public static Hit RayTracePrimitives(Ray ray, Hit skipHit, IEnumerable <Primitive> primitives, BVH <Primitive> Accelerator)
{
Hit hit = default;
// If we have an accelerator, filter down to only the needed primitives.
#if BVH
if (Accelerator != null)
{
IEnumerable <BoundingIntersection <Primitive> > intersections = Accelerator.IntersectLeaves(ray);
BoundingIntersection <Primitive> previous = null;
foreach (BoundingIntersection <Primitive> current in intersections)
{
if (previous != null && current.Near > previous.Far)
{
break;
}
Hit currentHit = current.Object.RayTrace(ray, skipHit);
if (currentHit != default &&
(hit == default || currentHit.Distance < hit.Distance))
{
hit = currentHit;
previous = current;
}
}
}
else
#endif
{
foreach (Primitive prim in primitives)
{
Hit currentHit = prim.RayTrace(ray, skipHit);
#if DEBUG
prim.RayTrace(ray, skipHit);
#endif
if (currentHit != default &&
(hit == default || currentHit.Distance < hit.Distance))
{
hit = currentHit;
}
}
}
return(hit);
}
