diff --git a/ar/ex1_ar_intro/code/sketch.properties b/ar/ex1_ar_intro/code/sketch.properties
new file mode 100644
index 0000000..db8eaa0
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diff --git a/ar/ex1_ar_intro/data/grey.png b/ar/ex1_ar_intro/data/grey.png
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diff --git a/ar/ex1_ar_intro/data/materials.mtl b/ar/ex1_ar_intro/data/materials.mtl
new file mode 100644
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+f 91/410/123 103/409/123 104/408/123
+f 95/413/124 104/412/124 105/411/124
+f 108/419/125 107/418/125 99/417/125 85/416/125 86/415/125 89/414/125
+f 100/423/126 109/422/126 92/421/126 93/420/126
+f 101/427/127 98/426/127 99/425/127 107/424/127
+f 109/432/128 108/431/128 89/430/128 90/429/128 92/428/128
+f 110/435/129 108/434/129 109/433/129
+f 111/438/130 107/437/130 108/436/130
+f 112/441/131 101/440/131 107/439/131
+f 113/444/132 100/443/132 101/442/132
+f 113/447/133 109/446/133 100/445/133
+f 109/450/134 114/449/134 110/448/134
+f 113/453/135 114/452/135 109/451/135
+f 108/456/136 110/455/136 111/454/136
+f 107/459/137 111/458/137 112/457/137
+f 101/462/138 112/461/138 113/460/138
+f 113/467/139 112/466/139 111/465/139 110/464/139 114/463/139
+o group1104563999
+g mesh1104563999
+usemtl mat10
+f 118/471/140 117/470/140 116/469/140 115/468/140
+f 117/475/141 120/474/141 119/473/141 116/472/141
+f 120/479/142 118/478/142 115/477/142 119/476/142
+f 121/482/143 116/481/143 119/480/143
+f 120/485/144 117/484/144 118/483/144
+f 122/488/145 115/487/145 116/486/145
+f 122/491/146 119/490/146 115/489/146
+f 119/494/147 122/493/147 121/492/147
+f 116/497/148 121/496/148 122/495/148
diff --git a/ar/ex1_ar_intro/ex1_ar_intro.pde b/ar/ex1_ar_intro/ex1_ar_intro.pde
new file mode 100644
index 0000000..c9c23b9
--- /dev/null
+++ b/ar/ex1_ar_intro/ex1_ar_intro.pde
@@ -0,0 +1,83 @@
+import processing.ar.*;
+
+ARTracker tracker;
+ArrayList<ARAnchor> trackAnchors = new ArrayList<ARAnchor>();
+ARAnchor touchAnchor;
+PShape obj;
+
+void setup() {
+  fullScreen(AR);
+  obj = loadShape("model.obj");
+  tracker = new ARTracker(this);
+  tracker.start();
+  noStroke();  
+}
+
+void draw() {
+  lights();
+  drawObject(touchAnchor);
+  drawAnchors();
+  drawTrackables();
+}
+
+void mousePressed() {
+  if (touchAnchor != null) touchAnchor.dispose();
+  ARTrackable hit = tracker.get(mouseX, mouseY);
+  if (hit != null) touchAnchor = new ARAnchor(hit);
+  else touchAnchor = null;
+}
+
+void trackableEvent(ARTrackable t) {
+  if (trackAnchors.size() < 10 && t.isFloorPlane()) {
+    trackAnchors.add(new ARAnchor(t, 0, 0, 0));
+  }
+}
+
+void drawAnchors() {
+  for (ARAnchor anchor : trackAnchors) {
+    if (anchor.isTracking()) drawSphere(anchor, 0.05);
+    if (anchor.isStopped()) anchor.dispose();
+  }
+  tracker.clearAnchors(trackAnchors);   
+}
+
+void drawTrackables() {
+  for (int i = 0; i < tracker.count(); i++) {
+    ARTrackable t = tracker.get(i);
+    pushMatrix();
+    t.transform();
+    float lx = t.lengthX();
+    float lz = t.lengthZ();    
+    if (mousePressed && t.isSelected(mouseX, mouseY)) {
+      fill(255, 0, 0, 100);
+    } else {
+      fill(255, 100);
+    }
+    drawPlane(lx, lz);
+    popMatrix();  
+  }  
+}
+
+void drawSphere(ARAnchor anchor, float r) {
+  anchor.attach();
+  fill(#CF79F5);
+  sphere(r);
+  anchor.detach();
+}
+
+void drawPlane(float lx, float lz) {
+  beginShape(QUADS);
+  vertex(-lx/2, 0, -lz/2);
+  vertex(-lx/2, 0, +lz/2);
+  vertex(+lx/2, 0, +lz/2);
+  vertex(+lx/2, 0, -lz/2);
+  endShape();  
+}
+
+void drawObject(ARAnchor anchor) {
+  if (anchor != null) {
+    anchor.attach();
+    shape(obj);
+    anchor.detach();
+  }
+}
diff --git a/sensors/ex2_boxes/ex2_boxes.pde b/sensors/ex2_boxes/ex2_boxes.pde
index b2a5cd2..e1db644 100644
--- a/sensors/ex2_boxes/ex2_boxes.pde
+++ b/sensors/ex2_boxes/ex2_boxes.pde
@@ -30,7 +30,7 @@ void setup() {
   fullScreen(P2D);
   orientation(PORTRAIT);
   
-  context = getActivity();
+  context = getContext();
