Intersection intersect(Ray r, double prevBestDistance)

Performs a ray - scene intersection.

Iterates over all primitives and calls their intersect. Will only return hit points which are closer than the specified prevBestDistance.

Source 

Intersection intersect(Ray r, double prevBestDistance) {

  double bestDistance = prevBestDistance;
  Primitive bestPrimitive = null;

  //print('Finding intersetion with ${nonIdxPrimitives.length} primitives..');

  // iterate over non-indexable primitives
  for (Primitive p in this.nonIdxPrimitives) {
    var curHit = p.intersect(r, bestDistance);

    // check if we have a better hit
    if (curHit.distance < bestDistance && curHit.distance > EPS) {
      // yep.
      bestDistance = curHit.distance;
      bestPrimitive = p;
    }
  }

  // TODO iterate over indexable primitives

  // package everything nicely
  Intersection bestHit = new Intersection(bestDistance, bestPrimitive, r.getPoint3(bestDistance));
  return bestHit;
}