diff --git a/Shader/terrain.tcs b/Shader/terrain.tcs
index f1a8659..61c53bf 100644
--- a/Shader/terrain.tcs
+++ b/Shader/terrain.tcs
@@ -2,6 +2,8 @@
 
 layout(vertices = 3) out;
 
+uniform int tessellation_factor;
+
 in PipelineData {
     vec4 position;
     vec2 texture_coordinate;
@@ -16,8 +18,8 @@ void main() {
     tc_out[gl_InvocationID].texture_coordinate = tc_in[gl_InvocationID].texture_coordinate;
     tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
 
-    gl_TessLevelInner[0] = 32;
-    gl_TessLevelOuter[0] = 32;
-    gl_TessLevelOuter[1] = 32;
-    gl_TessLevelOuter[2] = 32;
+    gl_TessLevelInner[0] = tessellation_factor;
+    gl_TessLevelOuter[0] = tessellation_factor;
+    gl_TessLevelOuter[1] = tessellation_factor;
+    gl_TessLevelOuter[2] = tessellation_factor;
 }
\ No newline at end of file
diff --git a/test/full-demo/main.cpp b/test/full-demo/main.cpp
index 09f2980..6b4da05 100644
--- a/test/full-demo/main.cpp
+++ b/test/full-demo/main.cpp
@@ -16,7 +16,7 @@ class FullDemo : public Gedeng::Application {
     FullDemo(unsigned long ms_per_update, unsigned int window_size_x, unsigned int window_size_y,
              Gedeng::String window_name)
         : Application(ms_per_update, window_size_x, window_size_y, window_name), particle_interval(0.2),
-          number_of_steps(10.0), number_of_refinement_steps(10.0), bump_depth(0.1),
+          number_of_steps(10.0), number_of_refinement_steps(10.0), bump_depth(0.1), tessellation_factor(16.0),
           render_shader(Gedeng::Shader("Shader/bump.vs", "Shader/bump.fs")),
           debug_shader(Gedeng::Shader("Shader/depth-debug.vs", "Shader/depth-debug.fs")),
           camera(Gedeng::FPSCamera(90, 1920, 1080, 0.1, 1000.0)),
@@ -69,6 +69,9 @@ class FullDemo : public Gedeng::Application {
         if (Gedeng::Input::is_key_down(GLFW_KEY_2)) particle_interval = fmax(particle_interval + 0.1 * delta, 0.02);
         if (Gedeng::Input::is_key_down(GLFW_KEY_1)) particle_interval = fmax(particle_interval - 0.1 * delta, 0.02);
 
+        if (Gedeng::Input::is_key_down(GLFW_KEY_4)) tessellation_factor += delta * 8.0;
+        if (Gedeng::Input::is_key_down(GLFW_KEY_3)) tessellation_factor -= delta * 8.0;
+
         particles.set_interval(particle_interval);
     }
 
@@ -130,6 +133,7 @@ class FullDemo : public Gedeng::Application {
         heightmap.bind_to(0);
         terrain_shader.setMat4("projection", camera.get_projection());
         terrain_shader.setMat4("view", camera.get_view());
+        terrain_shader.setInt("tessellation_factor", static_cast<int>(tessellation_factor));
         terrain_mesh.render_patches(terrain_shader);
 
         // Log framerate
@@ -143,6 +147,8 @@ class FullDemo : public Gedeng::Application {
     float number_of_refinement_steps;
     float bump_depth;
 
+    float tessellation_factor;
+
     Gedeng::Shader render_shader;
     Gedeng::Shader debug_shader;
     Gedeng::Shader terrain_shader;