message: More OpenCV instructions
diff: @@ -97,4 +97,10 @@ To use OpenCV with MulticopterSim, you should do the following:
  1. Un-comment the <a href="https://github.com/simondlevy/MulticopterSim/blob/master/Source/MulticopterSim/MulticopterSim.Build.cs#L20"><tt>LoadOpenCV</tt></a>
  instruction in <b>MulticopterSimBuild.cs</b>.
  -2. After building the game, copy the file <b>opencv_world340.dll</b> from the <b>ThirdParty/OpenCV/Libraries/Win64/</b> to <b>Binaries/Win64/</b>.
  +2. Write a subclass of
  +[VideoManagerOpenCV](https://github.com/simondlevy/MulticopterSim/blob/master/Source/MulticopterSim/VideoManagerOpenCV.hpp),
  +implementing the
  +[processImage](https://github.com/simondlevy/MulticopterSim/blob/master/Source/MulticopterSim/VideoManagerOpenCV.hpp#L43-L45)
  +method.
  +
  +3. After building the game, copy the file <b>opencv_world340.dll</b> from the <b>ThirdParty/OpenCV/Libraries/Win64/</b> to <b>Binaries/Win64/</b>.
  