diff --git a/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark.cpp b/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark.cpp
index efa101633ab..3b7c02b2790 100644
--- a/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark.cpp
+++ b/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark.cpp
@@ -74,10 +74,29 @@ struct IWPValue {
     }
 };
 
+template <class GeomTraits>
+struct IWPGradient {
+    typedef typename GeomTraits::FT FT;
+    typedef typename GeomTraits::Vector_3 Vector;
+
+    Vector operator()(const typename GeomTraits::Point_3& point) const {
+        const FT alpha = 5.01;
+        // const float alpha = 1.01;
+        const FT x = alpha * (point.x() + 1) * M_PI;
+        const FT y = alpha * (point.y() + 1) * M_PI;
+        const FT z = alpha * (point.z() + 1) * M_PI;
+
+        const FT gx = M_PI * alpha * sin(x) * (cos(y) * (cos(z) - 1.0) - cos(z));
+        const FT gy = M_PI * alpha * sin(y) * (cos(x) * (cos(z) - 1.0) - cos(z));
+        const FT gz = M_PI * alpha * sin(z) * (cos(x) * (cos(y) - 1.0) - cos(y));
+        return Vector(gx, gy, gz);
+    }
+};
+
 template <class GeomTraits>
 struct Implicit_iwp {
 
-    typedef CGAL::Isosurfacing::Implicit_domain<GeomTraits, IWPValue<GeomTraits>, SphereGradient<GeomTraits>> Domain;
+    typedef CGAL::Isosurfacing::Implicit_domain<GeomTraits, IWPValue<GeomTraits>, IWPGradient<GeomTraits>> Domain;
     typedef typename GeomTraits::Vector_3 Vector;
 
     Implicit_iwp(const std::size_t N) : res(2.0 / N, 2.0 / N, 2.0 / N) {}
@@ -92,7 +111,7 @@ struct Implicit_iwp {
 
 private:
     IWPValue<GeomTraits> val;
-    SphereGradient<GeomTraits> grad;
+    IWPGradient<GeomTraits> grad;
     Vector res;
 };
 
diff --git a/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark_threads.py b/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark_threads.py
index bd6c0e83750..feecb1988cb 100644
--- a/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark_threads.py
+++ b/Isosurfacing_3/benchmark/Isosurfacing_3/benchmark_threads.py
@@ -6,14 +6,15 @@ algorithm = "ALGO_MARCHING_CUBES"
 tag = "TAG_PARALLEL"
 min_threads = 1
 max_threads = 12
-cells = 300
+n = 300
+cells = n ** 3
 
 build(scenario, kernel, algorithm, tag)
 
 data = []
 
 for t in range(min_threads, max_threads):
-	time = execute(cells, t)
+	time = execute(n, t)
 
 	data.append([scenario, kernel, algorithm, tag, t, cells, time])
 
diff --git a/Isosurfacing_3/benchmark/Isosurfacing_3/graphs.py b/Isosurfacing_3/benchmark/Isosurfacing_3/graphs.py
index 725919c181e..b19e961f231 100644
--- a/Isosurfacing_3/benchmark/Isosurfacing_3/graphs.py
+++ b/Isosurfacing_3/benchmark/Isosurfacing_3/graphs.py
@@ -44,20 +44,26 @@ if latex_export:
     plt.rcParams['font.size'] = "17"
 
 
-data = pd.read_csv("threads_implicit.csv")
-add_threads_graph(data, "implicit")
+data = pd.read_csv("implicit_iwp_mc.csv")
+add_threads_graph(data, "mc")
 
-data = pd.read_csv("threads_grid.csv")
-add_threads_graph(data, "grid")
+#data = pd.read_csv("threads_grid.csv")
+#add_threads_graph(data, "grid")
 
-plt.xticks(np.arange(1, max(data["threads"]) + 0.1, 1))
+xt = np.arange(0, min(max(data["threads"]), 9) + 0.1, 2)
+if max(data["threads"]) > 10:
+    print("more")
+    xt = np.concatenate((xt, np.arange(10, max(data["threads"]) + 0.1, 2)))
+
+print(xt)
+plt.xticks(xt)
 plot_graph("perf_threads.svg", "", False, "performance [10^3 cubes/s]", "cores")
 
 
-data = pd.read_csv("size_implicit.csv")
-add_size_graph(data, "implicit")
-
-data = pd.read_csv("size_grid.csv")
-add_size_graph(data, "grid")
-
-plot_graph("perf_size.svg", "", True, "performance [10^3 cubes/s]", "cubes")
+#data = pd.read_csv("size_implicit.csv")
+#add_size_graph(data, "implicit")
+#
+#data = pd.read_csv("size_grid.csv")
+#add_size_graph(data, "grid")
+#
+#plot_graph("perf_size.svg", "", True, "performance [10^3 cubes/s]", "cubes")