The event map is very simple, first we add and connect a World start event to the camera with an action Interactivity Mouse/Keyboard navigation.

After we build 3 expression and add properties to the camera, containers object and box object.

Camera properties :

1) To get camera position we add a Sub Properties STRING to the camera translation.

2) To receive the Send Message To Host we add a property called Cam_resultat type STRING, this properties receive all messages and properties from Cult3D and send it to HTML page for javascript.

3) And after we add a property called Change_Msg type STRING, this property have a default value "," (comma), DON'T FORGET TO ADD THE COMMA !!
this property is a trick to display a blank message into HTML page until you have click an objects.

Camera expression :

1) To finish the first part of this tutorial, we build an expression called camera.

2) Give a name to this expression, and drag and drop the camera -> CamPos property + the camera -> Change_Msg property.

3) and last drag and drop the camera -> Cam_result property.

Go to part 1 - Go to part 2 - Go to part 3 - Go to part 4 - See final result