message: doc/linux/build_instructions: add build instructions for pointCloud in aditof-demo
diff: @@ -77,3 +77,32 @@ make
  ## SDK with bindings
  - Please check the readme files for each type of binding in the [bindings directory](../../bindings).
  +
  +### Enabling the point cloud display in aditof-demo
  +
  + OpenCV needs to be build manually in order to visualize pointCloud data because the prebuild libraries do not come with the viz module installed.
  + The steps required for building and including the required dependencies are presented below:
  +
  + Requirements:
  + * OpenCV 4.5.0
  +
  +```console
  +sudo apt-get install libgtk-3-dev libvtk6-dev
  +git clone --branch 4.5.0 --depth 1 https://github.com/opencv/opencv.git
  +git clone --branch 4.5.0 --depth 1 https://github.com/opencv/opencv_contrib.git
  +cp -r ./opencv_contrib/modules/viz ./opencv/modules/
  +cd opencv
  +mkdir build_4_5_0 && cd build_4_5_0
  +cmake -DWITH_VTK=ON -DBUILD_opencv_viz=ON -DBUILD_opencv_world=ON -DCMAKE_PREFIX_PATH="/opt/vtk" -DCMAKE_INSTALL_PREFIX="/opt/opencv" ..
  +sudo cmake --build . --target install
  +```
  +
  +Compile the sdk and add OpenCV to CMAKE_PREFIX_PATH:
  +
  +```console
  +cd aditof_sdk
  +mkdir build
  +cd build
  +cmake -DCMAKE_PREFIX_PATH="/opt/glog;/opt/protobuf;/opt/websockets;/opt/opencv" -DWITH_EXAMPLES=on ..
  +make
  +```
  