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Overlay Scene: Blender 3D Game Engine



  


 
3.  Add the item(s) to the Overlay Scene in front of the camera

Note:
For this example, I'm adding a weapon's reticle.

Camera view
3D View menu >> View >> Camera
or
NumPad 0
Position item(s)
 
  
4.  Add a sensor

Note:
For this example, I'm using an Keyboard sensor and I'm attaching the sensor/controller/actuator to the active camera.

Switch back to Main Scene.  Select Active Camera

Buttons Window menu >> Logic (F4)
Sensors
Add
Sensor Type
Keyboard
Key --  Spacebar



   
5.  Add a Controller

Note:
For this example, I'm using an AND Controller.

Buttons Window menu >> Logic (F4)
Controllers
Add
Controller Type
AND

 

  
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