public IntersectInfo GetClosestIntersection(Ray ray)
{
List <IntersectInfo> allPrimary = new List <IntersectInfo>();
Ray checkFrontAndBacks = new Ray(ray);
checkFrontAndBacks.intersectionType = IntersectionType.Both;
foreach (IntersectInfo info in primary.IntersectionIterator(checkFrontAndBacks))
{
allPrimary.Add(info);
}
if (allPrimary.Count == 0)
{
// We did not hit the primary object. We are done. The subtract object does not mater.
return(null);
}
allPrimary.Sort(new CompareIntersectInfoOnDistance());
// we hit the primary object, did we hit the subtract object before (within error) hitting the primary.
List <IntersectInfo> allSubtract = new List <IntersectInfo>();
foreach (IntersectInfo info in subtract.IntersectionIterator(checkFrontAndBacks))
{
allSubtract.Add(info);
}
if (allSubtract.Count == 0)
{
// we did not hit the subtract so return the first primary
return(allPrimary[0]);
}
allSubtract.Sort(new CompareIntersectInfoOnDistance());
List <IntersectInfo> result = new List <IntersectInfo>();
IntersectInfo.Subtract(allPrimary, allSubtract, result);
if (result.Count > 0)
{
return(result[0]);
}
return(null);
}