X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fgeometry%2Fhypersphere.h;h=13e4278430b8b5e2a811974a1959d54dac8bd305;hb=44bd1d1ab256d397be4e2169c4ca5efdd0569d31;hp=e2e3102014a1f73a9cfb9411d9b90638c937f851;hpb=7353dc087872cdb93bd57cbaf2b6f0dcc21f9a03;p=libs%2Fmath.git

diff --git a/source/geometry/hypersphere.h b/source/geometry/hypersphere.h
index e2e3102..13e4278 100644
--- a/source/geometry/hypersphere.h
+++ b/source/geometry/hypersphere.h
@@ -27,10 +27,11 @@ public:
 
 	T get_radius() const { return radius; }
 
-	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>
@@ -48,7 +49,7 @@ inline HyperSphere<T, D> *HyperSphere<T, D>::clone() const
 }
 
 template<typename T, unsigned D>
-inline BoundingBox<T, D> HyperSphere<T, D>::get_axis_aligned_bounding_box() const
+inline BoundingBox<T, D> HyperSphere<T, D>::get_axis_aligned_bounding_box(unsigned) const
 {
 	LinAl::Vector<T, D> extent;
 	for(unsigned i=0; i<D; ++i)
@@ -70,7 +71,7 @@ inline unsigned HyperSphere<T, D>::get_intersections(const Ray<T, D> &ray, Surfa
 	T mid = -inner_product(ray.get_direction(), ray.get_start());
 	LinAl::Vector<T, D> nearest = ray.get_start()+ray.get_direction()*mid;
 	T offset_sq = radius*radius-inner_product(nearest, nearest);
-	if(offset_sq<0)
+	if(offset_sq<T(0))
 		return 0;
 	T offset = sqrt(offset_sq);
 
@@ -85,6 +86,7 @@ inline unsigned HyperSphere<T, D>::get_intersections(const Ray<T, D> &ray, Surfa
 				points[n].position = ray.get_start()+ray.get_direction()*x;
 				points[n].normal = normalize(points[n].position);
 				points[n].distance = x;
+				points[n].entry = (i<0);
 			}
 
 			++n;
@@ -94,6 +96,41 @@ inline unsigned HyperSphere<T, D>::get_intersections(const Ray<T, D> &ray, Surfa
 	return n;
 }
 
+template<typename T, unsigned D>
+inline Coverage HyperSphere<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> far_point;
+	for(unsigned i=0; i<D; ++i)
+		far_point[i] = std::max(std::abs(min_pt[i]), std::abs(max_pt[i]));
+
+	if(contains(far_point))
+		return FULL_COVERAGE;
+
+	unsigned spanned_dimensions = 0;
+	for(unsigned i=0; i<D; ++i)
+		if(min_pt[i]<T(0) && max_pt[i]>T(0))
+			spanned_dimensions |= 1<<i;
+
+	for(unsigned i=0; i<(1<<D); ++i)
+	{
+		if(i&spanned_dimensions)
+			continue;
+
+		LinAl::Vector<T, D> point;
+		for(unsigned j=0; j<D; ++j)
+			if(!((spanned_dimensions>>j)&1))
+				point[j] = ((i>>j)&1 ? max_pt[j] : min_pt[j]);
+
+		if(contains(point))
+			return PARTIAL_COVERAGE;
+	}
+
+	return NO_COVERAGE;
+}
+
 } // namespace Geometry
 } // namespace Msp