refraction.computeRefractiveIndexes(h.Distance, all);
return(h, refractiveIndexEntering, refractiveIndexExiting);
}
