diff --git a/subt/docker/robotika/Dockerfile b/subt/docker/robotika/Dockerfile
index 1a0a0a274..ec1543101 100644
--- a/subt/docker/robotika/Dockerfile
+++ b/subt/docker/robotika/Dockerfile
@@ -29,3 +29,5 @@ ENV ROSCONSOLE_FORMAT='${time} ${severity} ${node} ${logger}: ${message}'
 
 RUN ln -s /osgar-ws/src/osgar/subt/docker/robotika/Makefile .
 RUN ln -s /osgar-ws/src/osgar/subt/docker/robotika/run_solution.bash .
+
+RUN pip install -i https://osgar.robotika.cz/subt/pip/ octomap-python==1.8.0.post12
diff --git a/subt/octomap-example.py b/subt/octomap-example.py
new file mode 100644
index 000000000..85c597347
--- /dev/null
+++ b/subt/octomap-example.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python
+
+import glooey
+import imgviz
+import numpy as np
+import pyglet
+import trimesh
+import trimesh.transformations as tf
+import trimesh.viewer
+
+import octomap
+
+
+def pointcloud_from_depth(depth, fx, fy, cx, cy):
+    assert depth.dtype.kind == 'f', 'depth must be float and have meter values'
+
+    rows, cols = depth.shape
+    c, r = np.meshgrid(np.arange(cols), np.arange(rows), sparse=True)
+    valid = ~np.isnan(depth)
+    z = np.where(valid, depth, np.nan)
+    x = np.where(valid, z * (c - cx) / fx, np.nan)
+    y = np.where(valid, z * (r - cy) / fy, np.nan)
+    pc = np.dstack((x, y, z))
+
+    return pc
+
+
+def labeled_scene_widget(scene, label):
+    vbox = glooey.VBox()
+    vbox.add(glooey.Label(text=label, color=(255, 255, 255)), size=0)
+    vbox.add(trimesh.viewer.SceneWidget(scene))
+    return vbox
+
+
+def visualize(
+    occupied, empty, K, width, height, rgb, pcd, mask, resolution, aabb
+):
+    window = pyglet.window.Window(
+        width=int(640 * 0.9 * 3), height=int(480 * 0.9)
+    )
+
+    @window.event
+    def on_key_press(symbol, modifiers):
+        if modifiers == 0:
+            if symbol == pyglet.window.key.Q:
+                window.on_close()
+
+    gui = glooey.Gui(window)
+    hbox = glooey.HBox()
+    hbox.set_padding(5)
+
+    camera = trimesh.scene.Camera(
+        resolution=(width, height), focal=(K[0, 0], K[1, 1])
+    )
+    camera_marker = trimesh.creation.camera_marker(camera, marker_height=0.1)
+
+    # initial camera pose
+    camera_transform = np.array(
+        [
+            [0.73256052, -0.28776419, 0.6168848, 0.66972396],
+            [-0.26470017, -0.95534823, -0.13131483, -0.12390466],
+            [0.62712751, -0.06709345, -0.77602162, -0.28781298],
+            [0.0, 0.0, 0.0, 1.0],
+        ],
+    )
+
+    aabb_min, aabb_max = aabb
+    bbox = trimesh.path.creation.box_outline(
+        aabb_max - aabb_min,
+        tf.translation_matrix((aabb_min + aabb_max) / 2),
+    )
+
+    geom = trimesh.PointCloud(vertices=pcd[mask], colors=rgb[mask])
+    scene = trimesh.Scene(camera=camera, geometry=[bbox, geom, camera_marker])
+    scene.camera_transform = camera_transform
+    hbox.add(labeled_scene_widget(scene, label='pointcloud'))
+
+    geom = trimesh.voxel.ops.multibox(
+        occupied, pitch=resolution, colors=[1.0, 0, 0, 0.5]
+    )
+    scene = trimesh.Scene(camera=camera, geometry=[bbox, geom, camera_marker])
+    scene.camera_transform = camera_transform
+    hbox.add(labeled_scene_widget(scene, label='occupied'))
+
+    geom = trimesh.voxel.ops.multibox(
+        empty, pitch=resolution, colors=[0.5, 0.5, 0.5, 0.5]
+    )
+    scene = trimesh.Scene(camera=camera, geometry=[bbox, geom, camera_marker])
+    scene.camera_transform = camera_transform
+    hbox.add(labeled_scene_widget(scene, label='empty'))
+
+    gui.add(hbox)
+    pyglet.app.run()
+
+
+def main():
+    data = imgviz.data.arc2017()
+    camera_info = data['camera_info']
+    K = np.array(camera_info['K']).reshape(3, 3)
+    rgb = data['rgb']
+    pcd = pointcloud_from_depth(
+        data['depth'], fx=K[0, 0], fy=K[1, 1], cx=K[0, 2], cy=K[1, 2]
+    )
+
+    nonnan = ~np.isnan(pcd).any(axis=2)
+    mask = np.less(pcd[:, :, 2], 2)
+
+    resolution = 0.01
+    octree = octomap.OcTree(resolution)
+    octree.insertPointCloud(
+        pointcloud=pcd[nonnan],
+        origin=np.array([0, 0, 0], dtype=float),
+        maxrange=2,
+    )
+    occupied, empty = octree.extractPointCloud()
+
+    aabb_min = octree.getMetricMin()
+    aabb_max = octree.getMetricMax()
+
+    visualize(
+        occupied=occupied,
+        empty=empty,
+        K=K,
+        width=camera_info['width'],
+        height=camera_info['height'],
+        rgb=rgb,
+        pcd=pcd,
+        mask=mask,
+        resolution=resolution,
+        aabb=(aabb_min, aabb_max),
+    )
+
+
+if __name__ == '__main__':
+    main()