public void AlongRay(Ray ray, List <T> results)
{
if (ray.Intersection(Aabb))
{
// check all the items that are part of this object
foreach (var item in Items)
{
if (item is IIntersectable intersectable)
{
RayHitInfo info = intersectable.GetIntersection(ray);
if (info != null && info.HitType != IntersectionType.None && info.DistanceToHit >= 0)
{
results.Add(item.Item);
}
}
else if (ray.Intersection(item.Aabb))
{
results.Add(item.Item);
}
}
nodeA?.AlongRay(ray, results);
nodeB?.AlongRay(ray, results);
}
}
public RayHitInfo GetClosestIntersection(Ray ray)
{
RayHitInfo bestIntersect = null;
if (ray.Intersection(Aabb))
{
// check all the items that are part of this object
foreach (var item in Items)
{
if (item is IIntersectable intersectable)
{
RayHitInfo info = intersectable.GetIntersection(ray);
if (info != null && info.HitType != IntersectionType.None && info.DistanceToHit >= 0)
{
if (ray.isShadowRay)
{
return(info);
}
else if (bestIntersect == null || info.DistanceToHit < bestIntersect.DistanceToHit)
{
bestIntersect = info;
ray.maxDistanceToConsider = bestIntersect.DistanceToHit;
}
}
}
// we will just be hitting the bounding box of the type
else
{
RayHitInfo info = ray.GetClosestIntersection(item.Aabb);
if (info != null && info.HitType != IntersectionType.None && info.DistanceToHit >= 0)
{
info.ClosestHitObject = item.Item;
if (ray.isShadowRay)
{
return(info);
}
else if (bestIntersect == null || info.DistanceToHit < bestIntersect.DistanceToHit)
{
bestIntersect = info;
ray.maxDistanceToConsider = bestIntersect.DistanceToHit;
}
}
}
}
var checkFirst = nodeA;
var checkSecond = nodeB;
if (ray.directionNormal[splittingPlane] < 0)
{
checkFirst = nodeB;
checkSecond = nodeA;
}
if (checkFirst != null)
{
RayHitInfo firstIntersect = checkFirst.GetClosestIntersection(ray);
if (firstIntersect != null && firstIntersect.HitType != IntersectionType.None)
{
if (ray.isShadowRay)
{
return(firstIntersect);
}
else if (bestIntersect == null || firstIntersect.DistanceToHit < bestIntersect.DistanceToHit)
{
bestIntersect = firstIntersect;
ray.maxDistanceToConsider = bestIntersect.DistanceToHit;
}
}
}
if (checkSecond != null)
{
RayHitInfo secondIntersect = checkSecond.GetClosestIntersection(ray);
if (secondIntersect != null && secondIntersect.HitType != IntersectionType.None)
{
if (ray.isShadowRay)
{
return(secondIntersect);
}
else if (bestIntersect == null || secondIntersect.DistanceToHit < bestIntersect.DistanceToHit)
{
bestIntersect = secondIntersect;
ray.maxDistanceToConsider = bestIntersect.DistanceToHit;
}
}
}
}
return(bestIntersect);
}
public IEnumerable IntersectionIterator(Ray ray)
{
if (ray.Intersection(Aabb))
{
IPrimitive checkFirst = nodeA;
IPrimitive checkSecond = nodeB;
if (ray.directionNormal[splitingPlane] < 0)
{
checkFirst = nodeB;
checkSecond = nodeA;
}
foreach (IntersectInfo info in checkFirst.IntersectionIterator(ray))
{
if (info != null && info.hitType != IntersectionType.None)
{
yield return info;
}
}
if (checkSecond != null)
{
foreach (IntersectInfo info in checkSecond.IntersectionIterator(ray))
{
if (info != null && info.hitType != IntersectionType.None)
{
yield return info;
}
}
}
}
}
public IntersectInfo GetClosestIntersection(Ray ray)
{
if (ray.Intersection(Aabb))
{
IPrimitive checkFirst = nodeA;
IPrimitive checkSecond = nodeB;
if (ray.directionNormal[splitingPlane] < 0)
{
checkFirst = nodeB;
checkSecond = nodeA;
}
IntersectInfo infoFirst = checkFirst.GetClosestIntersection(ray);
if (infoFirst != null && infoFirst.hitType != IntersectionType.None)
{
if (ray.isShadowRay)
{
return infoFirst;
}
else
{
ray.maxDistanceToConsider = infoFirst.distanceToHit;
}
}
if (checkSecond != null)
{
IntersectInfo infoSecond = checkSecond.GetClosestIntersection(ray);
if (infoSecond != null && infoSecond.hitType != IntersectionType.None)
{
if (ray.isShadowRay)
{
return infoSecond;
}
else
{
ray.maxDistanceToConsider = infoSecond.distanceToHit;
}
}
if (infoFirst != null && infoFirst.hitType != IntersectionType.None && infoFirst.distanceToHit >= 0)
{
if (infoSecond != null && infoSecond.hitType != IntersectionType.None && infoSecond.distanceToHit < infoFirst.distanceToHit && infoSecond.distanceToHit >= 0)
{
return infoSecond;
}
else
{
return infoFirst;
}
}
return infoSecond; // we don't have to test it because it didn't hit.
}
return infoFirst;
}
return null;
}