diff --git a/src/basics/NoiseFunctionSimplex.cpp b/src/basics/NoiseFunctionSimplex.cpp
index fc8b4dc..4f42cae 100644
--- a/src/basics/NoiseFunctionSimplex.cpp
+++ b/src/basics/NoiseFunctionSimplex.cpp
@@ -517,14 +517,14 @@ const Texture2D *NoiseFunctionSimplex::getNormalTexture() {
                 // TODO Make texture tileable
                 double dx = to_double(x) / to_double(width);
                 double dz = to_double(z) / to_double(height);
-                double vcenter = noiseSimplexGet2DValue(scale * dx, scale * dz) - 0.5;
-                double vsouth = noiseSimplexGet2DValue(scale * dx, scale * dz + offset) - 0.5;
-                double veast = noiseSimplexGet2DValue(scale * dx + offset, scale * dz) - 0.5;
+                double vcenter = noiseSimplexGet2DValue(scale * dx, scale * dz);
+                double vsouth = noiseSimplexGet2DValue(scale * dx, scale * dz + offset);
+                double veast = noiseSimplexGet2DValue(scale * dx + offset, scale * dz);
 
                 Vector3 normal = Geometry::getNormalFromTriangle(
                     Vector3(0.0, vcenter, 0.0), Vector3(0.0, vsouth, offset), Vector3(offset, veast, 0.0));
 
-                _normalTexture->setPixel(x, z, Color(normal.x + 0.5, normal.y + 0.5, normal.z + 0.5));
+                _normalTexture->setPixel(x, z, Color(normal.x * 0.5 + 0.5, normal.y * 0.5 + 0.5, normal.z * 0.5 + 0.5));
             }
         }
     }
diff --git a/src/render/opengl/shaders/noise.frag b/src/render/opengl/shaders/noise.frag
index d466fc6..61be54f 100644
--- a/src/render/opengl/shaders/noise.frag
+++ b/src/render/opengl/shaders/noise.frag
@@ -11,7 +11,13 @@ vec3 noiseNormal2d(float[4] data, vec2 location, float detail)
     {
         // TODO offsets
         // TODO parametrized texture scaling
-        normal += texture(simplexSampler, location * scaling / 15.0).xyz - vec3(0.5);
+        float factor;
+        if (height * step_height <= detail) {
+            factor = (height - detail) / (height - height * step_height);
+        } else {
+            factor = 1.0;
+        }
+        normal += (texture(simplexSampler, location * scaling / 15.0).xyz * 2.0 - 1.0) * factor;
         scaling *= step_scaling;
         height *= step_height;
     }