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/Sphere3.h

@@ -1,5 +1,5 @@
-#ifndef SPHERE3_H
-#define SPHERE3_H
+#ifndef GEO_SPHERE3_H
+#define GEO_SPHERE3_H
 
 #include "Point3.h"
 #include "Ray3.h"
@@ -172,7 +172,7 @@ public:
 
 		// center is within both ends, so is the radius
 		Point3 newCen = (out1 + out2) / 2;
-		float newRad = out1.getDistance(out2) / 2 * 1.001;	// slightly larger to prevent rounding issues
+		float newRad = out1.getDistance(out2) / 2 * 1.0001;	// slightly larger to prevent rounding issues
 		Sphere3 res(newCen, newRad);
 
 		// check
@@ -185,4 +185,4 @@ public:
 
 };
 
-#endif // SPHERE3_H
+#endif // GEO_SPHERE3_H