X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fgeometry%2Fshape.h;h=074c11b7289665fa88786aa43b5a4343c06e0741;hb=44bd1d1ab256d397be4e2169c4ca5efdd0569d31;hp=7b1d190b5a762b82c7213a012e58190c7ba8d66c;hpb=313e10c1dcf5504789cc145166aece93d8141212;p=libs%2Fmath.git

diff --git a/source/geometry/shape.h b/source/geometry/shape.h
index 7b1d190..074c11b 100644
--- a/source/geometry/shape.h
+++ b/source/geometry/shape.h
@@ -1,20 +1,22 @@
 #ifndef MSP_GEOMETRY_SHAPE_H_
 #define MSP_GEOMETRY_SHAPE_H_
 
+#include <list>
 #include <vector>
 #include <msp/linal/vector.h>
+#include "boundingbox.h"
+#include "ray.h"
+#include "surfacepoint.h"
 
 namespace Msp {
 namespace Geometry {
 
-template<typename T, unsigned D>
-class HyperBox;
-
-template<typename T, unsigned D>
-class Ray;
-
-template<typename T, unsigned D>
-class SurfacePoint;
+enum Coverage
+{
+	NO_COVERAGE,
+	PARTIAL_COVERAGE,
+	FULL_COVERAGE
+};
 
 /**
 Base class and interface for geometric shapes.  Shapes may be bounded or
@@ -25,20 +27,95 @@ template<typename T, unsigned D>
 class Shape
 {
 protected:
+	struct CoverageCell
+	{
+		unsigned level;
+		BoundingBox<T, D> bounding_box;
+		Coverage coverage;
+	};
+
 	Shape() { }
 public:
 	virtual ~Shape() { }
 
 	virtual Shape *clone() const = 0;
 
-	virtual HyperBox<T, D> get_axis_aligned_bounding_box() const = 0;
+	virtual BoundingBox<T, D> get_axis_aligned_bounding_box(unsigned detail = 0) const = 0;
+protected:
+	BoundingBox<T, D> bisect_axis_aligned_bounding_box(unsigned) const;
+public:
 	virtual bool contains(const LinAl::Vector<T, D> &) const = 0;
 	bool check_intersection(const Ray<T, D> &) const;
 	virtual unsigned get_max_ray_intersections() const = 0;
 	virtual unsigned get_intersections(const Ray<T, D> &, SurfacePoint<T, D> *, unsigned) const = 0;
 	std::vector<SurfacePoint<T, D> > get_intersections(const Ray<T, D> &) const;
+	virtual Coverage get_coverage(const BoundingBox<T, D> &) const = 0;
 };
 
+template<typename T, unsigned D>
+inline BoundingBox<T, D> Shape<T, D>::bisect_axis_aligned_bounding_box(unsigned detail) const
+{
+	if(!detail)
+		throw std::invalid_argument("Shape::bisect_axis_aligned_bounding_box");
+
+	std::list<CoverageCell> queue;
+	queue.push_back(CoverageCell());
+	CoverageCell &root = queue.front();
+	root.level = 0;
+	root.bounding_box = get_axis_aligned_bounding_box();
+	if(root.bounding_box.is_space())
+		return root.bounding_box;
+
+	root.coverage = get_coverage(root.bounding_box);
+	if(root.coverage==FULL_COVERAGE)
+		return root.bounding_box;
+
+	LinAl::Vector<T, D> tight_min_pt = root.bounding_box.get_maximum_point();
+	LinAl::Vector<T, D> tight_max_pt = root.bounding_box.get_minimum_point();
+
+	while(!queue.empty())
+	{
+		CoverageCell &cell = queue.front();
+
+		const LinAl::Vector<T, D> &min_pt = cell.bounding_box.get_minimum_point();
+		const LinAl::Vector<T, D> &max_pt = cell.bounding_box.get_maximum_point();
+		LinAl::Vector<T, D> center = (min_pt+max_pt)/T(2);
+
+		for(unsigned i=0; i<(1<<D); ++i)
+		{
+			CoverageCell child;
+			child.level = cell.level+1;
+
+			LinAl::Vector<T, D> child_min_pt = min_pt;
+			LinAl::Vector<T, D> child_max_pt = max_pt;
+			for(unsigned j=0; j<D; ++j)
+			{
+				if((i>>j)&1)
+					child_min_pt[j] = center[j];
+				else
+					child_max_pt[j] = center[j];
+			}
+			child.bounding_box = BoundingBox<T, D>(child_min_pt, child_max_pt);
+
+			child.coverage = get_coverage(child.bounding_box);
+			if(child.coverage==FULL_COVERAGE || (child.level==detail && child.coverage!=NO_COVERAGE))
+			{
+				for(unsigned j=0; j<D; ++j)
+				{
+					tight_min_pt[j] = std::min(tight_min_pt[j], child_min_pt[j]);
+					tight_max_pt[j] = std::max(tight_max_pt[j], child_max_pt[j]);
+				}
+			}
+			else if(child.coverage==PARTIAL_COVERAGE)
+				queue.push_back(child);
+		}
+
+		queue.pop_front();
+	}
+
+	return BoundingBox<T, D>(tight_min_pt, tight_max_pt);
+}
+
 template<typename T, unsigned D>
 inline bool Shape<T, D>::check_intersection(const Ray<T, D> &ray) const
 {