X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fgeometry%2Fhyperbox.h;h=e3236e8cfaf03d69877fdfe94f7a75dc8e9f811e;hb=44bd1d1ab256d397be4e2169c4ca5efdd0569d31;hp=e45fadc12ae92d4752b523302328adeaa8df650d;hpb=7353dc087872cdb93bd57cbaf2b6f0dcc21f9a03;p=libs%2Fmath.git

diff --git a/source/geometry/hyperbox.h b/source/geometry/hyperbox.h
index e45fadc..e3236e8 100644
--- a/source/geometry/hyperbox.h
+++ b/source/geometry/hyperbox.h
@@ -29,10 +29,11 @@ public:
 	const LinAl::Vector<T, D> &get_dimensions() const { return dimensions; }
 	T get_dimension(unsigned) const;
 
-	virtual BoundingBox<T, D> get_axis_aligned_bounding_box() const;
+	virtual BoundingBox<T, D> get_axis_aligned_bounding_box(unsigned = 0) const;
 	virtual bool contains(const LinAl::Vector<T, D> &) const;
 	virtual unsigned get_max_ray_intersections() const { return 2; }
 	virtual unsigned get_intersections(const Ray<T, D> &, SurfacePoint<T, D> *, unsigned) const;
+	virtual Coverage get_coverage(const BoundingBox<T, D> &) const;
 };
 
 template<typename T, unsigned D>
@@ -64,7 +65,7 @@ inline T HyperBox<T, D>::get_dimension(unsigned i) const
 }
 
 template<typename T, unsigned D>
-inline BoundingBox<T, D> HyperBox<T, D>::get_axis_aligned_bounding_box() const
+inline BoundingBox<T, D> HyperBox<T, D>::get_axis_aligned_bounding_box(unsigned) const
 {
 	LinAl::Vector<T, D> half_dim = dimensions/T(2);
 	return BoundingBox<T, D>(-half_dim, half_dim);
@@ -112,13 +113,23 @@ inline unsigned HyperBox<T, D>::get_intersections(const Ray<T, D> &ray, SurfaceP
 			{
 				if(points)
 				{
-					points[n].position = p;
-					points[n].normal = LinAl::Vector<T, D>();
-					points[n].normal[i] = j;
-					points[n].distance = x;
-
-					if(n==1 && x<points[0].distance)
-						std::swap(points[0], points[1]);
+					bool entry = (T(j)*ray.get_direction()[i]<T(0));
+					unsigned k = 0;
+					if(n>0 && entry!=points[0].entry)
+					{
+						if(entry)
+							points[1] = points[0];
+						else
+							++k;
+					}
+					if(k<n && entry==points[k].entry)
+						--n;
+
+					points[k].position = p;
+					points[k].normal = LinAl::Vector<T, D>();
+					points[k].normal[i] = j;
+					points[k].distance = x;
+					points[k].entry = (T(j)*ray.get_direction()[i]<T(0));
 				}
 
 				++n;
@@ -129,6 +140,25 @@ inline unsigned HyperBox<T, D>::get_intersections(const Ray<T, D> &ray, SurfaceP
 	return n;
 }
 
+template<typename T, unsigned D>
+inline Coverage HyperBox<T, D>::get_coverage(const BoundingBox<T, D> &bbox) const
+{
+	const LinAl::Vector<T, D> &min_pt = bbox.get_minimum_point();
+	const LinAl::Vector<T, D> &max_pt = bbox.get_maximum_point();
+	LinAl::Vector<T, D> half_dim = dimensions/T(2);
+
+	Coverage coverage = FULL_COVERAGE;
+	for(unsigned i=0; i<D; ++i)
+	{
+		if(max_pt[i]<-half_dim[i] || min_pt[i]>half_dim[i])
+			return NO_COVERAGE;
+		if(min_pt[i]<-half_dim[i] || max_pt[i]>half_dim[i])
+			coverage = PARTIAL_COVERAGE;
+	}
+
+	return coverage;
+}
+
 } // namespace Geometry
 } // namespace Msp