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/BBox3.h

@@ -103,6 +103,13 @@ public:
 		return true;
 	}
 
+	/** combine two bboxes */
+	static BBox3 join(const BBox3& bb1, const BBox3& bb2) {
+		const Point3 min( std::min(bb1.p1.x, bb2.p1.x), std::min(bb1.p1.y, bb2.p1.y), std::min(bb1.p1.z, bb2.p1.z) );
+		const Point3 max( std::max(bb1.p2.x, bb2.p2.x), std::max(bb1.p2.y, bb2.p2.y), std::max(bb1.p2.z, bb2.p2.z) );
+		return BBox3(min,max);
+	}
+
 };
 
 #endif // BBOX3_H