diff --git a/main.cpp b/main.cpp
index 4f31365..99fa1be 100644
--- a/main.cpp
+++ b/main.cpp
@@ -459,10 +459,10 @@ public:
 
     TextBox *txt_heightmap_from_x, *txt_heightmap_from_y;
     TextBox *txt_heightmap_to_x, *txt_heightmap_to_y;
-    TextBox *txt_grid_res;
+    TextBox *txt_heightmap_res;
     TextBox *txt_clearance_height, *txt_start_probing_at, *txt_max_negative_z, *txt_final_z_height;
 
-    void save_heightmap(const grbl::heightmap& grid, std::string path) {
+    static void save_heightmap(const grbl::heightmap& grid, std::string path) {
         std::ofstream out(path);
         if (out) {
             out << "from_x:" << grid.from_x << std::endl;
@@ -477,6 +477,50 @@ public:
         }
     }
 
+    grbl::heightmap load_heightmap(std::string path) {
+        grbl::heightmap result{};
+
+        std::ifstream in_file(path);
+        if (in_file) {
+            float from_x, from_y;
+            float to_x, to_y;
+            float resolution;
+            size_t probe_location = 0;
+
+            for (std::string line; std::getline(in_file, line);) {
+                auto pieces = split_string(line, ":");
+                if (pieces[0] == "from_x") {
+                    from_x = std::stof(pieces[1]);
+                } else if (pieces[0] == "from_y") {
+                    from_y = std::stof(pieces[1]);
+                } else if (pieces[0] == "to_x") {
+                    to_x = std::stof(pieces[1]);
+                } else if (pieces[0] == "to_y") {
+                    to_y = std::stof(pieces[1]);
+                } else if (pieces[0] == "resolution") {
+                    resolution = std::stof(pieces[1]);
+                } else if (pieces[0] == "probes") {
+                    result = grbl::heightmap::from_params(from_x, from_y, to_x, to_y, resolution);
+                } else {
+                    result.vertices[probe_location].x = std::stof(pieces[0]);
+                    result.vertices[probe_location].y = std::stof(pieces[1]);
+                    result.vertices[probe_location].z = std::stof(pieces[2]);
+                    probe_location++;
+                }
+            }
+        }
+
+        return result;
+    }
+
+    void fill_heightmap_from_grid(const grbl::heightmap& grid) {
+        txt_heightmap_from_x->set_value(std::to_string(grid.from_x));
+        txt_heightmap_from_y->set_value(std::to_string(grid.from_y));
+        txt_heightmap_to_x->set_value(std::to_string(grid.to_x));
+        txt_heightmap_to_y->set_value(std::to_string(grid.to_y));
+        txt_heightmap_res->set_value(std::to_string(grid.resolution));
+    }
+
     void add_heightmap_markup() {
         heightmap_layer->add<Label>("Grid definition", "sans-bold", 20);
         auto heightmap_params_holder = heightmap_layer->add<Widget>();
@@ -511,7 +555,17 @@ public:
         btn->set_callback([&]() {
             fill_heightmap_from_model();
         });
-        grid_size_holder->add<Label>("");
+        auto btn_load_heightmap = grid_size_holder->add<Button>("Load from file");
+        btn_load_heightmap->set_callback([&]() {
+            auto path = file_dialog(
+                    {{"hmap", "Heightmap files"}
+                    }, true);
+            if (!path.empty()) {
+                heightmap_grid = load_heightmap(path);
+                fill_heightmap_from_grid(heightmap_grid);
+                renderer.update_grid(heightmap_grid);
+            }
+        });
 
         txt_heightmap_from_x->set_callback([&](const std::string& new_value) {
             update_grid();
@@ -536,10 +590,10 @@ public:
         auto grid_res_holder = heightmap_params_holder->add<Widget>();
         grid_res_holder->set_layout(new BoxLayout(nanogui::Orientation::Horizontal, Alignment::Middle, 4, 4));
         grid_res_holder->add<Label>("Grid resolution", "sans-bold", 20);
-        txt_grid_res = grid_res_holder->add<TextBox>("5");
-        txt_grid_res->set_editable(true);
-        txt_grid_res->set_fixed_width(150);
-        txt_grid_res->set_callback([&](const std::string& new_value) {
+        txt_heightmap_res = grid_res_holder->add<TextBox>("5");
+        txt_heightmap_res->set_editable(true);
+        txt_heightmap_res->set_fixed_width(150);
+        txt_heightmap_res->set_callback([&](const std::string& new_value) {
             update_grid();
             return true;
         });
@@ -599,7 +653,7 @@ public:
         auto from_y = std::stof(txt_heightmap_from_y->value());
         auto to_x = std::stof(txt_heightmap_to_x->value());
         auto to_y = std::stof(txt_heightmap_to_y->value());
-        auto res = std::stof(txt_grid_res->value());
+        auto res = std::stof(txt_heightmap_res->value());
 
         if (from_x != heightmap_grid.from_x ||
             from_y != heightmap_grid.from_y ||
diff --git a/render.cpp b/render.cpp
index 1778d3c..ab44f6c 100644
--- a/render.cpp
+++ b/render.cpp
@@ -442,7 +442,7 @@ void grbl::program_renderer::update_grid(const grbl::heightmap& grid) {
             auto p3 = grid.vertices[next];
 
             // exaggerate Z
-            auto exaggeration_factor = 1000.0f;
+            auto exaggeration_factor = 100.0f;
             p1.z *= exaggeration_factor;
             p2.z *= exaggeration_factor;
             p3.z *= exaggeration_factor;