diff --git a/app/src/main/java/com/google/ar/core/examples/java/helloar/HelloArActivity.java b/app/src/main/java/com/google/ar/core/examples/java/helloar/HelloArActivity.java
index 9acc580..187eb79 100644
--- a/app/src/main/java/com/google/ar/core/examples/java/helloar/HelloArActivity.java
+++ b/app/src/main/java/com/google/ar/core/examples/java/helloar/HelloArActivity.java
@@ -31,23 +31,17 @@
 import com.google.ar.core.Plane;
 import com.google.ar.core.Point;
 import com.google.ar.core.Point.OrientationMode;
-import com.google.ar.core.PointCloud;
 import com.google.ar.core.Pose;
 import com.google.ar.core.Session;
 import com.google.ar.core.Trackable;
 import com.google.ar.core.TrackingState;
 import com.google.ar.core.examples.java.common.framework.RWT.RWTRenderer;
 import com.google.ar.core.examples.java.common.framework.gameMain.OvergroundActor;
-import com.google.ar.core.examples.java.common.framework.model3D.BaseObject3D;
 import com.google.ar.core.examples.java.common.framework.model3D.CollisionResult;
-import com.google.ar.core.examples.java.common.framework.model3D.ModelFactory;
-import com.google.ar.core.examples.java.common.framework.model3D.ModelFileFormatException;
 import com.google.ar.core.examples.java.common.framework.model3D.Object3D;
 import com.google.ar.core.examples.java.common.framework.model3D.Position3D;
 import com.google.ar.core.examples.java.common.framework.model3D.Quaternion3D;
 import com.google.ar.core.examples.java.common.framework.model3D.Universe;
-import com.google.ar.core.examples.java.common.framework.physics.AngularVelocity3D;
-import com.google.ar.core.examples.java.common.framework.physics.Force3D;
 import com.google.ar.core.examples.java.common.framework.physics.Ground;
 import com.google.ar.core.examples.java.common.framework.physics.PhysicalSystem;
 import com.google.ar.core.examples.java.common.framework.physics.Solid3D;
@@ -59,15 +53,15 @@
 import com.google.ar.core.examples.java.common.helpers.TapHelper;
 import com.google.ar.core.examples.java.common.helpers.TrackingStateHelper;
 import com.google.ar.core.examples.java.common.java3d.Appearance;
-import com.google.ar.core.examples.java.common.java3d.Box;
 import com.google.ar.core.examples.java.common.java3d.Material;
+import com.google.ar.core.examples.java.common.java3d.Shape3D;
 import com.google.ar.core.examples.java.common.java3d.Sphere;
-import com.google.ar.core.examples.java.common.java3d.Transform3D;
 import com.google.ar.core.examples.java.common.java3d.TransparencyAttributes;
+import com.google.ar.core.examples.java.common.java3d.TriangleArray;
+import com.google.ar.core.examples.java.common.java3d.TriangleFanArray;
 import com.google.ar.core.examples.java.common.java3d.Vector3d;
 import com.google.ar.core.examples.java.common.rendering.BackgroundRenderer;
 import com.google.ar.core.examples.java.common.rendering.ObjectRenderer;
-import com.google.ar.core.examples.java.common.rendering.ObjectRenderer.BlendMode;
 import com.google.ar.core.examples.java.common.rendering.PlaneRenderer;
 import com.google.ar.core.examples.java.common.rendering.PointCloudRenderer;
 import com.google.ar.core.exceptions.CameraNotAvailableException;
@@ -77,11 +71,9 @@
 import com.google.ar.core.exceptions.UnavailableSdkTooOldException;
 import com.google.ar.core.exceptions.UnavailableUserDeclinedInstallationException;
 import java.io.IOException;
+import java.nio.FloatBuffer;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
 
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.opengles.GL10;
@@ -100,7 +92,7 @@
   private Universe universe;
   private PhysicalSystem physicalSystem;
   private Ground ground = null;
-  private Object3D rectObj;
+  private Object3D polyObj;
 
   private boolean installRequested;
 
