diff --git a/MainController.cpp b/MainController.cpp
index b026fe0..ce5fcd7 100644
--- a/MainController.cpp
+++ b/MainController.cpp
@@ -77,7 +77,7 @@ MainController::MainController() {
 	connect(mw, &MainWindow::onGridShowEdges, [&] (const bool show) {mw->getMapView3D()->getGridRenderer()->setShowEdges(show);} );
 
 
-	mapModel->load("../IndoorMap/maps/SHL17.xml");
+	mapModel->load("../IndoorMap/maps/SHL20.xml");
 	//mapModel->load("../IndoorMap/maps/test.xml");
 
 }
diff --git a/MainWindow.cpp b/MainWindow.cpp
index 6c5d3d3..bf074f5 100644
--- a/MainWindow.cpp
+++ b/MainWindow.cpp
@@ -27,6 +27,8 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
 
 	ui->setupUi(this);
 
+
+
 	QString css;
 	css += "QPushButton				{ border: 1px solid #000000; background-color: #ffffff; }";
 	css += "QPushButton:!enabled	{ border: 1px solid #cccccc; background-color:none; }";
@@ -35,6 +37,8 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
 
 	this->setStyleSheet(css);
 
+	layerTree = new QTreeView();
+
 	mapView2D = new MapView2D();
 	mapView3D = new MapView3D();
 
@@ -43,14 +47,52 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
 	actionWidget = new ActionWidget();
 	toolBoxWidget = new ToolBoxWidget(mapView2D);
 
-	ui->layButtons->addWidget(toolBoxWidget);
+	// toolbox
+	QDockWidget* toolBoxWidgetDock = new QDockWidget("", this); toolBoxWidgetDock->setWidget(toolBoxWidget);
+	addDockWidget(Qt::LeftDockWidgetArea, toolBoxWidgetDock);
 
-	ui->layMap->addWidget(mapView2D);
-	ui->layMap->addWidget(mapView3D);
 
-	ui->layTree->addWidget(layerParamWidget);
-	ui->layTree->addWidget(elementParamWidget);
-	ui->layTree->addWidget(actionWidget);
+	// layers
+	QDockWidget* layerTreeDock = new QDockWidget("layers", this); layerTreeDock->setWidget(layerTree);
+	addDockWidget(Qt::RightDockWidgetArea, layerTreeDock);
+
+	// layer params
+	QDockWidget* layerParamWidgetDock = new QDockWidget("layer params", this); layerParamWidgetDock->setWidget(layerParamWidget);
+	addDockWidget(Qt::RightDockWidgetArea, layerParamWidgetDock);
+
+	// element params
+	QDockWidget* elementParamWidgetDock = new QDockWidget("element params", this); elementParamWidgetDock->setWidget(elementParamWidget);
+	addDockWidget(Qt::RightDockWidgetArea, elementParamWidgetDock);
+
+	// actions
+	QDockWidget* actionWidgetDock = new QDockWidget("actions", this); actionWidgetDock->setWidget(actionWidget);
+	addDockWidget(Qt::RightDockWidgetArea, actionWidgetDock);
+
+
+
+
+	QSplitter* splitter = new QSplitter(Qt::Orientation::Vertical);
+	setCentralWidget(splitter);
+	splitter->addWidget(mapView2D);
+	splitter->addWidget(mapView3D);
+
+//	// 2D View
+//	QDockWidget* mapView2DDoc = new QDockWidget("2D", this); mapView2DDoc->setWidget(mapView2D);
+//	addDockWidget(Qt::AllDockWidgetAreas, mapView2DDoc);
+
+//	// 3D View
+//	QDockWidget* mapView3DDoc = new QDockWidget("3D", this); mapView3DDoc->setWidget(mapView3D);
+//	addDockWidget(Qt::AllDockWidgetAreas, mapView3DDoc);
+
+
+//	ui->layButtons->addWidget(toolBoxWidget);
+
+//	ui->layMap->addWidget(mapView2D);
+//	ui->layMap->addWidget(mapView3D);
+
+//	ui->layTree->addWidget(layerParamWidget);
+//	ui->layTree->addWidget(elementParamWidget);
+//	ui->layTree->addWidget(actionWidget);
 
