private Intersections MinIntersections(RayPacket256 rayPacket256, Scene scene)
{
Intersections mins = new Intersections(Intersections.NullDistance, Intersections.NullIndex);
for (int i = 0; i < scene.Things.Length; i++)
{
Vector256 <float> distance = scene.Things[i].Intersect(rayPacket256);
if (!Intersections.AllNullIntersections(distance))
{
var notNullMask = Compare(distance, Intersections.NullDistance, FloatComparisonMode.NotEqualOrderedNonSignaling);
var nullMinMask = Compare(mins.Distances, Intersections.NullDistance, FloatComparisonMode.EqualOrderedNonSignaling);
var lessMinMask = Compare(mins.Distances, distance, FloatComparisonMode.GreaterThanOrderedNonSignaling);
var minMask = And(notNullMask, Or(nullMinMask, lessMinMask));
var minDis = BlendVariable(mins.Distances, distance, minMask);
var minIndices = BlendVariable(mins.ThingIndices,
Vector256.Create(i),
minMask.AsInt32());
mins.Distances = minDis;
mins.ThingIndices = minIndices;
}
}
return(mins);
}
