Upgrade demo to python 3, also closes peteanderson80#42

CMakeLists.txt

@@ -56,7 +56,7 @@ target_link_libraries(mattersim_main MatterSim)
 
 add_subdirectory(pybind11)
 
-find_package(PythonInterp 2.7)
+find_package(PythonInterp 3)
 message(${PYTHON_EXECUTABLE})
 
 # Need to search for python executable again to pick up an activated

README.md

@@ -155,11 +155,13 @@ nvidia-docker run -it -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix --mount type=b
 cd /root/mount/Matterport3DSimulator
 ```
 
+If you get an error like `Error: BadShmSeg (invalid shared segment parameter) 128` you may also need to include `-e="QT_X11_NO_MITSHM=1"` in the docker run command above.
+
 Build the simulator using any rendering option. Commands for running both python and C++ demos are provided below. These are very simple demos designed to illustrate the use of the simulator in python and C++. By default, these demos have depth rendering on. Check the code and turn it off if you haven't preprocessed the depth outputs (see Depth Outputs above). 
 
 Python demo:
 ```
-python src/driver/driver.py
+python3 src/driver/driver.py
 ```
 C++ demo:
 ```

src/driver/driver.py

@@ -1,5 +1,4 @@
-import sys
-sys.path.append('build')
+
 import MatterSim
 import time
 import math
@@ -18,7 +17,7 @@
 sim = MatterSim.Simulator()
 sim.setCameraResolution(WIDTH, HEIGHT)
 sim.setCameraVFOV(VFOV)
-sim.setDepthEnabled(True)
+sim.setDepthEnabled(False) # Turn on depth only after running ./scripts/depth_to_skybox.py (see README.md)
 sim.initialize()
 #sim.newEpisode(['2t7WUuJeko7'], ['1e6b606b44df4a6086c0f97e826d4d15'], [0], [0])
 #sim.newEpisode(['1LXtFkjw3qL'], ['0b22fa63d0f54a529c525afbf2e8bb25'], [0], [0])
@@ -29,9 +28,10 @@
 location = 0
 ANGLEDELTA = 5 * math.pi / 180
 
-print '\nPython Demo'
-print 'Use arrow keys to move the camera.'
-print 'Use number keys (not numpad) to move to nearby viewpoints indicated in the RGB view.\n'
+print('\nPython Demo')
+print('Use arrow keys to move the camera.')
+print('Use number keys (not numpad) to move to nearby viewpoints indicated in the RGB view.')
+print('Depth outputs are turned off by default - check driver.py:L20 to enable.\n')
 
 while True:
     sim.makeAction([location], [heading], [elevation])