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/BoundingVolumeCircle2.h

@@ -0,0 +1,38 @@
+#ifndef BOUDINGVOLUMECIRCLE2_H
+#define BOUDINGVOLUMECIRCLE2_H
+
+#include <vector>
+
+#include "BoundingVolume.h"
+#include "../Circle2.h"
+
+class BoundingVolumeCircle2 : public Circle2 {
+
+public:
+
+	BoundingVolumeCircle2() {;}
+
+	BoundingVolumeCircle2(const Circle2& c) : Circle2(c) {;}
+
+	float getVolumeSize() const  {
+		return M_PI * (radius*radius);
+	}
+
+	bool intersects(const Ray2 ray) const {
+		return Circle2::intersects(ray);
+	}
+
+	/** construct a volume around the given point-set */
+	static BoundingVolumeCircle2 fromVertices(const std::vector<Point2>& verts) {
+		BoundingVolumeCircle2 bvs;
+		bvs.adjustToPointSet(verts);
+		return bvs;
+	}
+
+	static BoundingVolumeCircle2 join(const BoundingVolumeCircle2 a, const BoundingVolumeCircle2 b) {
+		return BoundingVolumeCircle2(Circle2::join(a, b));
+	}
+
+};
+
+#endif // BOUDINGVOLUMECIRCLE2_H