move out num points to sceneGeometry

GUI/View/Realspace/RealspaceBuilder.cpp

@@ -105,7 +105,7 @@ std::unique_ptr<const double2d_t> layerRoughnessMap(const LayerItem& layerItem,
     if (const auto* br = dynamic_cast<const BasicRoughnessItem*>(layerItem.certainRoughness())) {
         auto roughness = LayerRoughness(br->sigma().dVal(), br->hurst().dVal(),
                                         br->lateralCorrelationLength().dVal());
-        int n = 256;
+        int n = sceneGeometry.roughnessResolution;
         double L = 2 * sceneGeometry.layerSize;
         auto rmap = RoughnessMap(n, n, L, L, &roughness, seed); // seed < 0 ==> random every time
         result.reset(new double2d_t(rmap.generateMap()));

Img3D/Type/SceneGeometry.h

@@ -21,6 +21,7 @@ struct SceneGeometry {
     double layerBorderWidth = 5.0;
     double topOrBottomLayerThickness = 25.0;
     double layerMinimumThickness = 2.0;
+    unsigned roughnessResolution = 256;
     unsigned maxNumberOfParticlesToShow = 20000;
 };