   manager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
   sensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
   listener = new AccelerometerListener();
@@ -95,4 +95,4 @@ class AccelerometerListener implements SensorEventListener {
   }
   public void onAccuracyChanged(Sensor sensor, int accuracy) {
   }
-}
\ No newline at end of file
+}
diff --git a/vr/ex3_solar_system/code/sketch.properties b/vr/ex3_solar_system/code/sketch.properties
new file mode 100644
index 0000000..0828c1e
--- /dev/null
+++ b/vr/ex3_solar_system/code/sketch.properties
@@ -0,0 +1,3 @@
+mode=Android
+component=vr
+mode.id=processing.mode.android.AndroidMode
diff --git a/vr/ex3_solar_system/data/earthlike.jpg b/vr/ex3_solar_system/data/earthlike.jpg
new file mode 100644
index 0000000..8fd33bf
Binary files /dev/null and b/vr/ex3_solar_system/data/earthlike.jpg differ
diff --git a/vr/ex3_solar_system/data/mercury.jpg b/vr/ex3_solar_system/data/mercury.jpg
new file mode 100644
index 0000000..662ddda
Binary files /dev/null and b/vr/ex3_solar_system/data/mercury.jpg differ
diff --git a/vr/ex3_solar_system/data/sol.jpg b/vr/ex3_solar_system/data/sol.jpg
new file mode 100644
index 0000000..46d7bea
Binary files /dev/null and b/vr/ex3_solar_system/data/sol.jpg differ
diff --git a/vr/ex3_solar_system/data/startfield.jpg b/vr/ex3_solar_system/data/startfield.jpg
new file mode 100644
index 0000000..08a9cdb
Binary files /dev/null and b/vr/ex3_solar_system/data/startfield.jpg differ
diff --git a/vr/ex3_solar_system/ex3_solar_system.pde b/vr/ex3_solar_system/ex3_solar_system.pde
new file mode 100644
index 0000000..216a804
--- /dev/null
+++ b/vr/ex3_solar_system/ex3_solar_system.pde
@@ -0,0 +1,114 @@
+import processing.vr.*;
+
+VRCamera cam;
+
+PShape stars;
+PShape sol;
+PShape planet1;
+PShape planet2;
+
+float orbitalAngle1;
+float orbitalAngle2;
+float rotationAngle1;
+float rotationAngle2;
+
+int followPlanet;
+PMatrix3D mat = new PMatrix3D();
+float cx, cy, cz;
+
+void setup() {
+  fullScreen(VR);
+  cameraUp();
+  
+  cam = new VRCamera(this);
+  cam.setNear(10);
+  cam.setFar(1500);
+
+  noStroke();
+  sphereDetail(40);
+
+  stars = createShape(SPHERE, 1000);
+  stars.setTexture(loadImage("startfield.jpg"));
+
+  sol = createShape(SPHERE, 100);
+  sol.setTexture(loadImage("sol.jpg"));
+
+  planet1 = createShape(SPHERE, 20);
+  planet1.setTexture(loadImage("mercury.jpg"));
+
+  planet2 = createShape(SPHERE, 50);
+  planet2.setTexture(loadImage("earthlike.jpg"));
+}
+
+void calculate() {
+  orbitalAngle1 += 0.002;
+  orbitalAngle2 += 0.001;
+  rotationAngle1 += 0.02;
+  rotationAngle2 += 0.02;
+
+  if (0 < followPlanet) {
+    float d;
+    float r;
+    float oa;
+    float ra;
+    if (followPlanet == 1) {
+      d = 300;
+      r = 20;
+      oa = orbitalAngle1;
+      ra = rotationAngle1;
+    } else {
+      d = 600;
+      r = 50;
+      oa = orbitalAngle2;
+      ra = rotationAngle2;
+    }
+
+    mat.reset();
+    mat.rotateY(oa);
+    mat.translate(d, 0, 0);
+    mat.rotateY(ra);
+    mat.translate(-2 * r, 0, 0);
+
+    cx = mat.multX(0, 0, 0);
+    cy = mat.multY(0, 0, 0);
+    cz = mat.multZ(0, 0, 0);
+  }
+}
+
+void draw() {
+  background(0);
+  shape(stars);
+
+  if (0 < followPlanet) cam.setPosition(cx, cy, cz);
+
+  shape(sol);
+  if (intersectsSphere(100, 0, 0) && mousePressed) followPlanet = 0;
+
+  pointLight(255, 255, 255, 0, 0, 0);
+
+  pushMatrix();
+  rotateY(orbitalAngle1);
+  translate(300, 0, 0);
+  rotateY(rotationAngle1);
+  if (followPlanet != 1 && intersectsSphere(2 * 20, 0, 0)) {
+    planet1.setTint(color(255, 0, 0));
+    if (mousePressed) followPlanet = 1;
+  } else {
+    planet1.setTint(color(255));
+  }
+  shape(planet1);
+  popMatrix();
+
+  pushMatrix();
+  rotateY(orbitalAngle2);
+  translate(600, 0, 0);
+  rotateY(rotationAngle2);
+  if (followPlanet != 2 && intersectsSphere(2 * 50, 0, 0)) {
+    planet2.setTint(color(255, 0, 0));
+    if (mousePressed) followPlanet = 2;
+  } else {
+    planet2.setTint(color(255));
+  }
+  shape(planet2);
+  popMatrix();
+}