worked on 2D/3D raytracing

adjusted BVH
improved 2D/3D BVH
new bounding volumes
new test cases
renamed some test-cases for grouping reasons
made GPC header-only using slight adjustments

geo/volume/BoundingVolumeAABB2.h

@@ -0,0 +1,36 @@
+#ifndef BOUNDINGVOLUMEAABB2_H
+#define BOUNDINGVOLUMEAABB2_H
+
+#include <vector>
+
+#include "BoundingVolume.h"
+#include "../BBox2.h"
+
+class BoundingVolumeAABB2 : public BBox2 {
+
+public:
+
+	BoundingVolumeAABB2() {;}
+
+	BoundingVolumeAABB2(const BBox2& bb) : BBox2(bb) {;}
+
+	float getVolumeSize() const  {
+		const float dx = getMax().x - getMin().x;
+		const float dy = getMax().y - getMin().y;
+		return (dx*dy);
+	}
+
+	/** construct a volume around the given point-set */
+	static BoundingVolumeAABB2 fromVertices(const std::vector<Point2>& verts) {
+		BoundingVolumeAABB2 bvs;
+		for (const Point2 p : verts) {bvs.add(p);}
+		return bvs;
+	}
+
+	static BoundingVolumeAABB2 join(const BoundingVolumeAABB2 a, const BoundingVolumeAABB2 b) {
+		return BoundingVolumeAABB2(BBox2::join(a, b));
+	}
+
+};
+
+#endif // BOUNDINGVOLUMEAABB2_H