@@ -393,25 +385,67 @@
           placedPlane = plane;
           Appearance ap = new Appearance();
           ap.setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.BLENDED, 0.5f));
-          Box rect = new Box(1.0f, 1.0f, 1.0f, ap);
-          rectObj = new Object3D("plane", rect);
+          FloatBuffer vertices = plane.getPolygon();
+          vertices.position(0);
+          TriangleFanArray polygon = new TriangleFanArray(vertices.remaining() / 2, TriangleArray.COORDINATES, new int[]{vertices.remaining() / 2});
+          for (int i = 0; i < vertices.remaining() / 2; i++) {
+            polygon.setCoordinate(i, new float[]{vertices.get(i * 2), 0.0f, vertices.get(i * 2 + 1)});
+          }
+          polyObj = new Object3D("plane", new Shape3D(polygon, ap));
           Pose p = plane.getCenterPose();
-          rectObj.scale(plane.getExtentX() / 2.0, 0.05, plane.getExtentZ() / 2.0);
-          rectObj.apply(new Position3D(p.tx(), p.ty(), p.tz()), false);
-          rectObj.apply(new Quaternion3D((double) p.qx(), (double) p.qy(), (double) p.qz(), (double) p.qw()), false);
-          System.out.println(plane + " x:" + plane.getExtentX() + ", y:" + plane.getExtentZ());
-          ground = new Ground(rectObj);
+          polyObj.apply(new Position3D(p.tx(), p.ty(), p.tz()), false);
+          polyObj.apply(new Quaternion3D((double) p.qx(), (double) p.qy(), (double) p.qz(), (double) p.qw()), false);
+          ground = new Ground(polyObj);
           universe.place(ground);
         } else if (plane.equals(placedPlane)) {
+          Appearance ap = new Appearance();
+          ap.setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.BLENDED, 0.5f));
+          FloatBuffer vertices = plane.getPolygon();
+          vertices.position(0);
+          TriangleFanArray polygon = new TriangleFanArray(vertices.remaining() / 2, TriangleArray.COORDINATES, new int[]{vertices.remaining() / 2});
+          for (int i = 0; i < vertices.remaining() / 2; i++) {
+            polygon.setCoordinate(i, new float[]{vertices.get(i * 2), 0.0f, vertices.get(i * 2 + 1)});
+          }
+          polyObj = new Object3D("plane", new Shape3D(polygon, ap));
           Pose p = plane.getCenterPose();
-          rectObj.scale(plane.getExtentX() / 2.0, 0.05, plane.getExtentZ() / 2.0);
-          rectObj.apply(new Position3D(p.tx(), p.ty(), p.tz()), false);
-          rectObj.apply(new Quaternion3D((double) p.qx(), (double) p.qy(), (double) p.qz(), (double) p.qw()), false);
-          System.out.println(plane + " x:" + plane.getExtentX() + ", y:" + plane.getExtentZ());
-          ground.updateBody(rectObj);
+          polyObj.apply(new Position3D(p.tx(), p.ty(), p.tz()), false);
+          polyObj.apply(new Quaternion3D((double) p.qx(), (double) p.qy(), (double) p.qz(), (double) p.qw()), false);
+          universe.displace(ground);
+          ground = new Ground(polyObj);
+          universe.place(ground);
         }
       }
 
+/////////////////////////////////////////////////////////////////////////////////////
+// 以下は複数検出面に対応したコードだが、検出面が2個以上になるとちゃんと動かない?
+//
+//      Collection<Plane> updatedPlanes = frame.getUpdatedTrackables(Plane.class);
+//      if (updatedPlanes != null && updatedPlanes.size() > 0) {
+//        if (ground != null) universe.displace(ground);
+//        Object3D polygons[] = new Object3D[updatedPlanes.size()];
+//        int i = 0;
+//        for (Plane plane : updatedPlanes) {
+//          Appearance ap = new Appearance();
+//          ap.setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.BLENDED, 0.5f));
+//          FloatBuffer vertices = plane.getPolygon();
+//          vertices.position(0);
+//          TriangleFanArray polygon = new TriangleFanArray(vertices.remaining() / 2, TriangleArray.COORDINATES, new int[]{vertices.remaining() / 2});
+//          for (int j = 0; j < vertices.remaining() / 2; j++) {
+//            polygon.setCoordinate(j, new float[]{vertices.get(j * 2), 0.0f, vertices.get(j * 2 + 1)});
+//          }
+//          Object3D polyObj = new Object3D("plane" + i, new Shape3D(polygon, ap));
+//          Pose p = plane.getCenterPose();
+//          polyObj.apply(new Position3D(p.tx(), p.ty(), p.tz()), false);
+//          polyObj.apply(new Quaternion3D((double) p.qx(), (double) p.qy(), (double) p.qz(), (double) p.qw()), false);
+//          polygons[i] = polyObj;
+//          i++;
+//        }
+//        ground = new Ground(new Object3D("ground", polygons));
+//        universe.place(ground);
+//      }
+/////////////////////////////////////////////////////////////////////////////////////
+
+
 //      planeRenderer.drawPlanes(
 //          session.getAllTrackables(Plane.class), camera.getDisplayOrientedPose(), projmtx);
 //