Added samples

sample/testInterpolate.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include "interpolate3d.hpp"
+
+using namespace std;
+using namespace CosmoTool;
+
+int main()
+{
+   VectorField<float,2> *vectors = new VectorField<float,2>[8];
+
+   for (int i = 0; i < 2; i++)
+     for (int j = 0; j < 2; j++)
+       for (int k = 0; k < 2; k++)
+         {
+            int idx = i + 2*(j + 2*k);
+            vectors[idx].vec[0] = i;
+            vectors[idx].vec[1] = j;
+         }
+
+   GridSampler<VectorField<float,2> > sampler(vectors, 2, 2, 2, 2);
+   Interpolate3D<GridSampler<VectorField<float,2> > > inter(sampler);
+
+   VectorField<float,2> v = inter.get(0.5,0.5,0.5);
+   VectorField<float,2> v2 = inter.get(1.5,1.5,1.5);
+
+   cout << v.vec[0] << " " << v.vec[1] << endl;
+   cout << v2.vec[0] << " " << v2.vec[1] << endl;
+
+   return 0;
+}