 
 	// show mode
@@ -85,5 +127,5 @@ MainWindow::~MainWindow() {
 
 
 QTreeView* MainWindow::getTree() {
-	return ui->layerTree;
+	return layerTree;
 }
diff --git a/MainWindow.h b/MainWindow.h
index a178834..0c3f658 100644
--- a/MainWindow.h
+++ b/MainWindow.h
@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 
 #include <QMainWindow>
+
 class MapView2D;
 class MapView3D;
 class QTreeView;
@@ -44,6 +45,7 @@ signals:
 
 private:
 	Ui::MainWindow *ui;
+	QTreeView* layerTree;
 	MapView2D* mapView2D;
 	MapView3D* mapView3D;
 	ElementParamWidget* elementParamWidget;
diff --git a/MainWindow.ui b/MainWindow.ui
index 24d078d..88da9ec 100644
--- a/MainWindow.ui
+++ b/MainWindow.ui
@@ -14,28 +14,7 @@
    <string>MainWindow</string>
   </property>
   <widget class="QWidget" name="centralWidget">
-   <layout class="QGridLayout" name="gridLayout_2">
-    <item row="0" column="0">
-     <layout class="QVBoxLayout" name="layButtons"/>
-    </item>
-    <item row="0" column="1">
-     <layout class="QVBoxLayout" name="layMap"/>
-    </item>
-    <item row="0" column="2">
-     <layout class="QVBoxLayout" name="layTree">
-      <item>
-       <widget class="QTreeView" name="layerTree">
-        <property name="maximumSize">
-         <size>
-          <width>250</width>
-          <height>16777215</height>
-         </size>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </item>
-   </layout>
+   <layout class="QGridLayout" name="gridLayout_2"/>
   </widget>
   <widget class="QStatusBar" name="statusBar"/>
   <widget class="QMenuBar" name="menuBar">
diff --git a/main.cpp b/main.cpp
index 87d67c0..8ded81e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,8 @@
 #include "MainController.h"
 #include <QApplication>
 
-#include "exp.h"
-#include "ray.h"
+//#include "exp.h"
+//#include "ray.h"
 
 int main(int argc, char *argv[]) {
 
diff --git a/mapview/3DGrid/GridModel.h b/mapview/3DGrid/GridModel.h
index d149b32..e106726 100644
--- a/mapview/3DGrid/GridModel.h
+++ b/mapview/3DGrid/GridModel.h
@@ -21,7 +21,7 @@ class GridModel {
 
 private:
 
-	int gridSize_cm = 31;
+	int gridSize_cm = 20;
 	Grid<MyNode> grid;
 	Floorplan::IndoorMap* im;
 
@@ -82,7 +82,7 @@ public:
 		Listener l;
 
 		GridFactory<MyNode> fac(grid);
-		fac.build(im, true, &l);
+		fac.build(im, &l);
 
 		Importance::addImportance(grid, 0);
 		//Importance::addImportance(grid, 400);
diff --git a/mapview/elements/MV2DElementFloorUnderlay.h b/mapview/elements/MV2DElementFloorUnderlay.h
index 9dfc5ca..0c4d1a5 100644
--- a/mapview/elements/MV2DElementFloorUnderlay.h
+++ b/mapview/elements/MV2DElementFloorUnderlay.h
@@ -79,8 +79,8 @@ public:
 		float sy1 = p.s.yms(my1);
 		float sx2 = p.s.xms(mx2);
 		float sy2 = p.s.yms(my2);
-		float sw = abs(sx1-sx2);
-		float sh = abs(sy1-sy2);
+		float sw = std::abs(sx1-sx2);
+		float sh = std::abs(sy1-sy2);
 
 		bbox = BBox2();
 		bbox.add(Point2(mx1, my1));
diff --git a/mapview/elements/MV2DElementStair.h b/mapview/elements/MV2DElementStair.h
index ac6f325..8e5bccb 100644
--- a/mapview/elements/MV2DElementStair.h
+++ b/mapview/elements/MV2DElementStair.h
@@ -97,8 +97,8 @@ public:
 			QLinearGradient gradient(p.s.xms(part.start.x), p.s.yms(part.start.y),	p.s.xms(part.end.x), p.s.yms(part.end.y));
 			const float p1 = 0.1 + clamp01( part.start.z / floor->height) * 0.8;
 			const float p2 = 0.1 + clamp01( part.end.z / floor->height) * 0.8;
-			gradient.setColorAt(0, QColor(p1*255, p1*255, p1*255));
-			gradient.setColorAt(1, QColor(p2*255, p2*255, p2*255));
+			gradient.setColorAt(0, QColor(p1*255, p1*255, p1*255, 128));
+			gradient.setColorAt(1, QColor(p2*255, p2*255, p2*255, 128));
 			p.setBrush(gradient);
 			p.setPen(QColor(0,0,0,128));
 
@@ -107,6 +107,24 @@ public:
 			const std::vector<Point3> points = {quad.p1, quad.p2, quad.p3, quad.p4};
 			p.drawPolygon(points);
 
+
+			QPen pen;
+			pen.setWidth(5);
+			pen.setColor(QColor(255,0,0));
+			p.setPen(pen);
+
+			// LINT
+			if (i == 0) {
+				if (quad.p1.z != floor->getStartingZ()) {
+					p.drawLine(quad.p1, quad.p2);
+				}
+			}
+			if (i == (int) parts.size() - 1) {
+				if (quad.p3.z != floor->getEndingZ()) {
+					p.drawLine(quad.p3, quad.p4);
+				}
+			}
+
 		}
 
 		if (hasFocus()) {
diff --git a/params/ActionWidget.cpp b/params/ActionWidget.cpp
index 462199a..cc6b08d 100644
--- a/params/ActionWidget.cpp
+++ b/params/ActionWidget.cpp
@@ -3,9 +3,7 @@
 #include <QPushButton>
 #include <QHBoxLayout>
 
-ActionWidget::ActionWidget(QWidget *parent) : QGroupBox(parent) {
-
-	setTitle("actions");
+ActionWidget::ActionWidget(QWidget *parent) : QWidget(parent) {
 
 	QHBoxLayout* lay = new QHBoxLayout(this);
 
diff --git a/params/ActionWidget.h b/params/ActionWidget.h
index 4655df7..469528f 100644
--- a/params/ActionWidget.h
+++ b/params/ActionWidget.h
@@ -1,9 +1,9 @@
 #ifndef ACTIONWIDGET_H
 #define ACTIONWIDGET_H
 
-#include <QGroupBox>
+#include <QWidget>
 
-class ActionWidget : public QGroupBox {
+class ActionWidget : public QWidget {
 
 	Q_OBJECT
 
diff --git a/params/ElementParamWidget.cpp b/params/ElementParamWidget.cpp
index 2d2a329..af0279e 100644
--- a/params/ElementParamWidget.cpp
+++ b/params/ElementParamWidget.cpp
@@ -64,14 +64,14 @@ QComboBox* getOutlineMethods() {
 
 
 
-ElementParamWidget::ElementParamWidget(QWidget *parent) : QGroupBox(parent) {
+ElementParamWidget::ElementParamWidget(QWidget *parent) : QWidget(parent) {
 
 	this->lay = new QGridLayout(this);
 
 	setMinimumSize(100, 100);
 	setMaximumWidth(250);
 
-	setTitle("MapElement Parameters");
+	//setTitle("MapElement Parameters");
 	QGridLayout* lay = new QGridLayout();
 
 	// start empty
diff --git a/params/ElementParamWidget.h b/params/ElementParamWidget.h
index b31f0b7..8d756f6 100644
--- a/params/ElementParamWidget.h
+++ b/params/ElementParamWidget.h
@@ -1,7 +1,7 @@
 #ifndef PARAMWIDGET_H
 #define PARAMWIDGET_H
 
-#include <QGroupBox>
+#include <QWidget>
 #include "../mapview/model/MapModelElement.h"
 
 class QLabel;
@@ -10,7 +10,7 @@ class QLineEdit;
 class QPushButton;
 class QGridLayout;
 
-class ElementParamWidget : public QGroupBox {
+class ElementParamWidget : public QWidget {
 
 	Q_OBJECT
 
diff --git a/params/LayerParamWidget.cpp b/params/LayerParamWidget.cpp
index 3dc75bc..9cdffab 100644
--- a/params/LayerParamWidget.cpp
+++ b/params/LayerParamWidget.cpp
@@ -7,11 +7,11 @@
 #include "mapview/model/IHasName.h"
 #include "mapview/model/MMFloor.h"
 
-LayerParamWidget::LayerParamWidget(QWidget *parent) : QGroupBox(parent) {
+LayerParamWidget::LayerParamWidget(QWidget *parent) : QWidget(parent) {
 
 	setMinimumSize(100, 100);
 	setMaximumWidth(250);
-	setTitle("MapLayer Parameters");
+	//setTitle("MapLayer Parameters");
 
 	QGridLayout* lay = new QGridLayout(this);
 	int r = 0;
diff --git a/params/LayerParamWidget.h b/params/LayerParamWidget.h
index e16ba4f..a445299 100644
--- a/params/LayerParamWidget.h
+++ b/params/LayerParamWidget.h
@@ -1,7 +1,7 @@
 #ifndef LAYERPARAMWIDGET_H
 #define LAYERPARAMWIDGET_H
 
-#include <QGroupBox>
+#include <QWidget>
 
 class MapLayer;
 
@@ -9,7 +9,7 @@ class QLabel;
 class QLineEdit;
 class QComboBox;
 
-class LayerParamWidget : public QGroupBox {
+class LayerParamWidget : public QWidget {
 
 	Q_OBJECT